Biology Life Functions and Cells

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Questions and Answers

What is the primary function of mitochondria in a cell?

  • Produces energy through cellular respiration (correct)
  • Stores materials
  • Controls cell activities
  • Site of protein synthesis

Which life function is responsible for the maintenance of a stable internal environment?

  • Reproduction
  • Homeostasis (correct)
  • Growth
  • Transport

What role do chloroplasts play in plant cells?

  • Storage of materials
  • Photosynthesis (correct)
  • Cellular respiration
  • Protein synthesis

During photosynthesis, which of the following is produced?

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

Which of these processes is NOT considered a life function?

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

Which is the correct sequence of levels of organization from simplest to most complex?

<p>Organelle → Cell → Tissue → Organ → Organ System → Organism (B)</p> Signup and view all the answers

What is the function of the vacuole in plant cells?

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

What is the main purpose of stomates in plant leaves?

<p>To allow gas exchange (C)</p> Signup and view all the answers

What is the main difference between aerobic and anaerobic respiration?

<p>Aerobic respiration produces more ATP than anaerobic respiration. (D)</p> Signup and view all the answers

Which of the following is true regarding the energy pyramid?

<p>10% of energy typically gets passed on to the next consumer level. (B)</p> Signup and view all the answers

What defines an organic molecule?

<p>It contains carbon and hydrogen. (D)</p> Signup and view all the answers

Which building block corresponds to nucleic acids?

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

What is the primary function of lipids in the body?

<p>To provide structure to the cell membrane. (B)</p> Signup and view all the answers

What is the role of enzymes?

<p>To catalyze biochemical reactions. (A)</p> Signup and view all the answers

Which of the following processes involves the release of water?

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

Which cycle involves both respiration and photosynthesis?

<p>Carbon-Oxygen cycle (A)</p> Signup and view all the answers

What percentage of energy is typically transferred from one trophic level to the next in an energy pyramid?

<p>10% (D)</p> Signup and view all the answers

What primarily determines the function of a protein?

<p>The shape of the protein (B)</p> Signup and view all the answers

Which process involves building a larger molecule from smaller ones and releases water as a byproduct?

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

Which of the following macromolecules is composed of 3 fatty acids and a glycerol?

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

What is the primary function of decomposers in a food web?

<p>Break down organic matter (D)</p> Signup and view all the answers

Which of the following is not a component of the nitrogen cycle?

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

In the process of anaerobic respiration, what is the outcome compared to aerobic respiration?

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

Which type of sugar is characterized as a simple sugar?

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

Which body system is primarily responsible for sending messages throughout the body?

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

Which cycle includes precipitation as a key process?

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

Which process involves combining smaller molecules to form larger ones?

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

What is the function of the cell membrane?

<p>Regulates movement of materials in and out. (D)</p> Signup and view all the answers

Which of the following best describes respiration in living organisms?

<p>Breakdown of nutrients to release energy. (D)</p> Signup and view all the answers

Which organelle is specifically involved in protein synthesis?

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

What role does chlorophyll play in photosynthesis?

<p>Absorbs sunlight. (A)</p> Signup and view all the answers

Which statement about photosynthesis is true?

<p>Carbon dioxide and water are used to produce glucose. (A)</p> Signup and view all the answers

What is the main purpose of vacuoles in cells?

<p>Store materials. (A)</p> Signup and view all the answers

Which life function is necessary for species survival but not for individual organism survival?

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

How is homeostasis primarily maintained in living organisms?

<p>By regulation and coordination of activities (C)</p> Signup and view all the answers

What is the correct sequence of organizational levels from simplest to most complex?

<p>Organelle → Cell → Tissue → Organ → Organ System → Organism (C)</p> Signup and view all the answers

Flashcards

Aerobic Respiration

A type of cellular respiration that uses oxygen to create energy (ATP).

Anaerobic Respiration

A type of cellular respiration that doesn't use oxygen to create energy (ATP).

Glucose

A simple sugar (monosaccharide) used as a primary energy source for many living things.

ATP

Adenosine triphosphate, a molecule that stores and releases energy for cellular processes.

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Protein

A macromolecule built from amino acids, performing diverse functions in the body.

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Amino Acids

The building blocks of proteins.

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Carbohydrates

Macromolecules that store energy and provide structural support for cells.

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Monosaccharide

A simple sugar, such as glucose.

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Dehydration Synthesis

Building larger molecules by removing water.

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Hydrolysis

Breaking down larger molecules by adding water.

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Organic Molecule

Molecule containing carbon and hydrogen.

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Photosynthesis

The process plants use to create their own food using sunlight.

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Life Functions

Essential processes that sustain living organisms.

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Nutrition (Life Function)

Taking in materials for growth and repair.

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Transport (Life Function)

Moving materials in and around the organism.

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Respiration (Life Function)

Breaking down nutrients to make energy.

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Excretion (Life Function)

Removing cellular waste.

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Growth (Life Function)

Increasing in size or cell number.

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Synthesis (Life Function)

Combining smaller molecules to make larger ones.

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Regulation (Life Function)

Controlling and coordinating body activities.

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Reproduction (Life Function)

Producing offspring.

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Metabolism

Chemical processes maintaining life.

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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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Cell Membrane

Semi-permeable layer around a cell.

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Cell Wall

Provides support to plant cells.

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Cytoplasm

Gel-like substance holding organelles in place.

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Nucleus

Controls the cell and contains genetic material.

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Mitochondria

Produces energy through cellular respiration.

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Ribosomes

Site of protein synthesis.

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Vacuole

Stores materials, especially water.

