TEAS 7 Science Practice Test X1
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Questions and Answers

Which of the following allows the AIDS virus, which contains RNA, to insert viral DNA into the DNA of a host cell after the AIDS virus enters the cell?

  • Reverse transcriptase, an enzyme encoded by the virus (correct)
  • Receptor proteins located on the surface of the virus
  • The protein that makes up the capsid of the virus
  • The phospholipids found on the envelope of the virus

    • Which of the following is the main function of centrosomes in animal cells?

  • Organelle trafficking
  • Microtubule organization (correct)
  • Cytoplasm formation
  • Pathogen digestion

    • Which of the following is a group that can be measured against the experimental group?

  • Control (correct)
  • Manipulated
  • Variable
  • Responding

    • Which of the following is used to determine a person's DNA sequence?

    <p>Enzymes</p> Signup and view all the answers

    The cytoskeleton of a cell is comprised of which of the following macromolecules?

    <p>Proteins</p> Signup and view all the answers

    Which of the following types of cells stimulates other immune cells to attack and destroy foreign agents?

    <p>Natural killer cells</p> Signup and view all the answers

    A strand of DNA bases reads 5' AGCTAGCGT 3', what would the sequence of bases on the complementary strand read?

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

    Which of the following conclusions is supported by the data provided in the table?

    <p>The time of fall is independent of the mass of the object</p> Signup and view all the answers

    Which of the following best explains why dipping an apple slice in lemon juice prevents it from browning?

    <p>Lemon juice has a pH which inactivates the enzymes</p> Signup and view all the answers

    Which of the following characteristics of water helps explain why coastal areas experience less dramatic temperature changes during the day?

    <p>Water has a high specific heat capacity</p> Signup and view all the answers

    Which part of the eukaryotic cell is responsible for making ATP?

    <p>Mitochondria</p> Signup and view all the answers

    What are the three types of salivary glands and where are they located in the mouth?

    <p>Parotid, sublingual, and submandibular glands located in the cheeks, tongue, and roof of the mouth, respectively</p> Signup and view all the answers

    Which of the following substances is excreted by the kidneys to regulate blood pressure?

    <p>renin</p> Signup and view all the answers

    What is the chemical formula for water?

    <p>H2O</p> Signup and view all the answers

    Which of the following units is used to indicate length?

    <p>m</p> Signup and view all the answers

    A researcher collects data on the number of cars passing through a busy intersection at different times of the day for a month. This data would be most useful to analyze which of the following?

    <p>traffic patterns during rush hour</p> Signup and view all the answers

    What is the largest organ in the human body by surface area?

    <p>Skin</p> Signup and view all the answers

    Which of the following describes the function of ligaments?

    <p>Ligaments attach two bones</p> Signup and view all the answers

    What is the difference between innate and adaptive immunity?

    <p>Innate immunity is present at birth while adaptive immunity is acquired after exposure to pathogens</p> Signup and view all the answers

    Which of the following is responsible for carrying amino acids to ribosomes during protein synthesis?

    <p>tRNA</p> Signup and view all the answers

    What are the steps involved in the scientific method?

    <p>Observation, hypothesis, prediction, experimentation, analysis, conclusion</p> Signup and view all the answers

    What is the difference between a solid and a liquid?

    <p>Solids have a definite shape and volume while liquids have a definite volume but no fixed shape</p> Signup and view all the answers

    Which part of the respiratory system is responsible for regulating breathing rate and depth?

    <p>Diaphragm</p> Signup and view all the answers

    What is the difference between a monosaccharide and a disaccharide?

    <p>Monosaccharides are simple sugars that cannot be further broken down into simpler sugars while disaccharides are composed of two simple sugars</p> Signup and view all the answers

    Which of the following is the process by which DNA is copied into RNA?

    <p>Transcription</p> Signup and view all the answers

    What is the role of calcium in muscle contraction?

    <p>Calcium is released from the sarcoplasmic reticulum to initiate the sliding of actin and myosin filaments</p> Signup and view all the answers

    What is the name of the dome-shaped muscle that plays a key role in breathing?

    <p>Diaphragm</p> Signup and view all the answers

    What is the role of the epididymis in sperm maturation?

