Poliovirus is an RNA virus of the picornavirus group, which uses its RNA as mRNA. At its end, the RNA genome has a viral protein (VPg) instead of a 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 labeling of only very long proteins, while longer periods of labeling result in several different short polypeptides. What conclusion is most consistent with the results of the radioactive labeling experiment?
A) Host cell ribosomes only translate the viral code into short polypeptides.
B) The RNA is only translated into a single long polypeptide, which is then cleaved into shorter ones.
C) The RNA is translated into short polypeptides, which are subsequently assembled into large ones.
D) The large radioactive polypeptides are coded by the host, whereas the short ones are coded for by the virus.
Answer: B
You might also like to view...
The first level of inquiry in making a systematic
survey of biodiversity is carried out a. at the ecoregion level. b. among the riparian zones. c. in hot spots. d. at the regional research station. e. on a global scale.
Somatostatin is secreted by
a. pancreatic islet cells. b. the thyroid gland. c. the pituitary gland. d. the adrenal medulla. e. the adrenal cortex
In a single molecule of water, two hydrogen atoms are bonded to a single oxygen atom by _____
A) hydrogen bonds B) nonpolar covalent bonds C) polar covalent bonds D) ionic bonds
Which specialization evolved in land plants to allow for reproduction in dry conditions?
A. Xylem B. Phloem C. Stomata D. Roots E. Sporophyte dominance