QUESTION al Nucleases are enzymes that degrade (break down) nucleic acids: DNAse

Question

QUESTION al Nucleases are enzymes that degrade (break down) nucleic acids: DNAses degrade DNA and RNAses degrade RNA. Polymerases polymers (for example nucleic acids). The table below shows the results of testing four viruses for nuclease sensitivity and the presence (+) or absence (-) of polymerase activity. NA DNA are enzymes that build (4 marks) Nucleic acid Has enzyme with degraded by polymerase activity Virus DNase RNase DNase RNase Based on the above table, which virus is likely to be a retrovirus (choose one (0) (i) Based on the above table, which virus is likely to be a bacteriophage (choose nse m A-D one from A-D)? DNAi

Explanation / Answer

i.Virus D is likely to be the Retrovirus

All retroviral RTs have both DNA polymerase and RNase H activities

Reverse transcriptase transcribes RNA into deoxyribonucleic acid DNA a process that constitutes a reversal of the usual direction of cellular transcription (DNA into RNA). The action of reverse transcriptase makes it possible for genetic material from a retrovirus to become permanently incorporated into the DNA genome of an infected cell; the enzyme is widely used in the biological sciences to synthesize genes

Virus C is likely to be the Bacteriophage

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