$$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} \rightarrow \mathrm{ADP} + \mathrm{P_i} + \text{energy}$$

Question 1

Which type of reaction provides energy for a second reaction that requires energy in cellular metabolism?

Accepted Answer

a coupled reaction

Question 2

ATP can be broken down into which of the following products?

Accepted Answer

ADP plus phosphate plus energy

Question 3

Which statement best describes metabolic pathways?

Accepted Answer

Metabolic pathways often intersect one another

Question 4

During an enzymatic reaction, what happens to the enzyme and substrate?

Accepted Answer

The enzyme and substrate form a temporary complex

Question 5

Which statement is true about energy of activation?

Accepted Answer

Adding the correct enzyme can lower the energy of activation

Question 6

Enzyme activity in a metabolic pathway is most likely to stop under which condition?

Accepted Answer

as soon as a critical level of end product builds up

Question 7

Which of the following will increase enzyme activity?

Accepted Answer

change to optimum pH for the reaction

Question 8

Which of the following is a true statement regarding oxidation reactions?

Accepted Answer

A reaction is considered an oxidation reaction when electrons are lost

Question 9

Most enzymes are composed of which type of biological molecule?

Accepted Answer

proteins

Question 10

Which cellular pathway produces the majority of ATP in aerobic respiration?

Accepted Answer

electron transport chain and chemiosmosis

Question 11

Which statement about fermentation is NOT true?

Accepted Answer

Fermentation requires an input of carbon dioxide

Question 12

A patient is exposed to a metabolic poison that inhibits ATP synthase. Which process will be most directly affected?

Accepted Answer

Production of ATP during chemiosmosis

Question 13

Which equation correctly represents the hydrolysis of ATP?

Accepted Answer

$$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} ightarrow \mathrm{ADP} + \mathrm{P_i} + 	ext{energy}$$

Question 14

In a metabolic pathway, what is the role of feedback inhibition?

Accepted Answer

It prevents the overproduction of the end product by inhibiting an earlier enzyme

Question 15

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

Accepted Answer

The active site of the enzyme has a unique shape that fits only specific substrates

Question 16

A scientist increases the temperature of an enzyme-catalyzed reaction to 100°C. What is the most likely outcome?

Accepted Answer

The enzyme will denature and lose activity

Question 17

Which process in cellular respiration directly produces carbon dioxide?

Accepted Answer

Citric acid cycle (Krebs cycle)

Question 18

If a cell is deprived of oxygen, which pathway will continue to function?

Accepted Answer

Glycolysis

Question 19

Which of the following is a correct description of substrate-level phosphorylation?

Accepted Answer

Direct transfer of a phosphate group from a substrate to ADP to form ATP

Question 20

A mutation causes an enzyme to lose its ability to bind its substrate. Which part of the enzyme is most likely affected?

Accepted Answer

The active site

Metabolic Pathways, Enzymes, and Cellular Energy in Microbiology

Study Guide - Practice Questions