Use the Following Information to Answer the Next Few Questions

question 30

Multiple Choice

Use the following information to answer the next few questions.
Poliovirus is a positive-sense RNA virus of the picornavirus group. At its 5' end, the RNA genome has a viral protein (VPg) instead of a 5' cap. This is followed by a nontranslated leader sequence, and then a single long protein coding region (~7000 nucleotides) , followed by a poly-A tail. Observations were made that used radioactive amino acid analogues. Short-period use of the radioactive amino acids result in labelling of only very long proteins, while longer periods of labelling result in several different short polypeptides.
-What conclusion is most consistent with the results of the radioactive labelling experiment?

• A)The host cell cannot translate viral protein with the amino acid analogues.
• B)Host cell ribosomes only translate the viral code into short polypeptides.
• C)The RNA is only translated into a single long polypeptide, which is then cleaved into shorter ones.
• D)The RNA is translated into short polypeptides, which are subsequently assembled into large ones.
• E)The large radioactive polypeptides are coded by the host, whereas the short ones are coded for by the virus.

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Definitions:

Paired Appendages

Structures that extend from the body of an organism and occur in matching pairs, such as wings, arms, and legs.

Watery Habitats

Environments characterized by the presence of water, such as rivers, lakes, wetlands, and oceans, which support a diverse range of life.

Notochord

Stiff rod of connective tissue that runs the length of the body in chordate larvae or embryos.

Tunicates

Marine invertebrates with a sac-like body, filter-feeding mechanism, and notochord during the larval stage; also known as sea squirts.