Ch. 21 Quiz

What is the similarity between a virus and a eukaryotic cell? Question 2 options: A.both have a genome B.both have a nucleus C.both have mitochondria D.both have a nuclear membrane

A. Both have a genome

Which virus is sensitive to changes in temperature? Question 4 options: A.HIV B.Poliovirus C.Hepatitis A virus D.Papillomavirus

A. HIV

Which of the following virus morphologies would be the least likely to infect plant or bacterial cells, both of which contain cell walls? Question 9 options: A. Filamentous viruses B. Isometric or icosahedral viruses C. Enveloped viruses D. Head and tail viruses

C. Enveloped viruses

Which viral structure can be seen by a transmission electron microscope? Question 1 options: A.head B.capsid C.genome D.capsomere

B. Capsid

"Wow, these virus capsids are beautiful and amazing!" says your study partner. "This one is like some kind of 1960's geodesic dome, and that one looks like the moon lander. How does a little virus construct these complicated structures?" Question 7 options: A. The shapes arise directly from the shape of the viral DNA or RNA when it is folded up. B. The capsomere proteins bind each other in specific ways, allowing them to self-assemble. C. The host cell has a special organelle that assembles them - this gets the viruses out quicker so the cell can recover. D. The capsids are formed from mitochondria or chloroplasts hijacked from the host.

B. The capsomere proteins bind each other in specific ways, allowing them to self-assemble.

HIV attaches to a person's T lymphocytes to begin multiplying. After HIV attachment to the T lymphocytes, the patient's T lymphocyte immune response decreases. What could be the reason for this? Question 3 options: A.The CD98 marker on T lymphocytes is utilized by HIV for attachment and penetration. B.The CD4 marker on T lymphocytes is utilized by HIV for attachment and penetration. C.The CD8 marker on T lymphocytes is utilized by HIV for attachment and penetration. D.The CD20 marker on T lymphocytes is utilized by HIV for attachment and penetration.

B.The CD4 marker on T lymphocytes is utilized by HIV for attachment and penetration.

Which statement explains why early scientists called viruses "filterable" infectious agents? A. Tobacco mosaic disease could be transferred from a diseased plant to a healthy one via liquid plant extracts. B. The Chamberland-Pasteur filter could remove all viruses visible under a microscope from any liquid sample. C. Liquid extracts passed through the Chamberland-Pasteur filter could still transmit disease. D. Viable bacteria were required to transmit tobacco mosaic disease.

C. Liquid extracts passed through the Chamberland-Pasteur filter could still transmit disease.

In what way are viroids like viruses? Question 10 options: A. They can have capsids and outer envelopes. B. They can have either RNA or DNA. C. They reproduce only within a host cell. D. They do not manufacture any proteins.

C. They reproduce only within a host cell.

You are classifying a novel virus and have the first glance at its sequenced genome. After using a database to identify similar proteins, you discover that it has several protein-coding genes including reverse transcriptase.What kind of virus is it? Question 6 options: A. a dsDNA virus like adenovirus B. a ssDNA virus like parvovirus C. a retrovirus like HIV D. a segmented DNA virus like polydnavirus

C. a retrovirus like HIV

Some viruses cause cancer - even decades after the initial infection. Question 5 options: True False

True