Macromolecules Overview Quiz

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Questions and Answers

What is the process of using sunlight energy to create glucose called?

  • Transpiration
  • Photosynthesis (correct)
  • Fermentation
  • Respiration

Where in the plant cell does photosynthesis primarily take place?

  • Cell membrane
  • Mitochondria
  • Nucleus
  • Chloroplast (correct)

Which pigment is responsible for the green color of leaves and plays a key role in photosynthesis?

  • Xanthophyll
  • Anthocyanin
  • Chlorophyll (correct)
  • Carotene

What are the two main functions of chloroplasts?

<p>To produce food and store energy (A)</p> Signup and view all the answers

Why do leaves primarily appear green to our eyes?

<p>They reflect green and yellow wavelengths. (D)</p> Signup and view all the answers

What is the molecular formula for glucose?

<p>C6H12O6 (A)</p> Signup and view all the answers

Which of the following statements about photosynthesis is true?

<p>It requires light energy to convert CO2 and water into glucose. (D)</p> Signup and view all the answers

During photosynthesis, what do plants convert into glucose?

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

What is the primary characteristic of passive transport?

<p>Occurs without energy expenditure (B)</p> Signup and view all the answers

What happens when a cell is placed in a saline solution?

<p>Water molecules will move out of the cell (D)</p> Signup and view all the answers

Which process is a characteristic of active transport?

<p>Movement from low to high concentration (C)</p> Signup and view all the answers

In facilitated diffusion, how do substances move across a plasma membrane?

<p>From high to low concentration without energy (D)</p> Signup and view all the answers

What most likely occurs when a cell with 85% water is placed in a beaker with 65% water?

<p>Water moves out of the cell (A)</p> Signup and view all the answers

What role do transport proteins play in cellular transport?

<p>They assist in moving molecules across the membrane using energy (C)</p> Signup and view all the answers

What will happen to a cell in pure water?

<p>The cell will swell as water enters (A)</p> Signup and view all the answers

Which statement accurately describes diffusion?

<p>It involves movement along the concentration gradient (C)</p> Signup and view all the answers

What are the reactants in the photosynthesis process?

<p>Carbon dioxide, water, and sunlight (D)</p> Signup and view all the answers

What is one of the primary products of photosynthesis?

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

What is the main purpose of chlorophyll in plants?

<p>To absorb light energy for photosynthesis (B)</p> Signup and view all the answers

Which of these is NOT a source of carbon dioxide in the atmosphere?

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

Where does photosynthesis primarily take place in the plant?

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

Which statement best describes the glucose produced in photosynthesis?

<p>It is used for energy and growth. (A)</p> Signup and view all the answers

What role does sunlight play in the photosynthesis process?

<p>It provides the energy necessary for the reaction. (D)</p> Signup and view all the answers

Which pigment is responsible for absorbing blue and red light during photosynthesis?

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

What is the significance of oxygen in the photosynthesis process?

<p>It is a waste product essential for respiration. (A)</p> Signup and view all the answers

What is produced as a result of combining carbon dioxide, water, and sunlight?

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

Which of these statements is true regarding plants?

<p>Plants are autotrophs that perform photosynthesis. (B)</p> Signup and view all the answers

Which of the following factors can negatively affect photosynthesis?

<p>Limited water supply (B)</p> Signup and view all the answers

What kind of energy is produced during the photosynthesis process?

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

What is an example of a simple carbohydrate?

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

What chemical is commonly used to test for lipids?

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

What is one function of a protein?

<p>Act as enzymes (A)</p> Signup and view all the answers

Where are proteins primarily made in a cell?

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

What is the primary monomer that makes up proteins?

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

Which of the following are reactants of photosynthesis?

<p>Carbon dioxide and water (A)</p> Signup and view all the answers

What is the primary energy source for photosynthesis?

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

What type of molecule do whales primarily use for energy storage?

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

In which organelle does photosynthesis take place?

