Biochemistry Quiz on Enzymes and Reactions
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Questions and Answers

What is the primary function of enzymes in biochemical reactions?

  • To permanently alter the substrates involved
  • To break down substrates into waste products
  • To act as catalysts that speed up reactions (correct)
  • To provide energy for the reactions

    • Which equation correctly represents cellular respiration?

  • C6H12O6 → 6CO2 + 6H2O + energy
  • 6CO2 + 6H2O → C6H12O6 + 6O2
  • C6H12O6 + 6O2 → 6CO2 + 6H2O (correct)
  • 6O2 + 6H2O → C6H12O6 + 6CO2

    • Why is photosynthesis considered an endothermic reaction?

  • It occurs only in the dark
  • It generates ATP as its primary product
  • It releases energy in the form of heat
  • It absorbs light energy to produce glucose (correct)

    • What accurately describes the specificity of enzymes?

    <p>Each enzyme's active site is designed for only one substrate</p> Signup and view all the answers

    What are the products of the photosynthesis reaction?

    <p>Glucose and oxygen</p> Signup and view all the answers

    What is metabolism primarily responsible for within a cell?

    <p>Providing energy and creating key molecules</p> Signup and view all the answers

    Which process involves breaking down larger molecules into simpler compounds while releasing energy?

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

    What is the role of activation energy in a chemical reaction?

    <p>It is the energy needed to initiate the reaction</p> Signup and view all the answers

    In an endothermic reaction, how is energy treated?

    <p>It is absorbed from the environment</p> Signup and view all the answers

    What happens to energy during chemical reactions based on the law of conservation?

    <p>Energy changes forms but is conserved</p> Signup and view all the answers

    Which of the following is NOT a product of biochemical reactions?

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

    Which of the following best describes an exothermic reaction?

    <p>It releases energy in the form of heat or light</p> Signup and view all the answers

    Which type of biochemical reaction requires energy to form larger molecules from simpler ones?

    <p>Anabolic reactions</p> Signup and view all the answers

    What term describes the change in the active site of an enzyme when it interacts with a substrate?

    <p>Induced fit</p> Signup and view all the answers

    Which environmental factor is NOT likely to cause enzyme denaturation?

    <p>Substrate concentration</p> Signup and view all the answers

    What happens to an enzyme's activity when it is denatured?

    <p>It loses its specific shape and biological activity</p> Signup and view all the answers

    Which statement about the bonding functions of enzymes is correct?

    <p>Enzymes can form bonds between substrates to create products</p> Signup and view all the answers

    Which of the following describes a potential outcome after denaturation of an enzyme?

    <p>The enzyme may regain its shape and function in some cases</p> Signup and view all the answers

    What effect does increasing temperature have on the rate of a chemical reaction?

    <p>It increases the reaction rate by speeding up molecular motion.</p> Signup and view all the answers

    How does a competitive inhibitor affect a chemical reaction?

    <p>It decreases the reaction rate by occupying the enzyme's active site.</p> Signup and view all the answers

    What is an example of how a catalyst functions in a chemical reaction?

    <p>It speeds up the reaction by lowering the activation energy required.</p> Signup and view all the answers

    Which factor does NOT affect the rate of a chemical reaction?

    <p>Color of the reactants</p> Signup and view all the answers

    In terms of energy, what distinguishes endothermic reactions from exothermic reactions?

    <p>Endothermic reactions absorb energy, while exothermic reactions release it.</p> Signup and view all the answers

    What is the main role of ATP in the body?

    <p>To carry and store energy for cell functions</p> Signup and view all the answers

    Which of the following components is not part of the structure of ATP?

    <p>Amine group</p> Signup and view all the answers

    What type of energy does ATP primarily carry?

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

    How many phosphate groups are present in one molecule of ATP?

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

    What must happen to the bonds in food for energy to be usable by the body?

    <p>They must be broken and reformed into ATP</p> Signup and view all the answers

    What happens to ADP when a phosphate group is added?

    <p>It becomes ATP and stores energy</p> Signup and view all the answers

    Which of the following statements accurately describes the reactions involving ATP and ADP?

    <p>The breakdown of ATP releases energy for cellular functions</p> Signup and view all the answers

    What is the energy transaction when ATP is converted to ADP?

    <p>Energy is released, marking it as an exothermic process</p> Signup and view all the answers

    What is required for the synthesis of ATP from ADP?

    <p>Energy derived from food to combine ADP and phosphate</p> Signup and view all the answers

    Why is the breakdown of ATP considered favorable for cells?

    <p>It releases more energy than required for the reaction</p> Signup and view all the answers

    Which macronutrient is primarily broken down to produce ATP for energy?

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

    How many ATP molecules can a single glucose molecule produce?

    <p>36 ATP</p> Signup and view all the answers

    What occurs when ATP loses a phosphate group?

    <p>ATP releases energy and becomes ADP</p> Signup and view all the answers

    Which macronutrient has the highest caloric content?

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

    In the ATP-ADP cycle, what is analogous to recharging a reusable gift card?

    <p>Adding a phosphate group to ADP to regenerate ATP</p> Signup and view all the answers

    What is the primary source of energy for producers?

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

    Which type of consumer exclusively eats plants?

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

    What process do consumers use to extract energy from their food?

    <p>Cell respiration</p> Signup and view all the answers

    Which statement accurately describes chemosynthesis?

    <p>It uses non-living sources for energy.</p> Signup and view all the answers

    What distinguishes detritivores from other types of consumers?

    <p>They break down organic matter from dead material.</p> Signup and view all the answers

    What does the numbers pyramid represent in a trophic pyramid?

    <p>Number of organisms at each trophic level</p> Signup and view all the answers

    What percentage of energy is transferred from the primary consumer to the secondary consumer?

    <p>3%</p> Signup and view all the answers

    Which level of the trophic pyramid is considered the producer?

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

    What is the starting source of energy in a trophic pyramid?

    <p>The sun</p> Signup and view all the answers

    Which statement accurately describes the relationship between trophic levels in a food chain?

    <p>Energy decreases as you move up the trophic levels</p> Signup and view all the answers

    What percentage of energy is typically passed from one trophic level to the next?

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

    Which of the following best represents the role of producers in a food chain?

    <p>They convert solar energy into chemical energy.</p> Signup and view all the answers

    What is the primary characteristic of a trophic pyramid?

    <p>It models the distribution of energy availability at each trophic level.</p> Signup and view all the answers

    Which level of the trophic pyramid has the least amount of available energy?

    <p>Quaternary Consumers</p> Signup and view all the answers

    Which statement accurately describes a food web?

    <p>It illustrates multiple interconnected food chains.</p> Signup and view all the answers

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