$$\text{Glucose} \rightarrow 2 \text{ATP (net)}$$

Question 1

Which property of water is most responsible for its ability to dissolve ionic compounds such as NaCl?

Accepted Answer

Water's polarity and hydrogen bonding

Question 2

A dehydration synthesis reaction between two monosaccharides results in the formation of a disaccharide and which other molecule?

Accepted Answer

A molecule of water $$\mathrm{H_2O}$$

Question 3

Which microscope would be most appropriate for visualizing live, unstained bacteria to observe their motility?

Accepted Answer

Phase-contrast microscope

Question 4

During Gram staining, what is the primary function of the iodine step?

Accepted Answer

To act as a mordant and fix the crystal violet dye

Question 5

A bacterium is placed in a hypertonic solution. What is the most likely outcome?

Accepted Answer

The cell will lose water and shrink (plasmolysis)

Question 6

Which structure is found in both Gram-positive and Gram-negative bacteria, but is thicker in Gram-positive bacteria?

Accepted Answer

Peptidoglycan layer

Question 7

Which specialized bacterial structure allows survival in extreme environmental conditions such as high heat and desiccation?

Accepted Answer

Endospore

Question 8

According to the endosymbiotic theory, which evidence supports the idea that mitochondria originated from prokaryotic cells?

Accepted Answer

Mitochondria have a double membrane and their own circular DNA

Question 9

Which type of microorganism would thrive in an environment with high salt concentration, such as the Dead Sea?

Accepted Answer

Halophile

Question 10

A chemoautotroph obtains energy and carbon by which mechanism?

Accepted Answer

Using inorganic chemicals for energy and $$\mathrm{CO_2$}$$ for carbon

Question 11

Which equation best represents the net ATP yield from glycolysis per molecule of glucose?

Accepted Answer

$$	ext{Glucose} ightarrow 2 	ext{ATP (net)}$$

Question 12

Which factor does NOT directly affect enzyme activity?

Accepted Answer

Cell wall thickness

Question 13

Competitive inhibition of an enzyme occurs when:

Accepted Answer

An inhibitor binds to the enzyme's active site, blocking substrate binding

Question 14

Which physical agent is most effective for sterilizing surgical instruments by destroying all forms of microbial life, including endospores?

Accepted Answer

Autoclave (moist heat under pressure)

Question 15

Which chemical agent kills bacteria primarily by oxidizing cellular components?

Accepted Answer

Hydrogen peroxide

Question 16

Which term describes a procedure or environment that is free from contamination by pathogens?

Accepted Answer

Aseptic

Question 17

During DNA replication, which enzyme is responsible for synthesizing the new DNA strand?

Accepted Answer

DNA polymerase

Question 18

Which process involves the conversion of mRNA into a polypeptide chain?

Accepted Answer

Translation

Question 19

A frameshift mutation is caused by:

Accepted Answer

Insertion or deletion of a base, altering the reading frame

Question 20

In Griffith's experiment, what was the key finding regarding transformation?

Accepted Answer

Non-virulent bacteria acquired virulence when mixed with heat-killed virulent bacteria

Microbiology Study Notes: Chemical Principles, Microscopy, Cell Structure, Metabolism, Microbial Growth, Control of Microbial Growth, and Microbial Genetics

Study Guide - Practice Questions