GENETICS AND EVOLUTION
MOLECULAR BASIS OF INHERITANCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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proteins are the only phage components that actually enter the infected cell
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both proteins and nucleic acids enter the cell
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only protein from the infecting phage can also be detected in progeny phage
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only nucleic acids enter the cell
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Detailed explanation-1: -During infection of E. coli cells by bacteriophage T2, only nucleic acids enter the cell, whereas the proteins are left on the outer surface of the bacteria. The protein surface helps the bacteriophage to attach to the surface of E-coli.
Detailed explanation-2: -The phage can attach to the surface of a bacterium using the proteins on its ‘feet’ (tail fibers), and inject its genetic material (either DNA or RNA). This genetic material uses the host cell’s ribosomes to replicate, and synthesize proteins for the capsid and tail of the phage.
Detailed explanation-3: -The DNA of phage T2 (one unit per particle by definition) contains guanine, 5-hydroxymethylcytosine, and relatively large amounts of adenine and thymine, but no cytosine. 4. Infected bacteria contain DNA of a composition that varies systematically during the course of viral growth.
Detailed explanation-4: -T2 phage is more properly called Enterobacteria phage T2. It is a virulent bacteriophage which infects Escherichia coli bacteria. It contains linear double-stranded DNA, and is covered by a protective protein coat. T2 is a ‘tailed phage’, one of a group known as the ‘T4-like viruses’.
Detailed explanation-5: -T2 bacteriophage is a virus that infects bacteria. It has a linear ds DNA (double stranded DNA) as its genetic material in its head.