Biology Chapter: Nervous & Endocrine Systems

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Questions and Answers

Which of the following are the main components that the peripheral nervous system (PNS) is composed of?

  • Sympathetic and Parasympathetic Nervous Systems
  • Cranial and Spinal Nerves (correct)
  • Brain and Spinal Cord
  • Sensory and Motor Neurons (correct)

If a person experiences a sudden increase in their blood pH, what will happen within the body to counteract this change in pH?

  • The body will release less carbon dioxide, decreasing acidity.
  • The body will release less oxygen, increasing acidity.
  • The body will release more carbon dioxide, increasing acidity. (correct)
  • The body will release more oxygen, decreasing acidity.

What is the primary function of melanin in the skin?

  • Production of sweat to cool the body.
  • Providing structural integrity to the skin.
  • Protection from ultraviolet radiation. (correct)
  • Secretion of oil to lubricate the skin.

Which of the following is the primary waste product excreted by the sweat glands that is produced from the breakdown of proteins and the buildup of ammonia?

<p>Urea, which is formed in the liver. (B)</p> Signup and view all the answers

Which of the following is NOT a part of the central nervous system (CNS)?

<p>Cranial Nerves (D)</p> Signup and view all the answers

Which of the following best describes the role of the autonomic nervous system?

<p>Regulates involuntary bodily functions such as heart rate and digestion. (C)</p> Signup and view all the answers

Which of the following is a primary function of the somatic nervous system?

<p>Controlling voluntary movements of skeletal muscles. (B)</p> Signup and view all the answers

Which of these is the correct pairing of the nervous system components and their functions?

<p>Autonomic Nervous System: Regulates involuntary functions, Somatic Nervous System: Controls voluntary movements. (C)</p> Signup and view all the answers

What type of bond is primarily responsible for the stability of nitrogen gas (N2)?

<p>Triple covalent bonds (B)</p> Signup and view all the answers

Which enzyme, encoded by the AIDS virus, facilitates the conversion of viral RNA into DNA?

<p>Reverse transcriptase (D)</p> Signup and view all the answers

What macromolecule forms the structural framework of a cell's cytoskeleton?

<p>Proteins (D)</p> Signup and view all the answers

How many protons are present in a lithium atom, given an atomic number of 3 and a mass number of 7?

<p>3 (A)</p> Signup and view all the answers

If a segment of a DNA strand has the sequence 5' AGCTAGCGT 3', what would the sequence of its complementary strand be?

<p>3' TCGATCGCA 5' (D)</p> Signup and view all the answers

Which property of water is primarily responsible for its ability to dissolve certain substances?

<p>Polarity (A)</p> Signup and view all the answers

What is the primary effect of using a catalyst in a chemical reaction?

<p>Reaction acceleration and completion time (D)</p> Signup and view all the answers

Which type of cell is responsible for producing and releasing antibodies?

<p>Plasma B cells (C)</p> Signup and view all the answers

What type of bond is responsible for the attraction between water molecules, giving water its unique properties?

<p>Hydrogen bonds (B)</p> Signup and view all the answers

Which of the following is NOT a characteristic of enzymes?

<p>They provide energy to activate a reaction (B)</p> Signup and view all the answers

Which of these is a type of nucleic acid involved in protein synthesis?

<p>Both DNA and RNA (D)</p> Signup and view all the answers

Which molecule is the primary energy currency of cells?

<p>ATP (C)</p> Signup and view all the answers

What type of bond holds amino acids together to form proteins?

<p>Peptide bonds (A)</p> Signup and view all the answers

Which process converts light energy into chemical energy in plants?

<p>Photosynthesis (B)</p> Signup and view all the answers

Which of the following is a characteristic of prokaryotic cells?

<p>Presence of a cell wall (A)</p> Signup and view all the answers

Which of the following is NOT a component of the cell membrane?

<p>Nucleic acids (C)</p> Signup and view all the answers

What is the role of cytokines in the immune response?

<p>They directly activate other immune cells. (A)</p> Signup and view all the answers

Which cell type is primarily responsible for bone formation?

<p>Osteoblasts (B)</p> Signup and view all the answers

What is the primary function of the control group in an experiment?

<p>To provide a standard of comparison for the experimental group. (A)</p> Signup and view all the answers

Which of the following blood vessels carries deoxygenated blood from the body to the heart?

