BIOLOGY
NUCLEIC ACIDS
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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How many different kinds of polypeptides, each composed of 12 amino acids, could be synthesized using the 20 common amino acids?
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412
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1220
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20
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2012
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Explanation:
Detailed explanation-1: -How many different kinds of polypeptides, each composed of 12 amino acids, could be synthesized using the 20 common amino acids? The book’s answer is 2012.
Detailed explanation-2: -Since each of the 20 amino acids is chemically distinct and each can, in principle, occur at any position in a protein chain, there are 20 × 20 × 20 × 20 = 160, 000 different possible polypeptide chains four amino acids long, or 20n different possible polypeptide chains n amino acids long.
Detailed explanation-3: -Therefore making a protein on 50 amino acids long from 20 different amino acids, we get
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