Which one of the following statements about viruses is correct?
(a) viruses possess their own metabolic system
(b) all viruses contain both RNA and DNA
(c) viruses are obligate parasites
(d) nucleic acid of viruses is known as capsid
Which one of the following statements about viruses is correct?
(a) viruses possess their own metabolic system
(b) all viruses contain both RNA and DNA
(c) viruses are obligate parasites
(d) nucleic acid of viruses is known as capsid
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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. In the past 30 years, gene therapy has beenΓ’ΒΒ¦
a. | used to cure only a handful of diseases |
b. | used to cure 100s of diseases |
c. | incredibly successful |
d. | safe for all patients treated |
2. What is special about the viruses used by researchers to introduce genes into human cells?
a. | they naturally insert DNA into their host cell's genome |
b. | they are larger than most other viruses |
c. | they normally carry human genes that are likely to cause genetic disease |
d. | they only infect cells that are diseased |
3. What is required for gene therapy to work? (Choose ALL correct answers)
[] | the introduced gene must be expressed in the correct cells |
[] | the introduced gene must be expressed in the correct amount |
[] | the introduced gene must be expressed at the correct time |
[] | the introduced gene must be expressed in ALL cells |