Enzymes (Chapter 6) Gen Bio

Which of the following statements about enzymes is true?

• Enzymes are specific in their actions.

• Enzymes are consumed during chemical reactions.

• Enzymes only function in acidic environments.

• Enzymes alter the equilibrium of chemical reactions.

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What is the primary function of enzymes in biological systems?

• To transport molecules across cell membranes.

• To provide structural support to cells.

• To store energy for future use.

• To regulate metabolic reactions by speeding them up.

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Which of the following statements best describes feedback inhibition?

• It is primarily observed in catabolic pathways.

• It prevents the accumulation of excess end products.

• It activates enzymes at the beginning of a pathway.

• It speeds up metabolic pathways to produce more products.

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Which type of molecule is often used to lower the activation energy of a chemical reaction in biological systems?

• Catalyst

• Substrate

• Inhibitor

• Enzyme

Which term describes the region of an enzyme where the substrate binds and undergoes a chemical reaction?

• Catalyst site

• Allosteric site

• Active site

• Inhibitory site

Activation energy is defined as the:

• Energy released during a chemical reaction.

• Energy required to maintain a reaction at equilibrium.

• Energy needed to initiate a chemical reaction.

• Energy stored in the products of a reaction.

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Feedback inhibition is a form of:

• Competitive inhibition

• Allosteric regulation

• Non-competitive inhibition

• Activation energy reduction

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Which of the following factors can affect the activity of enzymes?

• Enzyme concentration

• Temperature and pH

• Substrate concentration

• All the above

Enzymes are often named by adding which suffix to the substrate they act upon?

• -ase

• -ine

• -ose

• -ide

Which of the following scenarios is NOT an example of feedback inhibition?

• The inhibition of photosynthesis by excess oxygen.

• The control of blood clotting factors in response to injury.

• The regulation of glucose breakdown by insulin and glucagon.

• The inhibition of ATP synthesis when ATP levels are high.

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