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In 1971, David Baltimore described a scheme for classifying viruses based on how the virus produces mRNA. Table 17.1 shows the results of testing five viruses (A-E) for nuclease sensitivity , the ability of the viral genome to act as an mRNA, and the presence (+) or absence (-) of each virus's own polymerase. Table 17.1
-Some viruses can be crystallized and their structures analyzed. One such virus is yellow mottle virus, which infects beans. This virus has a single-stranded RNA genome containing about 6,300 nucleotides. Its capsid is 25-30 nm in diameter and contains 180 identical capsomeres. If the yellow mottle virus capsid has 20 facets, how many proteins form each facet?

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Please use the following information to answer the question(s) below.
In 1971, David Baltimore described a scheme for classifying viruses based on how the virus produces mRNA. Table 17.1 shows the results of testing five viruses (A-E) for nuclease sensitivity , the ability of the viral genome to act as an mRNA, and the presence (+) or absence (-) of each virus's own polymerase.  Table 17.1
-Some viruses can be crystallized and their structures analyzed. One such virus is yellow mottle virus, which infects beans. This virus has a single-stranded RNA genome containing about 6,300 nucleotides. Its capsid is 25-30 nm in diameter and contains 180 identical capsomeres. If the yellow mottle virus capsid has 20 facets, how many proteins form each facet?

Quizplus · Accepted Answer

If the capsid has 20 facets, and there are 180 capsomeres in total, then each facet must contain 180/20 = 9 capsomeres. Since each capsomere is identical, each facet must contain 9 copies of the same protein. Therefore, the answer is C) 9.

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