1. Which statement about viral RNA genomes is correct? dsRNA genomes can be dire

ID: 141766 • Letter: 1

Question

1. Which statement about viral RNA genomes is correct?

dsRNA genomes can be directly translated to make viral protein

RNA genomes can be copied by host cell RNA-dependent RNA polymerases

(+) ssRNA virus replication cycles do not require a (-) strand intermediate

(+) ssRNA genomes may be translated to make viral protein

All of the above

2. Which of the following is absent from host cell mRNA exported into the cytoplasm from the nucleus?

introns

3 poly(A) tail

codons

5 7-methylguanylate cap

3. Which of the following is NOT a characteristic of eukaryotic translation?

initiation requires a 5 7-methylguanylate cap

UGA is one of three termination codons

host machinery can recognize polycistronic RNAs

the complete ribosome is made up of 40S and 60S subunits

dsRNA genomes can be directly translated to make viral protein

RNA genomes can be copied by host cell RNA-dependent RNA polymerases

(+) ssRNA virus replication cycles do not require a (-) strand intermediate

(+) ssRNA genomes may be translated to make viral protein

All of the above

1.Correct answer would be:(+) ssRNA genomes may be translated to make viral protein.

Reason: + ssRNA can act as a messenger RNA and thus can be translated into proteins inside the host cell.

2.Correct answer would be: introns

Reason:Introns that are non coding regions of pre mRNA are removed from the pre mRNA when it is present in the nucleus via process known as splicing.

3.Correct answer would be:host machinery can recognize polycistronic RNAs.

Reason: Host machinery in eukaryotes can recognize only monocistronic RNAs and not monocistronic RNAs that are specific to prokaryotes.

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