Question 1

Which of the following best describes the Law of Conservation of Matter as it applies to metabolic reactions?

Accepted Answer

Matter is transformed during metabolic reactions, but the total number of each type of atom remains constant.

Question 2

Which equation correctly represents the balanced hydrolysis of ATP in biological systems?

Accepted Answer

$$\mathrm{ATP} + \mathrm{H_2O} \rightarrow \mathrm{ADP} + \mathrm{H^+} + \mathrm{P_i}$$

Question 3

A patient has a genetic mutation that prevents the entry of ammonia into the urea cycle. What is the most likely consequence?

Accepted Answer

Ammonia will accumulate in the blood, leading to toxicity.

Question 4

Which of the following statements about anabolic and catabolic pathways is correct?

Accepted Answer

Anabolic pathways assemble large molecules from small ones and require energy.

Question 5

Why is stoichiometry important in metabolic reactions?

Accepted Answer

It ensures that the number of atoms of each element is the same on both sides of a reaction.

Question 6

Which of the following is an example of metabolic compartmentalization in eukaryotic cells?

Accepted Answer

Lipid synthesis occurs in the endoplasmic reticulum, while sugar breakdown occurs in the cytoplasm.

Question 7

During fasting, adipocytes (fat-storing cells) highly express genes involved in which process?

Accepted Answer

Lipid breakdown

Question 8

Which of the following best illustrates the theme of interconnectedness in metabolism?

Accepted Answer

There are multiple pathways to synthesize a molecule, allowing flexibility if one pathway is blocked.

Question 9

If a cell is simultaneously breaking down and synthesizing macromolecules in the same compartment, what is the likely outcome?

Accepted Answer

Metabolic chaos and loss of regulation.

Question 10

Which of the following is a correct application of the Law of Conservation of Matter to the photosynthesis reaction?

Accepted Answer

The number of carbon, hydrogen, and oxygen atoms in the reactants equals the number in the products.

Question 11

Which of the following best describes the role of enzymes in metabolic regulation?

Accepted Answer

Enzymes catalyze reactions and can be regulated by modifications such as phosphorylation.

Question 12

A cell needs to synthesize glutamine from α-ketoglutarate. Which of the following statements is correct?

Accepted Answer

The synthesis occurs in multiple steps, each catalyzed by a unique enzyme.

Question 13

Which of the following is a real-world example of metabolic compartmentalization in time?

Accepted Answer

The circadian rhythm separates anabolic and catabolic processes into rest and active periods.

Question 14

Which of the following is a direct consequence of the interconnectedness of metabolic pathways?

Accepted Answer

A block in one pathway can sometimes be bypassed by alternative routes.

Question 15

Which of the following best explains why fertilizers often contain nitrogen and phosphorus?

Accepted Answer

These elements are rarely found in a life-usable form in the environment.

Question 16

Which of the following is a balanced equation for the catabolism of glucose during cellular respiration?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$} + 6\mathrm{O_2$} \rightarrow 6\mathrm{CO_2$} + 6\mathrm{H_2O}$$

Question 17

Which of the following scenarios best demonstrates metabolic flexibility?

Accepted Answer

A cell increases the breakdown of fats and proteins during energy shortage.

Question 18

Which of the following is NOT a major theme of metabolism discussed in the course materials?

Accepted Answer

Randomness

Question 19

Which of the following best describes the relationship between catabolic and anabolic pathways?

Accepted Answer

Catabolic pathways release energy by breaking down molecules, and anabolic pathways use energy to build molecules.

Metabolism: Matter Matters – Key Concepts and Pathways in General Biology

Study Guide - Practice Questions