<p>Superior vena cava (A)</p> Signup and view all the answers

What type of cell has the potential to develop into any cell type in the body?

<p>Totipotent (D)</p> Signup and view all the answers

What is the relationship between genes and DNA sequence?

<p>Genes are segments of DNA that carry specific genetic information. (C)</p> Signup and view all the answers

In the experiment involving coffee filters and terminal velocity, what is the independent variable?

<p>The number of coffee filters (D)</p> Signup and view all the answers

Which of the following is NOT covered by the pleura?

<p>Heart (B), Liver (D)</p> Signup and view all the answers

What point on a phase diagram depicts the coexistence of solid, liquid, and gaseous states of a substance?

<p>Triple Point (C)</p> Signup and view all the answers

What is the main reason chloride ions have a negative charge?

<p>They gained an electron. (A)</p> Signup and view all the answers

Which of the following accurately describes the relationship between osteoblast and osteoclast activity in osteoporosis?

<p>Osteoblast activity decreases, while osteoclast activity remains normal. (A)</p> Signup and view all the answers

In a cross between a heterozygous red-flowered plant (Rr) and a white-flowered plant (rr), what is the expected phenotypic ratio in the offspring?

<p>2 red : 2 white (A)</p> Signup and view all the answers

If a cross results in all offspring having smooth leaves, what can be concluded about the parental genotypes?

<p>Both parents must have the recessive allele for smooth leaves. (A)</p> Signup and view all the answers

Which statement accurately describes the relationship between pH values and acidity?

<p>A pH of 3 is 10 times more acidic than a pH of 4. (B)</p> Signup and view all the answers

The release of anti-diuretic hormone (ADH) primarily results in which physiological response?

<p>Increased water reabsorption in the collecting duct (C)</p> Signup and view all the answers

What is the primary reason new scientific findings are published?

<p>Allowing other scientists to validate or disprove the findings (C)</p> Signup and view all the answers

Which of the following accurately describes a change that happens when a solid transitions into a liquid?

<p>Particles become less ordered (C)</p> Signup and view all the answers

What is the primary function of urea in the body?

<p>To eliminate nitrogenous wastes from the body (D)</p> Signup and view all the answers

What is the relationship between the visceral pleura and parietal pleura?

<p>The visceral pleura is the inner layer, and the parietal pleura is the outer layer. (D)</p> Signup and view all the answers

Which of the following accurately describes the critical temperature?

<p>The highest temperature at which a liquid phase can form (D)</p> Signup and view all the answers

When a plant heterozygous for red flowers (Rr) is crossed with a white-flowered plant (rr), which of the following offspring genotypes are possible?

<p>Rr, rr (C)</p> Signup and view all the answers

Which of the following has the highest hydrogen ion concentration?

<p>A substance with a pH of 2 (D)</p> Signup and view all the answers

What is the primary function of the collecting duct in the kidney?

<p>Reabsorbing water and electrolytes (C)</p> Signup and view all the answers

Which of the following is NOT a crucial aspect of the peer review process in scientific publishing?

<p>Preventing other scientists from conducting similar experiments (B)</p> Signup and view all the answers

Which of the following accurately describes the difference between the critical point and the triple point?

<p>The critical point is the point at which a gas and liquid phase are indistinguishable, while the triple point is the point at which all three phases coexist. (A)</p> Signup and view all the answers

Why is the release of anti-diuretic hormone often triggered by dehydration?

<p>ADH causes the body to conserve water, increasing blood volume and pressure (A)</p> Signup and view all the answers

What is the primary function of the centrosome in animal cells?

<p>Microtubule organization (D)</p> Signup and view all the answers

Which of the following organic molecules is characterized by containing both an amine group and a carboxyl group?

<p>Proteins (A)</p> Signup and view all the answers

Which endocrine gland is responsible for synthesizing antidiuretic hormone (ADH)?

<p>Hypothalamus (A)</p> Signup and view all the answers

Which ion binds to the troponin complex, initiating muscle contraction?

<p>Calcium (D)</p> Signup and view all the answers

Which of the following microorganisms is characterized by a lack of its own metabolic pathways and can only reproduce inside a host cell?

<p>Viruses (B)</p> Signup and view all the answers

The movement of water through aquaporins embedded in the plasma membrane of a cell in a hypertonic solution is best described as which of the following?

