Question 1

Which of the following best describes a catabolic pathway?

Accepted Answer

A pathway that releases energy by breaking down complex molecules into simpler compounds.

Question 2

According to the first law of thermodynamics, which statement is correct?

Accepted Answer

Energy can be transferred and transformed, but cannot be created or destroyed.

Question 3

Which equation correctly represents the change in free energy for a reaction?

Accepted Answer

$$\Delta G = \Delta H - T\Delta S$$

Question 4

A reaction with $$\Delta G \u003c 0 is $$best described as:

Accepted Answer

Exergonic and spontaneous.

Question 5

Which of the following is an example of an endergonic reaction in the human body?

Accepted Answer

Formation of muscle proteins from amino acids.

Question 6

How does ATP typically drive endergonic reactions in cells?

Accepted Answer

By transferring a phosphate group to a reactant, making it more reactive.

Question 7

Which statement about enzymes is correct?

Accepted Answer

Enzymes lower the activation energy ($$E_a) $$required for a reaction.

Question 8

A competitive inhibitor affects enzyme activity by:

Accepted Answer

Binding to the active site and preventing substrate binding.

Question 9

Which of the following factors can influence enzyme activity?

Accepted Answer

Temperature, pH, and the presence of cofactors.

Question 10

In feedback inhibition, the end product of a metabolic pathway:

Accepted Answer

Binds to an allosteric site on an enzyme, shutting down the pathway.

Question 11

Which of the following best illustrates energy coupling in cells?

Accepted Answer

Using the energy released from ATP hydrolysis to drive the synthesis of macromolecules.

Question 12

Which of the following is NOT a function of ATP in the cell?

Accepted Answer

Acting as a structural component of the cell membrane.

Question 13

Which of the following statements about allosteric regulation is true?

Accepted Answer

Allosteric inhibitors stabilize the inactive form of the enzyme.

Question 14

A noncompetitive inhibitor decreases enzyme activity by:

Accepted Answer

Binding to a site other than the active site, causing a conformational change.

Question 15

Which of the following is an example of potential energy in a biological system?

Accepted Answer

The chemical bonds in a glucose molecule.

Question 16

Which statement about the catalytic cycle of an enzyme is correct?

Accepted Answer

The enzyme releases the product and is free to catalyze another reaction.

Question 17

Which of the following is a real-life example of an exergonic reaction?

Accepted Answer

The breakdown of glucose during cellular respiration.

Question 18

If an enzyme's optimal temperature is 37°C, what is likely to happen if the temperature increases to 60°C?

Accepted Answer

The enzyme may denature and lose its activity.

Question 19

Which of the following best describes cooperativity in enzyme regulation?

Accepted Answer

One substrate binding to an active site triggers a shape change that increases activity at other active sites.

Question 20

Which of the following is a correct statement about the second law of thermodynamics?

Accepted Answer

Every energy transfer or transformation increases the entropy (disorder) of the universe.

Chapter 6: An Introduction to Metabolism – General Biology Study Notes

Guida di studio - Domande di pratica