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

What is the primary role of enzymes in biochemical reactions?

<p>Lower activation energy (B)</p> Signup and view all the answers

Why is the structure of an enzyme important?

<p>It enables specific substrates to fit. (C)</p> Signup and view all the answers

Which organelle is responsible for cellular respiration?

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

What is the main structural difference between plant and animal cells?

<p>Plant cells contain chloroplasts (D)</p> Signup and view all the answers

What can alter an enzyme's structure affecting its function?

<p>Temperature and pH changes (D)</p> Signup and view all the answers

Which statement about ribosomes is true?

<p>They are the site of protein synthesis (B)</p> Signup and view all the answers

What happens to enzymes after a biochemical reaction?

<p>They remain unchanged. (B)</p> Signup and view all the answers

If a cell’s lysosomes were damaged, which of the following would occur?

<p>It would be unable to digest waste properly (D)</p> Signup and view all the answers

How do enzymes increase the reaction rate?

<p>By providing a site for substrates to react (B)</p> Signup and view all the answers

What is the typical characteristic of cell membranes in relation to certain molecules?

<p>They are selectively permeable. (B)</p> Signup and view all the answers

Which of the following best describes the function of the cell membrane?

<p>Regulates movement of substances in and out (A)</p> Signup and view all the answers

What is the function of the vacuole in plant cells?

<p>Stores water and nutrients (B)</p> Signup and view all the answers

What likely occurs to lettuce cells when salt is added to a salad?

<p>They lose water due to osmosis. (A)</p> Signup and view all the answers

When does active transport typically occur in cells?

<p>When moving ions against their gradient (B)</p> Signup and view all the answers

What is the primary characteristic of prokaryotic cells?

<p>They lack membrane-bound organelles (C)</p> Signup and view all the answers

What is the monomer for proteins?

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

What organelle is primarily involved in modifying and packaging proteins?

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

Which cellular structure supports and protects the plant cell?

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

What distinguishes eukaryotic cells from prokaryotic cells?

<p>Membrane-bound organelles (A)</p> Signup and view all the answers

Flashcards

Photosynthesis

A process where plants use sunlight energy to make glucose (sugar) from carbon dioxide and water.

Chloroplasts

Organelles within plant cells where photosynthesis takes place. They contain chlorophyll.

Chlorophyll

The pigment in chloroplasts that absorbs most colors of light, except green and yellow, which it reflects.

Glucose

A simple sugar (C6H12O6) produced during photosynthesis, serving as food for plants.

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What is the formula for photosynthesis?

The formula for photosynthesis is: 6CO2 + 6H2O + sunlight --> C6H12O6 + 6O2. This means 6 molecules of carbon dioxide and 6 molecules of water react with sunlight to produce 1 molecule of glucose and 6 molecules of oxygen.

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Where does photosynthesis occur?

Photosynthesis takes place in the chloroplasts, which are organelles found within plant cells. Specifically in the thylakoids and stroma of the chloroplast.

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What is the main function of chloroplasts?

The main functions of chloroplasts are to produce glucose through photosynthesis and store food energy for the plant.

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Why do most leaves appear green?

Leaves appear green because chlorophyll, a pigment found in chloroplasts, absorbs most colors of light but reflects green and yellow wavelengths making those colors visible to our eyes.

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Photosynthesis Reactants

The substances used in photosynthesis, which are carbon dioxide (CO2) and water (H2O).

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Photosynthesis Products

The substances produced during photosynthesis, which are glucose (sugar) and oxygen (O2).

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Photosynthesis Energy Source

Sunlight is the primary energy source for photosynthesis.

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Animal vs. Plant Cells

Plant cells have chloroplasts, cell walls, and large vacuoles, while animal cells do not.

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Cytoplasm

The gel-like fluid that fills the cell, holding organelles and providing a medium for chemical reactions.

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Nuclear Membrane

A double membrane that surrounds the nucleus, protecting it and controlling what enters and leaves.

