BIOLOGY
PROTEINS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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If a polypeptide contains just 4 amino acids, calculate how many different polypeptides can be created.
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420 = 1, 099, 511, 600, 000
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204 = 160, 000
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Either A or B
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None of the above
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Explanation:
Detailed explanation-1: -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-2: -A tripeptide composed of three different amino acids can be made in 6 different constitutions, and the tetrapeptide shown above (composed of four different amino acids) would have 24 constitutional isomers.
Detailed explanation-3: -For a protein with just 4 amino acids the number of possible combinations rises to
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