Question 1

Which of the following best describes Koch's Postulates and their significance in microbiology?

Accepted Answer

They are a set of criteria used to determine if a specific microorganism causes a specific disease.

Question 2

A scientist observes a new disease in cattle and suspects a bacterial cause. According to Koch's Postulates, what is the next step after isolating the suspected bacterium from a diseased animal?

Accepted Answer

Inoculate a healthy animal with the isolated bacterium and observe if it develops the disease.

Question 3

Which of the following statements about atomic structure is correct?

Accepted Answer

The atomic number is equal to the number of protons in an atom.

Question 4

An atom has 11 protons, 12 neutrons, and 10 electrons. What is its atomic mass?

Accepted Answer

$$11 + 12 = 23$$

Question 5

Which type of chemical bond involves the sharing of electrons equally between two atoms?

Accepted Answer

Nonpolar covalent bond

Question 6

A sodium atom ($$Na) $$loses one electron to become $$Na^+. $$What type of particle is $$Na^+$$?

Accepted Answer

A cation

Question 7

Which of the following best distinguishes a law from a theory in science?

Accepted Answer

A law describes what happens; a theory explains why it happens.

Question 8

Which of the following is NOT a characteristic of all living things?

Accepted Answer

Ability to photosynthesize

Question 9

Which of the following statements about prokaryotic and eukaryotic cells is correct?

Accepted Answer

Eukaryotic cells have membrane-bound organelles; prokaryotic cells do not.

Question 10

Which structure allows bacteria to transfer genetic material directly to another bacterium?

Accepted Answer

Pilus

Question 11

A Gram-negative bacterium is more resistant to certain antibiotics than a Gram-positive bacterium. Which structural feature is primarily responsible for this?

Accepted Answer

The presence of an outer membrane in Gram-negative bacteria

Question 12

Which of the following best describes the function of the bacterial glycocalyx when it is organized as a capsule?

Accepted Answer

It protects the bacterium from phagocytosis by host cells.

Question 13

Which of the following is a correct comparison between dehydration synthesis and hydrolysis?

Accepted Answer

Dehydration synthesis joins monomers by removing water; hydrolysis breaks polymers by adding water.

Question 14

Which of the following is a function of plasmids in bacteria?

Accepted Answer

Carrying genes that may provide antibiotic resistance

Question 15

Which of the following is a correct statement about the nitrogenous bases in DNA and RNA?

Accepted Answer

DNA contains thymine, while RNA contains uracil.

Question 16

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

Accepted Answer

It will lose water and shrink.

Question 17

Which of the following best describes the function of oil in oil immersion microscopy?

Accepted Answer

It increases resolution by reducing light refraction.

Question 18

Which of the following is an example of a polysaccharide used for energy storage in animals?

Accepted Answer

Glycogen

Question 19

Which of the following statements about saturated and unsaturated fats is correct?

Accepted Answer

Saturated fats have no double bonds between carbon atoms; unsaturated fats have one or more double bonds.

Question 20

A student is using a microscope with a 10x ocular lens and a 40x objective lens. What is the total magnification?

Accepted Answer

$$10 	imes 40 = 400$$

Microbiology Foundations: Key Concepts, Cell Structure, Chemistry, and Microscopy

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