Biology 21 Viruses MCQ


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Photo depicts Earth from space.
This NASA image is a composite of several satellite-based views of Earth. To make the whole-Earth image, NASA scientists combine observations of different parts of the planet. (credit: NASA/GSFC/NOAA/USGS)

Viewed from space, Earth offers no clues about the diversity of life forms that reside there. The first forms of life on Earth are thought to have been microorganisms that existed for billions of years in the ocean before plants and animals appeared. The mammals, birds, and flowers so familiar to us are all relatively recent, originating 130 to 200 million years ago. Humans have inhabited this planet for only the last 2.5 million years, and only in the last 200,000 years have humans started looking like we do today.

Unit 5. Biological Diversity

Chapter 21: Viruses MCQ Multiple Choices Questions Quiz Test Bank

21.1 Viral Evolution, Morphology, and Classification

21.2 Virus Infections and Hosts

21.3 Prevention and Treatment of Viral Infections

21.4 Other Acellular Entities: Prions and Viroids

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Biology 21 Viruses MCQ
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Sample Questions from the Biology 21 Viruses MCQ Quiz

Question: Vaccines_______.


are similar to viroids

are only needed once

kill viruses

stimulate an immune response

Question: Viruses_______.


all have a round shape

cannot have a long shape

do not maintain any shape

vary in shape

Question: Which statement is true of reverse transcriptase?


It is a nucleic acid.

It infects cells.

It transcribes RNA to make DNA.

It is a lipid.

Question: Oncogenic virus cores can be_______.




neither RNA nor DNA

either RNA or DNA

Question: Which statement is true of viral replication?


In the process of apoptosis, the cell survives.

During attachment, the virus attaches at specific sites on the cell surface.

The viral capsid helps the host cell produce more copies of the viral genome.

mRNA works outside of the host cell to produce enzymes and proteins.

Question: The viral ________ plays a role in attaching a virion to the host cell.





both b and c

Question: Which of the following is NOT used to treat active viral disease?



antiviral drugs


phage therapy

Question: Which is true of DNA viruses?


They use the host cell's machinery to produce new copies of their genome.

They all have envelopes.

They are the only kind of viruses that can cause cancer.

They are not important plant pathogens.

Question: Which statement is true?


A virion contains DNA and RNA.

Viruses are acellular.

Viruses replicate outside of the cell.

Most viruses are easily visualized with a light microscope.

Question: A bacteriophage can infect ________.


the lungs




Question: Which statement is not true of viral replication?


A lysogenic cycle kills the host cell.

There are six basic steps in the viral replication cycle.

Viral replication does not affect host cell function.

Newly released virions can infect adjacent cells.

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