<p>Osmosis (D)</p> Signup and view all the answers

Considering the recent discovery that worm infection can relieve certain autoimmune disorders, how should the hypothesis regarding parasitic infections be modified?

<p>Worm infection reduces certain autoimmune disorders. (B)</p> Signup and view all the answers

In a plant where fuzzy leaves (F) are dominant over smooth leaves (f), which of the following crosses will produce only offspring with smooth leaves?

<p>ff by ff (A)</p> Signup and view all the answers

During which phase of mitosis do chromosomes align at the equator of the cell?

<p>Metaphase (B)</p> Signup and view all the answers

What is the main function of the Golgi apparatus in a eukaryotic cell?

<p>Packaging and modification of proteins (A)</p> Signup and view all the answers

Which type of bond is responsible for linking amino acids together to form a polypeptide chain?

<p>Peptide bonds (B)</p> Signup and view all the answers

Which of the following is an example of a polysaccharide that serves as an energy storage molecule in plants?

<p>Starch (C)</p> Signup and view all the answers

Which of the following is an example of a process that requires active transport?

<p>Movement of glucose across the cell membrane from an area of low concentration to high concentration (D)</p> Signup and view all the answers

What is the term for the process by which cells engulf large particles or other cells?

<p>Phagocytosis (C)</p> Signup and view all the answers

What happens to a chlorine atom when it becomes a chloride ion?

<p>It gained an electron. (D)</p> Signup and view all the answers

What property of soap allows it to effectively wash dirt off hands with water?

<p>Soap's dual polar and nonpolar nature helps bond oil and water. (B)</p> Signup and view all the answers

Which organ is primarily responsible for filtering blood and removing germs?

<p>Spleen (D)</p> Signup and view all the answers

Galactose and glucose, resulting from lactose breakdown, are classified as what?

<p>Monosaccharides (A)</p> Signup and view all the answers

Which structure facilitates the rotation of the skull on the neck?

<p>Atlas (D)</p> Signup and view all the answers

What state does a substance exist in at its triple point?

<p>Simultaneously in solid, liquid, and gas phases. (D)</p> Signup and view all the answers

Which process utilizes an electrochemical gradient to produce ATP?

<p>Chemiosmosis (D)</p> Signup and view all the answers

Which type of cell is responsible for secreting bone material?

<p>Osteocyte (C)</p> Signup and view all the answers

Which spinal region consists of the highest number of vertebrae?

<p>Thoracic (A)</p> Signup and view all the answers

Which of the following is NOT involved in the process of releasing a reproductive egg?

<p>Fertilization (A)</p> Signup and view all the answers

What is the primary function of sodium bicarbonate released by the pancreas?

<p>Neutralizing the acidity of chyme (C)</p> Signup and view all the answers

What is the approximate threshold value for mammalian neurons, at which they are more likely to generate an action potential?

<p>-55 mV (C)</p> Signup and view all the answers

Which blood vessels are directly impacted during a myocardial infarction?

<p>Coronary arteries (A)</p> Signup and view all the answers

What is the primary mechanism by which carbon dioxide from the blood moves into the alveoli?

<p>Diffusion down a concentration gradient (B)</p> Signup and view all the answers

What is the most common cause of a tsunami?

<p>Earthquakes (D)</p> Signup and view all the answers

What determines the atomic number of an atom with 12 protons and 12 neutrons?

<p>The number of protons (A)</p> Signup and view all the answers

Why is nitrogen gas (N2) considered an extremely stable molecule?

<p>It has a triple bond between the two nitrogen atoms. (D)</p> Signup and view all the answers

What is the correct sequence of events in the female reproductive cycle, starting with the maturation of an ovarian follicle?

<p>Oogenesis, Ovulation, Menstruation, Fertilization (B)</p> Signup and view all the answers

Which of the following is NOT a function of the pancreas in the digestive system?

<p>Production of bile (B)</p> Signup and view all the answers

What is the main reason why the threshold potential is significant for neuron function?

<p>It is the point at which a neuron becomes more excitable and likely to fire an action potential. (A)</p> Signup and view all the answers

Which of the following is a primary function of the vena cava?

<p>Carrying deoxygenated blood from the body to the heart. (B)</p> Signup and view all the answers

What is the key difference between passive transport and active transport?