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Nucleus

The control center of the cell, containing DNA and directing cell activities.

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Endoplasmic Reticulum (ER)

A network of folded membranes that transports molecules throughout the cell.

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Ribosomes

Tiny structures that synthesize proteins, the building blocks of the cell.

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Golgi Apparatus

An organelle that processes, packages, and modifies proteins before they are transported to other parts of the cell.

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Vacuole

A storage organelle for water, food, and waste, typically large in plant cells.

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Lysosome

An organelle containing digestive enzymes, breaking down food and waste.

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Cell Membrane

A thin outer layer that controls what enters and exits the cell.

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Mitochondria

Organelles that convert glucose into usable energy for the cell through cellular respiration.

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Cell Wall

A rigid outer layer found in plant cells, providing support and protection.

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Photosynthesis Formula

The chemical equation representing the process of photosynthesis: CO2 + H2O + sunlight ----> C6H12O6 + O2. This means carbon dioxide and water, in the presence of sunlight, are converted into glucose and oxygen.

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Where does the plant get water?

The plant absorbs water from the ground through its roots.

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Where does water enter the plant?

Water enters the plant through its roots, which act like tiny straws absorbing water from the soil.

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Sources of CO2

Carbon dioxide comes from various sources, including living organisms breathing it out, factories, and cars.

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Energy used in Photosynthesis

Plants use light energy from the sun to convert carbon dioxide and water into sugar (glucose).

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What is glucose used for?

The glucose produced in photosynthesis is used by the plant for energy and growth. We also eat plants to get this glucose.

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What is oxygen used for?

Oxygen produced by photosynthesis is released into the air for us to breathe.

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Autotroph

Organisms that can make their own food, like plants, are called autotrophs. They use photosynthesis to do this.

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Light Dependent Reactions

The first stage of photosynthesis, where light energy is captured and converted into chemical energy in the form of ATP and NADPH. It happens within the thylakoids of the chloroplasts.

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Calvin Cycle

The second stage of photosynthesis where carbon dioxide is used to build sugar molecules. It occurs in the stroma of the chloroplast and doesn't require light.

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Carotenoids

Pigments responsible for orange, yellow, and red colors in leaves. They also absorb light energy for photosynthesis.

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Thylakoid

The stacked, disc-like structures within chloroplasts where light-dependent reactions occur.

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Passive Transport

Movement of molecules across a cell membrane without requiring energy. It follows the concentration gradient, moving from an area of high concentration to an area of low concentration.

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Active Transport

Movement of molecules across a cell membrane that requires energy, typically in the form of ATP. This movement can go against the concentration gradient, from an area of low concentration to an area of high concentration.

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Concentration Gradient

The difference in concentration of a substance between two areas. This difference drives the movement of molecules in passive transport.

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Diffusion

A type of passive transport where molecules move from an area of high concentration to an area of low concentration until equilibrium is reached.

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Equilibrium

A state where the concentration of a substance is equal throughout an area. No further movement is required in passive transport once equilibrium is reached.

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What is the role of ATP in active transport?

ATP provides the energy needed for active transport to move molecules against their concentration gradient. This is necessary to maintain the proper concentration of molecules within cells.

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How does water move across the cell membrane?

Water moves across the cell membrane through osmosis, a type of passive transport. Water moves from an area of high water concentration to an area of low water concentration.

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Simple Carbohydrate Example

A simple sugar, like glucose or fructose, that is easily digested by the body.

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Test for Complex Carbohydrate (Starch)

The iodine test. Iodine solution turns blue-black in the presence of starch.

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Lipid Function

Lipids play roles in energy storage, insulation, and cell membrane structure.

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Lipid Test

Sudan IV is a dye that stains lipids red.

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Where are Proteins Made?

Proteins are synthesized at ribosomes, small organelles within cells.

