Life Functions and Cells Overview

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Questions and Answers

What is produced in the aerobic respiration process?

  • Oxygen and Glucose
  • Glucose and Water
  • ATP and Oxygen
  • Carbon Dioxide and Water (correct)

Which macromolecule is made of amino acids?

  • Carbohydrates
  • Proteins (correct)
  • Lipids
  • Nucleic Acids

How much energy is typically passed on to the next trophic level in an energy pyramid?

  • 5%
  • 20%
  • 50%
  • 10% (correct)

Which process involves the breakdown of larger molecules into smaller ones?

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

What component of the cell membrane is primarily responsible for its structure?

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

What type of molecules are starch and glycogen categorized as?

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

What is the primary role of enzymes in biological systems?

<p>Facilitating chemical reactions (B)</p> Signup and view all the answers

Which cycle includes both respiration and photosynthesis?

<p>Carbon-Oxygen Cycle (B)</p> Signup and view all the answers

What element is present in proteins that is not found in carbohydrates?

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

Which of the following is NOT a function of lipids in the body?

<p>Serving as the primary energy source (C)</p> Signup and view all the answers

Which life function is primarily responsible for energy production within cells?

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

What is the function of the ribosome in a cell?

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

What is necessary for a species to survive even though it may not be necessary for an individual organism?

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

Which part of the cell serves as a semi-permeable barrier regulating what enters and exits the cell?

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

What is the primary purpose of chloroplasts in plant cells?

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

What process produces oxygen and glucose during photosynthesis?

<p>Carbon dioxide and water are combined with sunlight (C)</p> Signup and view all the answers

Which organelle is responsible for controlling the cell and containing genetic information?

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

What primary function does the vacuole serve in a plant cell?

<p>Storage of materials (A)</p> Signup and view all the answers

Which of the following is NOT a level of organization in biological systems?

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

Which light color is known to promote the least amount of photosynthesis?

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

Flashcards

Respiration

Process that makes energy (ATP) through the breakdown of glucose.

Aerobic Respiration

Respiration requiring oxygen to produce a large amount of ATP (36 ATPs).

Anaerobic Respiration

Respiration without oxygen, resulting in smaller amount of ATP (few ATPs).

Mitochondria

Cellular organelle where respiration occurs.

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Energy Pyramid

Diagram representing energy flow in a food chain or web. Only 10% energy transfers to next trophic level.

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Food Web

Complex network of interconnected food chains showing relationships between organisms.

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Food Chain

Linear sequence showing the feeding relationships between different organisms.

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Decomposer

Organism that breaks down dead organisms and returns nutrients to the environment.

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Organic Molecules

Molecules containing carbon and hydrogen atoms.

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Macromolecule

Large molecules made up of repeating smaller units (monomers).

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Monosaccharide

Simplest type of carbohydrate, e.g., glucose.

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Protein

Macromolecule composed of amino acids, crucial for various functions like enzymes and structure.

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Amino Acid

Basic building blocks of proteins.

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Enzyme

Protein that speeds up chemical reactions in the body.

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Hydrolysis

Breaking down a large molecule into smaller ones by adding water.

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Dehydration Synthesis

Building a larger molecule from smaller ones by removing water.

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Lipid

Macromolecule composed of 3 fatty acids and a glycerol.

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Carbohydrate

Macromolecule composed of sugars, providing energy.

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Life Functions

Essential processes that enable an organism to survive and reproduce.

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Nutrition

Taking in and using nutrients for growth, repair, and energy.

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Transport

Moving materials within an organism.

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Respiration

Breaking down nutrients to release energy.

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Excretion

Removing wastes from an organism.

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Growth

Increasing in size or number of cells.

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Synthesis

Combining smaller molecules to build larger ones.

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Regulation

Controlling and coordinating functions in an organism.

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Reproduction

Producing offspring.

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Metabolism

All chemical reactions in an organism.

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Homeostasis

Maintaining a stable internal environment.

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Levels of Organization

Organelles, cells, tissues, organs, organ systems, and organisms.

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Organelle

Specialized structure within a cell that perform specific jobs.

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Cell

Basic unit of life, performing various functions.

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Tissue

Group of similar cells performing a specific function.

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Organ

Structure composed of multiple tissues working together.

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Organ System

Group of organs working together in a coordinated manner.

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Organism

A complete living thing comprising organ systems working together.

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Cell Membrane

Outer layer of a cell, controlling what goes in and out.

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Cell Wall

Rigid outer layer of plant cells providing support.

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Cytoplasm

Fluid-like substance inside the cell, holding organelles.

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Nucleus

Control center of the cell, containing genetic information.

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Mitochondria

Powerhouse of the cell, producing energy via cellular respiration.

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Ribosome

Protein synthesis occurs here

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Vacuole

Stores water and other materials.

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Chloroplast

Site of photosynthesis in plant cells.

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Photosynthesis

Conversion of light energy into chemical energy (glucose).

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Leaves

Primary site of photosynthesis in plants.

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Stomates

Small openings on leaves for gas exchange (CO2 & O2).

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Guard Cells

Surround stomates that open and close for regulation.

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Chlorophyll

Green pigment that absorbs light energy for photosynthesis.

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Study Notes

Life Functions

  • Living organisms take in materials for growth and repair (nutrition)
  • Materials are moved through the organism (transport)
  • Nutrients are broken down to make energy (respiration)
  • Waste products are removed (excretion)
  • Living things increase in size or cell number (growth)
  • Smaller molecules become larger molecules (synthesis)
  • Activities are controlled and coordinated (regulation)
  • Offspring are produced (reproduction). Reproduction is not needed for an individual organism to survive, but is necessary for a species to continue

Cells

  • Levels of organization include organelles, cells, tissues, organs, organ systems, and organisms
  • Organelles are specialized parts of cells with specific jobs
  • Cells are the basic units of life, each performing many functions
  • Tissues are groups of similar cells working together
  • Organs are groups of different tissues working together
  • Organ systems are multiple organs working together
  • Organisms are many organ systems working together

Parts of the Cell

  • Cell membrane is a semi-permeable layer enclosing the contents of the cell
  • Cell wall supports plant cells
  • Cytoplasm is a gel-like substance holding organelles
  • Nucleus contains genetic information
  • Mitochondria produce energy through respiration
  • Ribosomes synthesize proteins
  • Vacuoles store materials
  • Chloroplasts perform photosynthesis (only in plant cells)

Plants

  • Leaves have guard cells/stomates that control gas exchange (CO2 in, O2 out), and water movement
  • Stomates open and close to maintain homeostasis under various conditions
  • Photosynthesis takes place in chloroplasts, located primarily in the top layer of leaves
  • Photosynthesis converts light energy to chemical energy (sugars) using carbon dioxide and water

Respiration

  • Aerobic respiration needs oxygen to metabolize glucose, yielding energy and producing carbon dioxide as a byproduct
  • Anaerobic respiration needs no oxygen, and results in less energy being produced.

Energy Pyramids

  • Energy in an ecosystem flows from producers (plants) to consumers (primary, secondary, tertiary)
  • Approximately 10% of energy is transferred to each successive level

Body Systems

  • Nervous system sends messages throughout the body
  • Circulatory system moves materials around the body
  • Respiratory system is responsible for gas exchange
  • Excretory system removes waste products
  • Digestive system breaks down food into usable components

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