    <p>The epididymis stores and protects sperm cells until ejaculation</p> Signup and view all the answers

    Which of the following is a function of the respiratory system?

    <p>Exchange of gases between the body and the environment</p> Signup and view all the answers

    What is the difference between isotonic and isometric muscle contractions?

    <p>Isotonic contractions produce movement while isometric contractions produce no movement</p> Signup and view all the answers

    Which of the following is a characteristic of innate immunity?

    <p>It provides immediate, non-specific protection</p> Signup and view all the answers

    Which of the following is NOT one of the four primary tissue types found in the human body?

    <p>Exocrine glandular</p> Signup and view all the answers

    Which of the following is a type of genetic mutation that involves the insertion or deletion of one or more nucleotides in a DNA sequence?

    <p>Frameshift mutation</p> Signup and view all the answers

    Which of the following describes the process of osmosis?

    <p>Movement of water molecules from an area of high concentration to an area of low concentration through a selectively permeable membrane</p> Signup and view all the answers

    Which of the following is a chemical property of a substance?

    <p>Reactivity with acid</p> Signup and view all the answers

    Which statement best defines the difference between a physical change and a chemical change?

    <p>A physical change involves the rearrangement of atoms and molecules while a chemical change involves the formation of new substances with different chemical properties</p> Signup and view all the answers

    During embryonic development, which of the following germ layers forms the nervous system?

    <p>Ectoderm</p> Signup and view all the answers

    What is the primary pigment responsible for photosynthesis in plants?

    <p>Chlorophyll a</p> Signup and view all the answers

    Which of the following is an example of an exothermic reaction?

    <p>Burning wood</p> Signup and view all the answers

    Which of the following statements is true regarding vaccines?

    <p>Vaccines work by exposing the individual to a weakened or inactivated form of the pathogen</p> Signup and view all the answers

    What is the function of ribosomes in a cell?

    <p>To synthesize proteins in the cell</p> Signup and view all the answers

    Emphysema caused by damage to alveoli from toxins and pollutants is likely to result in the body having difficulty performing which of the following actions?

    <p>Exchanging oxygen and carbon dioxide</p> Signup and view all the answers

    For which of the following reasons does a chloride ion have a negative charge?

    <p>It lost an electron</p> Signup and view all the answers

    Which of the following substances is excreted by sweat glands in response to the breakdown of proteins and the formation of ammonia?

    <p>Urea</p> Signup and view all the answers

    The triple point of a substance is the temperature and pressure at which the substance exists as which of the following?

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

    A patient goes to the doctor with a cold and sore throat and asks for antibiotics. The doctor refuses to prescribe antibiotics to the patient because the illness is caused by which of the following pathogens?

    <p>Virus</p> Signup and view all the answers

    Which of the following is an efferent neuron that is responsible for releasing a neurotransmitter that stimulates a muscle cell to contract?

    <p>Motor neuron</p> Signup and view all the answers

    Which of the following actions allows for repolarization of a neuron?

    <p>The opening of potassium channels allowing potassium to leave the neuron</p> Signup and view all the answers

    Which of the following structures is an exocrine gland?

    <p>Parotid gland</p> Signup and view all the answers

    Which of the following classes of biological molecules includes enzymes?

    <p>Proteins</p> Signup and view all the answers

    An individual suffers severe blunt trauma to the thoracic cavity. Which of the following organs are at greatest risk from this injury?

    <p>Heart and lungs</p> Signup and view all the answers

    Study Notes

    Here are the study notes for the TEAS 7 Science Practice Test:

    Human Body Systems

    • The three types of salivary glands are parotid, sublingual, and submandibular glands located in the roof of the mouth, cheeks, and under the jawbone, respectively.
    • The diaphragm is the dome-shaped muscle that plays a key role in breathing.
    • The epididymis is responsible for sperm maturation.

    Muscular System

    • Calcium binds to tropomyosin to expose the myosin-binding sites on actin during muscle contraction.
    • Isotonic contractions produce movement while isometric contractions produce no movement.

    Nervous System

    • The two major parts of the nervous system are the peripheral nervous system and central nervous system.
    • The primary pigment responsible for photosynthesis in plants is chlorophyll a.

