Q: Which of the following reactions is an example of a redox reaction?

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

Question 1

Which of the following best describes the difference between a heterotroph and an autotroph?

Accepted Answer

Heterotrophs obtain carbon from organic compounds, while autotrophs obtain carbon from carbon dioxide ($$CO_2).$$

Question 2

Which of the following is an example of a growth factor for microorganisms?

Accepted Answer

Amino acids

Question 3

A bacterium is placed in a solution where the concentration of solutes outside the cell is lower than inside. What type of solution is this, and what is the likely outcome for the cell?

Accepted Answer

Hypotonic; the cell will swell and may burst due to water influx.

Question 4

Which process requires energy input and moves molecules against their concentration gradient?

Accepted Answer

Active transport

Question 5

Which form of endocytosis involves the engulfment of large solid particles by a cell?

Accepted Answer

Phagocytosis

Question 6

Which category of microorganisms requires oxygen for growth and cannot survive without it?

Accepted Answer

Obligate aerobes

Question 7

During binary fission, a bacterial cell divides into two daughter cells. If a population starts with 1 cell and doubles every 30 minutes, how many cells will there be after 3 hours?

Accepted Answer

64

Question 8

Which of the following best describes the lag phase in a population growth curve?

Accepted Answer

Cells are metabolically active but not dividing rapidly.

Question 9

Which statement about enzymes is correct?

Accepted Answer

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

Question 10

Which of the following is an example of a cofactor that assists enzyme activity?

Accepted Answer

Iron ($$Fe^{2+})$$

Question 11

What is the main difference between exoenzymes and endoenzymes?

Accepted Answer

Exoenzymes function outside the cell, while endoenzymes function inside the cell.

Question 12

Which type of enzyme regulation involves a molecule binding to a site other than the active site, causing a change in enzyme activity?

Accepted Answer

Allosteric inhibition

Question 13

Which of the following reactions is an example of a redox reaction?

Accepted Answer

$$C_6H_{12}O_6$ + 6O_2 ightarrow 6CO_2 + 6H_2O + 	ext{Energy}$$

Question 14

Which process in microbial metabolism directly generates ATP by transferring a phosphate group from a substrate to ADP?

Accepted Answer

Substrate-level phosphorylation

Question 15

During aerobic respiration, what is the final electron acceptor in the electron transport chain?

Accepted Answer

Oxygen ($$O_2)$$

Question 16

Which metabolic pathway is common to both aerobic and anaerobic respiration, as well as fermentation?

Accepted Answer

Glycolysis

Question 17

In fermentation, which molecule is typically reduced to regenerate NAD$$^+$$, allowing glycolysis to continue?

Accepted Answer

Pyruvate

Question 18

Which of the following best explains why ATP yields can vary in aerobic respiration?

Accepted Answer

Some energy is lost as heat and not all NADH/FADH$$_2$$ are used for ATP synthesis.

Question 19

Which stage of photosynthesis uses ATP and NADPH to fix carbon dioxide ($$CO_2) $$into glucose?

Accepted Answer

Calvin cycle (light-independent reactions)

Question 20

A mutation causes a bacterium to lose the ability to produce ATP synthase. Which process would be most directly affected?

Accepted Answer

Oxidative phosphorylation

Microbial Nutrition and Metabolism: Study Notes for Microbiology

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