<p>Active transport requires energy, while passive transport does not. (C)</p> Signup and view all the answers

Which of the following is NOT a potential consequence of a blockage in the coronary arteries?

<p>Stroke (B)</p> Signup and view all the answers

Which of the following statements about the role of diffusion in gas exchange is correct?

<p>Diffusion involves the movement of gases from a region of higher concentration to a region of lower concentration. (A)</p> Signup and view all the answers

Why is the atomic mass of an atom not directly determined by its atomic number?

<p>Atomic mass is influenced by the number of neutrons, which is not reflected in the atomic number. (D)</p> Signup and view all the answers

Flashcards

Major parts of the nervous system

The two main components of the nervous system are the PNS and CNS.

Peripheral Nervous System (PNS)

The part of the nervous system that includes all nerves outside the brain and spinal cord.

Central Nervous System (CNS)

The part of the nervous system that includes the brain and spinal cord.

Carbonic Acid

A substance that donates H+ ions to buffer blood when pH rises.

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Buffers in blood

Substances that help stabilize pH levels in the bloodstream.

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Melanin

A pigment in the skin that protects against ultraviolet rays.

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Urea

A waste product excreted by sweat glands after protein breakdown.

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Sweat Glands

Glands in the skin that excrete waste substances, including urea.

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Pleura

A protective membrane covering the lungs with two layers.

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Triple Point

Condition where solid, liquid, and gas phases coexist in equilibrium.

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Heterozygous Red Flowers

Plant genotype with one red and one white flower allele (Rr).

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pH Scale

Measures acidity; each whole number change represents tenfold intensity.

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Anti-Diuretic Hormone (ADH)

Hormone that increases water reabsorption in the kidney's collecting ducts.

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Peer Review

Validation process essential for credibility of scientific findings.

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Solid to Liquid Transition

As solids become liquids, particles lose order and gain mobility.

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Intermolecular Forces

Forces that hold particles together; weaken during phase changes.

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Physiological Balance

The state of equilibrium in bodily functions promoted by excretory processes.

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Mendelian Genetics

The study of inheritance patterns described by Gregor Mendel.

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Concentration of Hydrogen Ions

Determines acidity of a substance on the pH scale.

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Kidneys

Organs responsible for filtering blood and producing urine.

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Fluid in Pleural Space

The fluid that reduces friction between the pleura layers during breathing.

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Collecting Duct

Part of the nephron where ADH acts to reabsorb water.

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Ovulation

The process where an ovarian follicle matures and releases a reproductive egg.

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Function of Sodium Bicarbonate

Neutralizes the acidity of chyme in the small intestine.

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Threshold Value for Neurons

Around -55 mV, the point where a neuron may generate an action potential.

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Myocardial Infarction Vessels

Affects the coronary arteries, which supply blood to the heart muscle.

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Carbon Dioxide Movement into Alveoli

Occurs mainly through diffusion down a concentration gradient.

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Common Cause of Tsunamis

Earthquakes displace a large volume of water, triggering tsunamis.

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Atomic Number

Determined by the number of protons in an atom's nucleus.

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Protons and Neutrons Relationship

Neutrons contribute to atomic mass but do not affect the atomic number.

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Pancreatic Enzyme Activity

Sodium bicarbonate creates an optimal pH for pancreatic enzymes.

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Action Potential Generation

Triggered when the membrane potential reaches -55 mV.

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Chyme

Partially digested food mixed with digestive juices in the stomach.

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Function of Coronary Arteries

Supply blood to the heart muscle to sustain its function.

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Diffusion Process

Movement of substances from high to low concentration without energy.

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Tsunami Formation

Triggered by underwater disturbances such as earthquakes.

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Triple covalent bonds

A type of bond where three pairs of electrons are shared between atoms.

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Reverse transcriptase

An enzyme that converts RNA to DNA in retroviruses.

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Cytoskeleton

The structural framework of a cell, primarily made of proteins.

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Protons in lithium

Lithium has 3 protons, equal to its atomic number.

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Complementary DNA strands

DNA strands that pair bases according to specific rules (A-T and C-G).

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Polarity of water

Water's property that allows it to dissolve many substances.

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Catalyst function

To accelerate a chemical reaction without being consumed.

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Plasma B cells

Cells that produce and release antibodies in the immune system.

