FREE BIOLOGY AND STUDY GAMES ABOUT

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FREE BIOLOGY AND STUDY GAMES ABOUT

MICROBIOLOGY EXAM QUESTIONS

Qs and Ans Expert- Explanation

This Exam contains:

-Guarantee passing score -42 Questions and Answers -format set of multiple-choice -Expert- Explanation Question 1: Classificatioin of viruses are based on:

Answer:

type of nucleic acid, strategy for replication, and morphology

Question 2: _____ must be grown in living cells.

Answer:

Viruses Question 3: A virus with RNA-dependent RNA polymerase:

Answer:

Synthesizes double-stranded RNA from an RNA template.Question 4: A clear area against a confluent "lawn" of bacteria is called a

Answer:

Plaque

Question 5: Host Range

Answer:

refers to the spectrum of host cells in which a virus can multiply

Question 6: Virus genus names end in

Answer:

-virus

Question 7: T/F Viruses contain either DNA or RNA, never both

Answer:

True.

Question 8: Which of the following is not a method of culturing viruses?

Answer:

In culture media

Question 9: Enveloped polyhedral virus

Answer:

Simplexvirus

Question 10: What virus is manysided? Usually the capsid is an icosahedron

Answer:

Polyhedral virus - for example adenovirus Question 11: An example of lysogeny in animals could be:

Answer:

Latent viral infections Question 12: The plaque method mixes:

Answer:

bacteriophages with host bacteria and nutrient agar.

Question 13: Viruses may be indentified by:

Answer:

RFLPs and PCR

Question 14: What test are used most often to identify viruses?.

Answer:

Serological tests Question 15: Which of the following is not used as a criterion to classify viruses?

Answer:

Biochemical tests Question 16: resemble long rods, and their capsids are hollow cylinders surrounding the nucleic acid

Answer:

Helical viruses - for example Ebola virus

Question 17: An infectious protein is a

Answer:

Prion Question 18: Viral size is ascertained by:

Answer:

Electron microscopy

Question 19: An envelope is acquired during which of the following steps?

Answer:

Release Question 20: Each plaque originates with a single viral particle. teh concentration of viruses is

given as:

Answer:

plaque-forming units

Question 21: Which of the following provides the most significant support for the idea that viruses are nonliving chemicals?

Answer:

They cannot reproduce themselves outside of a host.Question 22: Host Range is determined by:

Answer:

the specific attachment site on the host cell's surface and the availbility of host cellular factors

Question 23: Which of the following does not initiate DNA synthesis?

Answer:

A single stranded RNA virus (Togaviridae) Question 24: Cells growing in culture media in the lab are:

Answer:

Cell cultures.Question 25: Place the following in the order in which they are found in a host cell:

• capsid proteins
• infective phage particles
• phage nucleic acid

Answer:

3, 1, 2

Question 26: The ability of a virus to infect an organism is regulated by:

Answer:

the host species, the type of cells, the availability of an attachment site, and cell factors necessary for viral replication Question 27: A complete, fully developed viral particle composed of nucleic acid surrounded by a coat

Answer:

Virion