Discussion
Viral capsids are built from many copies of a few proteins because this
Answer: D
Correct answer: needs only a small amount of genetic information
A virus has very little genome to spare, and building a shell from many copies of one or a few proteins means encoding only those few. The subunits then assemble by self-assembly into a symmetrical structure - helical or icosahedral - without any instructions beyond their own shape. It is genetic economy, and it is why viral capsids show such regular geometry.
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