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Nitrogen gas structure

Nitrogen gas (N2) is made up of a triple covalent bond between two nitrogen atoms.

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Macromolecules forming cytoskeleton

Proteins make up the cytoskeleton of cells.

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Mass number and atomic number

Mass number is the sum of protons and neutrons, atomic number is protons only.

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Antibody role

Antibodies neutralize and identify harmful pathogens.

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Base pairing rules in DNA

Specific pairing of bases: A-T and C-G.

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Chemical reaction speed

A catalyst speeds up chemical reactions without changing product quantity.

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Role of HIV in T-cell

HIV uses reverse transcriptase to integrate its RNA into host DNA.

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Centrosome Function

Organizes microtubules in animal cells.

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Microtubule Organization

Essential for cell structure and transport.

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Amino Acid Structure

Contains both amine and carboxyl groups.

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Troponin Complex Function

Calcium binding initiates muscle contraction.

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Viruses Characteristics

Lack metabolic pathways, need host to reproduce.

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Osmosis

Movement of water across a membrane from low to high solute concentration.

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Hygiene Hypothesis

Worm infection may reduce autoimmune disorders.

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Genotype of Smooth Leaves

Offspring from 'ff by ff' will have smooth leaves.

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Peptide Bonds

Link amino acids to form proteins.

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Role of Calcium in Muscles

Calcium promotes actin and myosin interaction.

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Hypothalamus Location

Located in the brain; synthesizes ADH.

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Hypertonic Solutions

Higher solute concentration outside the cell.

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Organelles in Cells

Cell structures that perform specific functions.

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Water Regulation in the Body

ADH controls kidney water reabsorption.

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Cytokines

Signaling molecules released by immune cells to activate others.

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Osteoporosis

A condition of weakened bones due to reduced density.

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Control Group

The standard group in an experiment for comparison.

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Pulmonary Vein

Blood vessel that carries oxygenated blood to the heart.

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Totipotent Cells

Cells capable of developing into any cell type.

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Genes

Units of heredity that determine DNA sequence.

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Terminal Velocity

The maximum speed a falling object reaches.

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Charged Ions

Atoms that have lost or gained electrons and have a charge.

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Osteoblasts

Cells responsible for forming new bone tissue.

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Osteoclasts

Cells that break down old or damaged bone.

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Perforin

Protein that creates holes in target cells during immune response.

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Granzymes

Enzymes that induce apoptosis in target cells.

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Air Resistance

Force opposing the motion of falling objects.

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DNA Sequencing

Process of determining the precise order of nucleotides.

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Brittle Bones

Weak bones that are more prone to fractures.

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Chloride ion

A negatively charged ion formed when chlorine gains an electron.

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Soap as an emulsifier

Soap has a dual nature that bonds oil (nonpolar) and water (polar).

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Spleen function

An organ that filters blood and removes germs from it.

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Monosaccharides

Simple sugars that consist of single sugar units, like glucose and galactose.

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Atlas vertebra

The first cervical vertebra that allows the skull to rotate on the neck.

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Chemiosmosis

The process producing ATP using an electrochemical gradient.

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Osteocytes

Cells responsible for maintaining and secreting bone material.

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Thoracic vertebrae

The spinal region with the largest number of vertebrae (12).

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Lactase enzyme

An enzyme that breaks down lactose into galactose and glucose.

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Study Notes

Nervous System

  • Major parts of the nervous system are the peripheral nervous system (PNS) and the central nervous system (CNS).

Blood pH Buffering

  • Carbonic acid (D) donates H+ ions to act as a buffer when blood pH rises.

UV Protection

  • Melanin (D) protects the body from ultraviolet rays.

Waste Excretion

  • Urea (C) is excreted by sweat glands in response to protein breakdown and ammonia formation.

Pleura Covering

  • The lungs (B) are covered by the pleura, a connective tissue sheath.

Phase Diagrams

  • A substance held at a temperature and pressure where solid, liquid, and gaseous states coexist is called the triple point (B).

Genetics

  • If a heterozygous red flower (Rr) is bred with a white flower (rr) plant, the expected phenotypic ratio in the next generation will be 2 red to 2 white flowers (A).

pH Scale

  • A substance with a pH of 3 is 10 times more acidic than a substance with a pH of 4 (D).

