Understanding Biochemical Reactions and Energy

What is a biochemical reaction?

• A reaction that occurs only in non-living things

• A reaction that involves the transformation of substances within living organisms

• A reaction that does not involve any energy changes

• A reaction that only occurs in the presence of light

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Which of the following best describes the role of energy in a biochemical reaction?

• Energy is not required at any stage of the reaction

• Energy is only required at the beginning of the reaction

• Energy is required to break bonds in reactants and form new bonds in products

• Energy is only released at the end of the reaction

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What is the term for the minimum amount of energy needed to start a biochemical reaction?

• Activation energy

• Kinetic energy

• Potential energy

• Thermal energy

How do enzymes affect biochemical reactions in living organisms?

• They increase the activation energy required

• They decrease the activation energy required

• They do not affect the activation energy

• They stop the reaction from occurring

Which of the following is an example of a biochemical reaction?

• Rusting of iron

• Photosynthesis in plants

• Melting of ice

• Boiling of water

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What happens to the energy in a biochemical reaction when bonds are broken in the reactants?

• Energy is absorbed

• Energy is released

• Energy remains unchanged

• Energy is destroyed

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What is the role of enzymes in the human digestive system?

• They slow down the digestion process

• They speed up the digestion process

• They have no role in digestion

• They convert food into energy directly

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Which of the following statements is true about enzymes?

• Enzymes are consumed in the reaction they catalyze

• Enzymes are reusable and not consumed in the reaction

• Enzymes can only catalyze one reaction

• Enzymes work best at any temperature

• Energy is released in the form of heat

• Energy is absorbed from sunlight

• Energy is not involved

• Energy is released in the form of light

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What is the importance of enzymes to living organisms?

• They provide energy for biochemical reactions

• They act as catalysts to speed up biochemical reactions

• They are the main source of nutrients

• They store genetic information

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