$$\mathrm{ATP} \rightarrow \mathrm{ADP} + \mathrm{Pi} + \text{energy}$$

Question 1

Which of the following best describes how enzymes lower the activation energy of a reaction?

Accepted Answer

By binding substrates, orienting them correctly, and stabilizing the transition state

Question 2

A scientist adds a competitive inhibitor to an enzyme reaction. Which of the following will most likely restore enzyme activity?

Accepted Answer

Adding more substrate

Question 3

Which equation correctly represents the hydrolysis of ATP to release energy?

Accepted Answer

$$\mathrm{ATP} ightarrow \mathrm{ADP} + \mathrm{Pi} + 	ext{energy}$$

Question 4

During aerobic respiration in bacteria, where is the electron transport chain located?

Accepted Answer

Cytoplasmic membrane

Question 5

Which of the following statements about fermentation is correct?

Accepted Answer

Fermentation regenerates NAD$$^+$$ and produces 2 ATP per glucose

Question 6

A metabolic pathway is regulated by feedback inhibition. What happens when the end product accumulates?

Accepted Answer

The first enzyme in the pathway is inhibited, slowing production of the end product

Question 7

Which of the following organisms is most likely to lack both superoxide dismutase and catalase?

Accepted Answer

Obligate anaerobe

Question 8

Which process is responsible for converting CO$$_2$$ into organic molecules during photosynthesis?

Accepted Answer

Calvin cycle

Question 9

A culture of E. coli is grown with oxygen and glucose. Which metabolic pathway will produce the most ATP?

Accepted Answer

Aerobic respiration

Question 10

Which of the following is the most effective method to eradicate endospores in a laboratory solution?

Accepted Answer

Autoclaving

Question 11

Which term best describes a reaction in which the products contain less potential energy than the reactants?

Accepted Answer

Catabolic

Question 12

If a metabolic poison blocks the first electron acceptor in the electron transport chain, what is the most likely outcome?

Accepted Answer

Oxidative phosphorylation is inhibited

Question 13

Which equation correctly represents the oxidation of NADH during cellular respiration?

Accepted Answer

$$\mathrm{NADH} \rightarrow \mathrm{NAD}^+ + 2e^- + 2H^+$$

Question 14

Which group of microbes is most resistant to physical and chemical control methods?

Accepted Answer

Prions

Question 15

During the stationary phase of a bacterial growth curve, what occurs?

Accepted Answer

The number of cells dying equals the number of cells dividing

Question 16

Which of the following best describes the relationship between photosynthesis and respiration?

Accepted Answer

Photosynthesis stores energy, respiration releases it

Question 17

Which of the following is NOT true about noncompetitive inhibition?

Accepted Answer

It can be overcome by adding more substrate

Question 18

Which of the following is a real-world example of a biofilm causing chronic infection?

Accepted Answer

Dental plaque on teeth

Question 19

Which of the following best defines a facultative anaerobe?

Accepted Answer

An organism that can grow without oxygen but grows better with oxygen

Question 20

Which enzyme is responsible for converting hydrogen peroxide into water and oxygen in bacteria?

Accepted Answer

Catalase

Exam 3 Study Guide

Study Guide - Practice Questions