Question 1

Which scientist is credited with disproving the theory of spontaneous generation using a swan-neck flask experiment, and what was the key outcome of his experiment?

Accepted Answer

Louis Pasteur; he demonstrated that microorganisms do not arise from non-living matter when air is allowed in but dust is excluded.

Question 2

Which of the following is NOT a beneficial activity of microorganisms?

Accepted Answer

Causing infectious diseases in humans

Question 3

According to Koch’s Postulates, which step is essential to link a specific microorganism to a specific disease?

Accepted Answer

The microorganism must be isolated from a diseased organism and grown in pure culture.

Question 4

Which of the following statements best describes the difference between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells have a nucleus, while prokaryotic cells lack a nucleus.

Question 5

Which domain includes organisms that can survive in extreme environments such as hot springs, salt lakes, and acidic habitats?

Accepted Answer

Domain Archaea

Question 6

What is the correct scientific name format for the bacterium that causes tuberculosis?

Accepted Answer

$$Mycobacterium\ tuberculosis$$

Question 7

Which of the following is a characteristic used in classifying bacteria?

Accepted Answer

Cell wall composition

Question 8

What is the main difference between Bergey’s Manual of Determinative Bacteriology and Bergey’s Manual of Systematic Bacteriology?

Accepted Answer

Determinative is used for identification based on observable traits, while Systematic is used for classification based on evolutionary relationships.

Question 9

A bacterial cell is placed in a hypertonic solution. What will most likely happen to the cell?

Accepted Answer

The cell will lose water and undergo plasmolysis.

Question 10

Which component is found in the cell wall of Gram-negative bacteria but not in Gram-positive bacteria?

Accepted Answer

Lipopolysaccharide (LPS) layer

Question 11

Which structure allows bacteria to adhere to surfaces and is involved in the formation of biofilms, but is not used for motility?

Accepted Answer

Fimbriae

Question 12

Which of the following statements about endospores is TRUE?

Accepted Answer

Endospores are resistant to heat, desiccation, and chemicals due to their multiple protective layers.

Question 13

Which type of bacterial motility involves movement without the use of flagella, and is often seen in Myxobacteria?

Accepted Answer

Gliding motility

Question 14

Which of the following best describes the function of an enzyme in a biochemical reaction?

Accepted Answer

Enzymes decrease the activation energy, speeding up the reaction.

Question 15

Which of the following is an example of a competitive inhibitor?

Accepted Answer

A molecule that binds to the active site, preventing substrate binding.

Question 16

Which pathway is the first step in both fermentation and respiration of glucose in bacteria?

Accepted Answer

Glycolysis

Question 17

What is the net ATP yield from fermentation of one molecule of glucose?

Accepted Answer

$$2$$

Question 18

Which equation correctly represents aerobic respiration of glucose?

Accepted Answer

$$C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O + 38ATP$$

Question 19

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

Accepted Answer

O$$_2$$

Question 20

Which of the following best explains why ATP production in glycolysis is called substrate-level phosphorylation?

Accepted Answer

ATP is produced by transferring a phosphate group from a substrate molecule to ADP.

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