BIO 202 Chapter 19: Chapter 19 Learning Objectives
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2.)
a.) Are viruses that infect Archaea different from other bacterial viruses?
Yes, they do not have protein coats because of the extreme conditions where they live. | ||||||||||||
No, they consist of nucleic acid and protein just like other bacterial viruses. | ||||||||||||
Yes, the structure of archaeal viruses is always completely different from other bacterial viruses. | ||||||||||||
Yes, they have only DNA genomes. b.) Of the following examples, which is not a common part of many viral life cycles?
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1. Select all of the true statements regarding phageconversion.
-The incorporation of viral genesinto the host cell's DNA is an example of phage conversion. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
-The expression of the incorporatedgenes and the resulting alteration of the bacterial phenotype is anexample of phage conversion. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
-Cholera toxin genes have a viralorigin. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
-The cholera toxin is produced bythe virus. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
-The cholera toxin itself is transferred to Vibriocholerae by a virus. 2. Viruses grown in media with radioactive sulfur haveradioactive capsids. Why?
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1. A mutation in the gene encoding the integrase enzyme rendersthe protein non-functional. How would the affect the HIV infectioncycle?
Formation of the provirus would bestopped. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Reverse transcription would nolonger be possible. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
The gp120 glycoprotein would nolonger be able to bind to the CCR5 receptor. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Cutting and assembling the capsid would be halted. 2. If the viral gene is AUGCCCAGG and the mRNA used to make theviral protein is UACGGGUCC, then the virus is a :
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