Q: Which equation correctly represents the process of photosynthesis?

$$6 \ \mathrm{CO}_2 + 6 \ \mathrm{H}_2\mathrm{O} + \text{energy} \rightarrow \mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6 \ \mathrm{O}_2$$

Question 1

Which of the following best describes the difference between kinetic and potential energy, as illustrated by the images of a lightning storm and a mousetrap with cheese?

Accepted Answer

Kinetic energy is the energy of motion, as seen in lightning, while potential energy is stored energy, as in the set mousetrap.

Question 2

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

Accepted Answer

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

Question 3

The second law of thermodynamics states that every energy transfer increases the entropy of the universe. Which of the following best illustrates this concept?

Accepted Answer

A moose eating a plant and releasing heat during movement.

Question 4

Which equation correctly represents the process of photosynthesis?

Accepted Answer

$$6 \ \mathrm{CO}_2 + 6 \ \mathrm{H}_2\mathrm{O} + 	ext{energy} ightarrow \mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6 \ \mathrm{O}_2$$

Question 5

Which of the following best describes the role of ATP in cellular metabolism?

Accepted Answer

ATP provides energy for cellular work by transferring a phosphate group to other molecules.

Question 6

In the ATP cycle, which process is responsible for regenerating ATP from ADP and inorganic phosphate?

Accepted Answer

Exergonic reactions such as cellular respiration

Question 7

Which of the following statements about enzymes is correct?

Accepted Answer

Enzymes lower the energy of activation by bringing substrates together.

Question 8

A student adds more substrate to a reaction but observes no increase in reaction rate. Which of the following is the most likely explanation?

Accepted Answer

The enzyme is already saturated with substrate.

Question 9

Which of the following best describes feedback inhibition in a metabolic pathway?

Accepted Answer

The end product of the pathway binds to an allosteric site on an enzyme, shutting down the pathway.

Question 10

Which of the following is an example of a coupled reaction in cellular metabolism?

Accepted Answer

The hydrolysis of ATP provides energy for the synthesis of macromolecules.

Question 11

Which of the following graphs best represents the effect of an enzyme on the energy of activation for a chemical reaction?

Accepted Answer

A graph showing a lower peak for the energy of activation in the presence of an enzyme.

Question 12

Which of the following statements about enzyme inhibition is correct?

Accepted Answer

Competitive inhibitors compete with the substrate for the active site.

Question 13

A metabolic pathway consists of several steps, each catalyzed by a different enzyme. What would most likely happen if the enzyme for the second step is nonfunctional?

Accepted Answer

The pathway would stop at the intermediate before the nonfunctional enzyme.

Question 14

Which of the following best explains why enzymes are specific to their substrates?

Accepted Answer

Enzymes have active sites with shapes complementary to their substrates.

Question 15

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

Accepted Answer

The explosion of hydrogen gas: $$2\mathrm{H}_2 + \mathrm{O}_2 \rightarrow 2\mathrm{H}_2\mathrm{O} + \Delta G$$

Question 16

Which of the following conditions would most likely cause an enzyme to denature?

Accepted Answer

A significant increase in temperature beyond the enzyme's optimal range.

Question 17

Which of the following best describes the induced fit model of enzyme function?

Accepted Answer

The enzyme's active site changes shape to better fit the substrate upon binding.

Question 18

Which of the following statements about allosteric regulation is correct?

Accepted Answer

Allosteric activators stabilize the active form of the enzyme.

Question 19

A scientist is studying a metabolic pathway that is regulated by feedback inhibition. If the end product is removed from the system, what is the most likely outcome?

Accepted Answer

The pathway will continue to produce the end product until it accumulates again.

Introduction to Metabolism: Energy, Enzymes, and Cellular Processes

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