Q: Which of the following is the correct LaTeX representation for the calculation of viral titer using a plaque assay?

$$\text{Viral titer} = \frac{\text{Number of plaques}}{\text{Dilution factor} \times \text{Volume plated}}$$

Question 1

Which of the following best describes a virus?

Accepted Answer

An acellular infectious agent that can replicate only within a host cell

Question 2

Who is credited with discovering that yellow fever was transmitted by mosquitoes?

Accepted Answer

Reed

Question 3

Which of the following is NOT a possible form of viral nucleic acid?

Accepted Answer

Triple-stranded DNA

Question 4

The protein structure surrounding the viral genome is called the:

Accepted Answer

Capsid

Question 5

Which of the following is a method used to quantify viruses in a sample?

Accepted Answer

Plaque assay

Question 6

A virus with a host cell-derived plasma membrane surrounding its capsid is described as:

Accepted Answer

Enveloped

Question 7

Which hypothesis suggests that viruses originated from genetic material that gained the ability to replicate and transmit autonomously?

Accepted Answer

Progressive hypothesis

Question 8

Which scientist is credited with describing the tobacco mosaic virus?

Accepted Answer

Beijerinck

Question 9

What is the function of capsomeres in a virus?

Accepted Answer

They are protein subunits that make up the capsid

Question 10

Which of the following is a virus-like particle that replicates in host cells only in the presence of a helper virus and is detrimental to the helper virus?

Accepted Answer

Satellite virus

Question 11

A scientist is using differential centrifugation to purify a viral sample. What is the principle behind this technique?

Accepted Answer

Separation based on the density of viral particles

Question 12

Which of the following is the correct LaTeX representation for the calculation of viral titer using a plaque assay?

Accepted Answer

$$	ext{Viral titer} = \frac{	ext{Number of plaques}}{	ext{Dilution factor} 	imes 	ext{Volume plated}}$$

Question 13

Which classification system groups viruses based on their genome type and replication strategy?

Accepted Answer

Baltimore classification system

Question 14

Which of the following is a real-world example of a virus with an icosahedral capsid symmetry?

Accepted Answer

Adenovirus

Question 15

A plant is infected by an agent composed only of naked RNA, with no protein coat. What is this agent most likely to be?

Accepted Answer

Viroid

Question 16

Which of the following statements about prions is TRUE?

Accepted Answer

Prions are infectious agents composed of protein that can replicate and cause transmissible spongiform encephalopathies

Question 17

Which of the following viruses is known to cause respiratory infections in humans?

Accepted Answer

Respiratory syncytial virus

Question 18

Which scientist is credited with discovering bacteriophages in 1915?

Accepted Answer

Twort

Question 19

Which of the following is a plausible reason why viruses are considered acellular?

Accepted Answer

They lack cellular organelles and cannot carry out metabolism independently

Question 20

A researcher observes that a virus has a segmented genome. Which of the following is a possible advantage of this genome structure?

Accepted Answer

It allows for genetic reassortment, increasing viral diversity

Introduction to Viruses: Structure, Classification, and Quantification

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