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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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The capsid of the yellow mottle virus has 180 capsomeres and 20 facets. Therefore, each facet would have 180/20 = 9 capsomeres. Since each capsomere is identical and would be made up of one or more proteins, this means that each facet is composed of 9 identical proteins. Therefore, the best choice is C) 9 proteins.

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