    Cellular Biology

    • Ribosomes are responsible for synthesizing proteins in the cell.
    • Transfer RNA (tRNA) carries amino acids to the ribosome during protein synthesis.
    • The cytoskeleton of a cell is comprised of proteins.

    Genetics

    • DNA is copied into RNA through the process of transcription.
    • A frameshift mutation involves the insertion or deletion of one or more nucleotides in a DNA sequence.
    • A genetic disorder caused by the presence of an extra chromosome 21 is Down syndrome.

    Chemistry

    • The molecular formula for water is H2O.
    • The atomic number of an atom is the number of protons in the nucleus.
    • The polarity of water molecules explains its solvent abilities for certain substances.

    Scientific Inquiry

    • A control group is a group that is not exposed to the variable being tested.
    • A dependent variable is the variable being measured or observed in an experiment.

    Human Health

    • Insulin regulates blood sugar levels in the human body.
    • Vaccines work by exposing the individual to a weakened or inactivated form of the pathogen.

    Anatomy and Physiology

    • The primary physiological function of erythrocytes is to transport oxygen to body tissues.
    • The heart valve that separates the left atrium and left ventricle is the mitral valve.

    Microbiology

    • Viruses lack their own metabolic pathways and can only reproduce inside of a host cell.

    Let me know if you'd like me to clarify or expand on any of these points!Here are the study notes for the text:

    • Particles and Intermolecular Forces*
    • Particles have a decrease in mobility
    • Particles move closer together
    • Intermolecular forces between particles become stronger
    • Anatomy and Physiology*
    • The pleura is a connective tissue sheath that covers the lung
    • The pulmonary vein carries oxygenated blood
    • The tibia and fibula are located in the crural region
    • The myelin sheath performs insulation for nerve cells
    • Apocrine glands are part of the integumentary system and secrete pheromones
    • Lipids absorbed in the small intestine enter lacteal vessels first
    • Cellular Biology*
    • Cancer results from a genetic mutation that leads to uncontrolled cell division
    • Mitochondrial inner membrane has the same function as the thylakoid membrane in chloroplasts
    • Ovaies are involved in regulating milk production following childbirth
    • The pituitary gland is involved in regulating milk production following childbirth
    • Genetics*
    • A cross between a plant with green pods and a plant with yellow pods results in offspring with a 50% chance of having green pods and 50% chance of having yellow pods
    • In pea plants, green pod color (G) is dominant to yellow pod color (g)
    • Biochemistry*
    • Enzymes are biological molecules that speed up chemical reactions
    • Soap is an emulsifier that helps bond oil and water
    • Fibrinogen is a protein present in blood plasma
    • Physiology*
    • Emphysema is a disease that disrupts gas exchange in the lungs
    • The vermiform appendix extends from the region of the large intestine known as the cecum
    • The renal vein drains oxygen-depleted blood from the kidneys
    • Parathyroid hormone regulates blood calcium levels
    • The kidneys remove nitrogenous waste from the body
    • The digestive system breaks down proteins into amino acids
    • Chemistry*
    • The pH of a solution is calculated using the equation pH = -log (H+)
    • Water has a high specific heat capacity, which helps explain why coastal areas experience less dramatic temperature changes during the day
    • The atomic mass and atomic number of an atom change when a proton is emitted

    Let me know if you'd like me to help with anything else!### Energy Drinks and Running

    • Researchers conclude that energy drinks increase the speed of running based on collected results.

    Supporting the Conclusion

    • Repeating the experiment with the same conditions, but using 300 men (Option A) would help support the conclusion.
    • Giving half of the women water and the other half the energy drink (Option B) would also help support the conclusion by providing a control group.
    • Giving the women two different energy drinks (Option C) would not directly support the conclusion as it would introduce a new variable.
    • Changing the running distance (Option D) would not directly support the conclusion as it would alter the original experiment's conditions.

    Mount Everest Climb

    • An experienced mountaineer is retracing the same route as a fatal 1924 expedition to climb Mount Everest.
    • The scientific purpose of this climb is to assess why the earlier expedition failed (Option B).

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    TEAS 7 Science Practice Test X1 PDF

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    Assess your knowledge of science concepts with this 39-question practice test, covering topics like human anatomy and biology.

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