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Chloroplast

Site of photosynthesis in plant cells.

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Photosynthesis

Process of turning light into chemical energy (glucose).

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Stomates

Small openings on leaves for gas exchange.

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Guard Cells

Cells that control the opening and closing of stomates.

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Aerobic Respiration

Process using oxygen to create energy (ATP).

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Anaerobic Respiration

Energy creation process without oxygen.

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Glucose

Simple sugar, primary energy source.

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ATP

Energy storing molecule.

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Protein

Complex molecule made of amino acids.

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Amino Acid

Building blocks of proteins.

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Carbohydrate

Macromolecule that stores energy.

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Monosaccharide

Single sugar unit.

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Dehydration Synthesis

Building larger molecules by removing water.

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Hydrolysis

Breaking down large molecules by adding water.

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Organic Molecule

Molecule containing carbon and hydrogen.

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Energy Pyramid

Shows energy flow through ecosystem.

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Food Web

Interconnected food chains.

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Food Chain

Sequence of organisms eating each other.

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Lipid

Macromolecule made of 3 fatty acids and glycerol.

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Life Functions

Essential processes for living organisms to survive.

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Nutrition

Taking in materials for growth and repair.

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Transport

Moving materials in and around the organism.

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Respiration

Breaking down nutrients to make energy.

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Excretion

Removing cellular/metabolic waste.

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Growth

Increasing in size or cell number.

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Synthesis

Combining smaller molecules to make larger ones.

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Regulation

Controlling and coordinating activities.

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Reproduction

Producing offspring.

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Metabolism

Chemical activities maintaining life.

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Homeostasis

Maintaining a stable internal environment.

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Cell Membrane

Semi-permeable layer around a cell.

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Cell Wall

Provides support to plant cells.

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Cytoplasm

Gel-like substance holding organelles.

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Nucleus

Controls the cell and contains DNA.

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Mitochondria

Produces energy through respiration.

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Ribosomes

Site of protein synthesis.

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Vacuole

Stores materials, especially water in plant cells.

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Chloroplast

Site of photosynthesis in plant cells.

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Photosynthesis

Process of turning light into chemical energy (glucose).

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Stomates

Small openings for gas exchange in leaves.

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Guard Cells

Cells that control stomata opening and closing.

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Levels of Organization

Organelles to Organism: the hierarchy of life from smallest to largest.

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Study Notes

Life Functions

  • Living organisms take in materials for growth and repair (nutrition)
  • Materials are distributed throughout the organism (transport)
  • Nutrients are broken down to make energy (respiration)
  • Cellular/metabolic waste is removed (excretion)
  • Living things increase in size or cell number (growth)
  • Smaller molecules combine to make larger ones (synthesis)
  • Various activities are controlled and coordinated (regulation)
  • Offspring are produced (reproduction). Reproduction isn't needed for an individual organism's survival, but it is crucial for the species' survival
  • Metabolism: chemical activities to maintain life
  • Homeostasis: maintaining a stable internal balance

Cells

  • Levels of organization: organelles, cell, tissue, organ, organ system, organism
  • Organelle: specialized structures inside cells performing various jobs
  • Cell: basic structural and functional unit of life
  • Tissue: similar cells working together
  • Organ: many tissues working together
  • Organ system: many organs working together
  • Organism: many organ systems working together

Parts of the Cell/Cell Organelles

  • Cell membrane: semi-permeable layer allowing material to pass in and out
  • Cell wall (plants): provides support
  • Cytoplasm: gel-like substance holding organelles
  • Nucleus: controls cell, containing information
  • Mitochondria: produces energy through cellular respiration
  • Ribosomes: site of protein synthesis
  • Vacuole: stores materials
  • Chloroplasts (plants): site of photosynthesis, containing chlorophyll

Plants

  • Leaves have guard cells/stomates for gas exchange (CO2 in, O2 out); water movement
  • Stomates open and close to maintain homeostasis, adjusting to environmental conditions (day/night, wet/dry).
  • Photosynthesis takes place in chloroplasts, mainly in the top layer of leaves
  • Photosynthesis: turning light energy into chemical energy to create sugar.
    • Carbon Dioxide + Water + Sunlight → Oxygen + Glucose + Water

Energy and Respiration

  • Green light is least effective for photosynthesis
  • Energy is stored in chemical bonds within molecules, like glucose (a simple sugar)
  • Aerobic respiration (with oxygen): makes a lot of ATP (energy) from glucose.
    • Oxygen + Glucose → Carbon Dioxide + Water + ATP
  • Anaerobic respiration (without oxygen): makes less ATP from glucose
  • Both processes take place in the mitochondria.
  • Energy is released when ATP is broken down to ADP + P.

Food Webs and Pyramids

  • Energy Pyramids/Biomass: show how energy flows through an ecosystem
  • Producers (plants), primary consumers (herbivores), secondary consumers (omnivores/carnivores)
  • 10% of energy gets transferred from one trophic level to the next. Most is lost as heat.

Bodies Systems

  • Nervous, Circulatory, Respiratory, Excretory, and Digestive Systems.
  • All help maintain homeostasis within the body.

Biochemistry

  • Macromolecules: large molecules that are essential for life.

  • Proteins: made up of amino acids.

  • Lipids: Made up of 3 fatty acids and a glycerol (stored energy)

  • Carbohydrates: simple sugars (glucose)

  • Nucleic Acids: DNA and RNA, carry genetic information, also building blocks

  • Dehydration synthesis: building molecules by removing water

  • Hydrolysis: breaking molecules by adding water

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