JEE Main · ChemistryHard

$A polypeptide is composed of 10 amino acids. If the total number of possible isomers is calculated based on the sequence of amino acids, and assuming each position can be occupied by any of the 20 standard amino acids, what is the total number of possible sequences?$

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Correct answer: A — $2 0^{10}$

Solution

$Each of the 10 positions in the polypeptide chain can be filled by any of the 20 standard amino acids.$
$The total number of combinations is the product of the choices for each position.$
$This is calculated as 20 \times 20 \times \dots \times 20 (10 times).$
$Hence the answer is (A).$