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Protein Function

Proteins have diverse roles, including building and repairing tissues, transporting substances, and acting as enzymes.

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Protein Test

The Biuret reagent test. Proteins turn a violet color in the presence of Biuret reagent.

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Elements in Carbohydrates

Carbohydrates are composed of the elements carbon, hydrogen, and oxygen.

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Macromolecule with C, H, O, N, S

This describes a protein, which is a complex molecule made from these elements.

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Examples of Proteins

Examples of proteins include enzymes, antibodies, and hormones.

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What are proteins made of?

Proteins are polymers made up of monomer units called amino acids.

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What molecule do whales use for energy storage and insulation?

Whales use lipids (fats) for energy storage and insulation.

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Lipid Monomer

Fatty acids are the monomers (building blocks) of lipids.

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Protein Monomer

Amino acids are the monomers (building blocks) of proteins.

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What is an Enzyme?

An enzyme is a biological catalyst, a protein that speeds up biochemical reactions without being consumed in the process.

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Study Notes

Macromolecules

  • Macromolecules are also called polymers.
  • Carbohydrates are made of monosaccharides (single sugars).
  • Nucleic acids are made of nucleotides.
  • Proteins are made of amino acids.
  • Lipids are made of fatty acids.
  • Chloroplasts produce carbohydrates.
  • Glucose is an example of a simple carbohydrate.
  • The test for complex carbohydrates(starch) is using iodine.
  • Lipids store energy and provide insulation.
  • The test for lipids is using grease stain or brown paper.
  • Proteins are made in ribosomes.
  • Proteins have many functions, including structural support and catalyzing reactions.
  • The test for proteins is called the biuret test.
  • Carbohydrates are composed of carbon, hydrogen, and oxygen.
  • Proteins are composed of carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur.
  • Examples of proteins include enzymes, hormones, and structural components.
  • Whales use lipids for energy storage and insulation.
  • Lipids are polymers made of monomers called fatty acids.
  • Proteins are polymers made of monomers called amino acids.

Enzymes

  • Enzymes are proteins that act as catalysts in biochemical reactions.
  • Enzymes reduce the activation energy needed for reactions to occur.
  • Enzymes remain unchanged after a reaction.
  • An enzyme's shape is important because it must fit with its substrate for a reaction to happen.
  • Environmental factors like temperature and pH can alter enzyme shape and their functionality.
  • Enzymes speed up reactions by providing a site for reactants to interact.
  • A specific enzyme catalyzes a specific reaction because an enzyme's shape matches the specific substrate.

Cell Transport

  • Passive transport does not require energy.
  • Active transport requires energy.
  • Diffusion is the movement of particles down a concentration gradient (from high to low concentration).
  • Osmosis is the diffusion of water.
  • Water moves from a higher water concentration to a lower water concentration.
  • Cell membranes are selectively permeable.
  • Lettuce wilts when placed in a salty solution because water moves out of the cells.
  • When a cell is placed in a hypertonic solution (higher solute concentration outside the cell), water moves out of the cell causing the cell to shrink.
  • When a cell is placed in a hypotonic solution (lower solute concentration outside the cell), water moves into the cell causing the cell to swell.
  • Facilitated diffusion is a passive transport mechanism that uses protein channels to help materials move across the membrane.

Cell Types

  • Cells are the basic unit of life.
  • All cells contain DNA.
  • Eukaryotic cells contain membrane-bound organelles.
  • Eukaryotes can be unicellular (e.g., protists) or multicellular (e.g., animals).
  • Prokaryotic cells do not have a nucleus or other membrane-bound organelles.
  • Organelles are membrane-bound compartments within a cell.
  • Prokaryotes include bacteria and archaea.
  • Key difference between prokaryotes and eukaryotes is the presence of membrane-bound organelles (particularly the nucleus).
  • Plant cells and animal cells are examples of eukaryotic cells.
  • Plant cells have chloroplasts and cell walls which animal cells do not possess.

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