Antidiuretic Hormone (ADH)

  • ADH increases water reabsorption in the collecting duct (D).

Scientific Publishing

  • For new scientific findings to be published, other scientists need to validate or discredit the findings (B).

Solid-Liquid Transition

  • As solids transition into liquids, particles become less ordered (A), resulting in increased mobility and distance between particles.

Ovulation

  • Ovulation (B) is the process where an ovarian follicle matures and releases an egg.

Pancreas Function

  • Sodium bicarbonate (A) from the pancreas neutralizes the acidity of chyme (food in the small intestine).

Neuron Threshold

  • The threshold value for mammalian neurons is approximately -55 mV (B).

Myocardial Infarction

  • A myocardial infarction (heart attack) affects the coronary arteries (A).

Carbon Dioxide Removal

  • Carbon dioxide moves from blood to alveoli by diffusion down a concentration gradient (B).

Tsunami Cause

  • Earthquakes (A) are a common cause of tsunamis.

Atomic Number

  • An atom with 12 protons and 12 neutrons has an atomic number of 12 (C).

Nitrogen Stability

  • Nitrogen gas (N2) is extremely stable due to triple covalent bonds (C).

AIDS Virus Replication

  • Reverse transcriptase (B) allows the AIDS virus to insert viral DNA into host T-cells. Converting RNA into DNA.

Cytoskeleton

  • Proteins (A) form the cytoskeleton.

Lithium Atom

  • A lithium atom with an atomic number of 3 and a mass number of 7 has 3 protons (D).

Complementary DNA Strand

  • If a DNA strand reads 5' AGCTAGCGT 3', the complementary strand reads 3' TCGATCGCA 5' (C).

Water's Solvent Properties

  • Water's polarity (B) is the primary reason it dissolves certain substances.

Catalysts in Reactions

  • Catalysts accelerate chemical reactions by lowering activation energy, completing the reactions faster (C).

Antibody Production

  • Plasma B cells (C) produce and release antibodies.

Centrosome Function

  • Centrosomes organize microtubules in animal cells (D).

Organic Molecules

  • Proteins (D) contain both amine and carboxyl groups.

Antidiuretic Hormone Synthesis

  • The hypothalamus (C) synthesizes antidiuretic hormone (ADH).

Muscle Contraction

  • Calcium ions (D) initiate muscle contraction by binding to the troponin complex.

Microorganisms

  • Viruses (B) are microorganisms that lack metabolic pathways and rely on a host cell for reproduction.

Hypertonic Solutions

  • Osmosis (C) involves water movement through aquaporins in hypertonic solutions.

Worm Infections and Autoimmune Disorders

  • Worm infections may reduce certain autoimmune disorders (A).

Plant Leaf Crossing

  • A cross between two smooth-leaved plants (ff x ff) will result in offspring with only smooth leaves (B).

Immune Cell Activation

  • Cytokines (B) are released by immune cells to directly activate other immune cells.

Osteoporosis

  • Osteoporosis occurs from a decline in osteoblast activity while osteoclast activity is unchanged (B).

Experimental Design

  • The control group (A) is used as a standard of comparison for the experimental group.

Oxygenated Blood

  • Pulmonary veins (A) carry oxygenated blood.

Totipotent Cells

  • Totipotent cells can develop into any cell type (B).

DNA Sequencing

  • Genes (D) are used to determine a person's DNA sequence.

Terminal Velocity

  • Heavier objects fall faster than lighter objects (D) because gravity's force is greater.

Chloride Ion Charge

  • Chloride ions (Cl-) gain an electron to have a negative charge (C).

Soap Function

  • Soap's dual polar and nonpolar nature lets it bind oil and water (A), making it helpful for washing.

Immune Structures and Function

  • The spleen (C) removes germs from the blood.

Lactose Breakdown Products

  • Galactose and glucose (D) resulting from lactose breakdown are monosaccharides.

Skull Rotation

  • The atlas (C), the first cervical vertebra, allows skull rotation.

Triple Point

  • The triple point (C) is the temperature and pressure where all three phases (solid, liquid, gas) exist simultaneously.

ATP Production

  • Chemiosmosis (A) uses an electrochemical gradient to create ATP.

Bone Material Secretion

  • Osteocytes (D) secrete bone material.

Spinal Regions

  • The thoracic region (A) has the highest number of vertebrae (12).

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