Discussion
The higher order structure of DNA shows symmetry, whereas the higher order structures of most proteins do not. Why isn't protein shape more regular like DNA?
Answer: D
Correct answer: All of the above
All three statements bear on it. DNA is essentially one molecule doing one job - storing sequence - so a single regular structure suffices, while proteins do thousands of different jobs. And the reason they can is chemical: the twenty different R groups, some charged, some hydrophobic, some (like proline) forcing a bend, let the chain fold into an enormous variety of shapes. DNA’s four bases, all of similar shape and all paired the same way, allow no such variation.
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