Question:
How many tripeptides are possible when following three amino acids make tripeptide? (No amino acid should repeat twice)
(A) Glycine
(B) Alanine
(C) Valine
How many tripeptides are possible when following three amino acids make tripeptide? (No amino acid should repeat twice)
(A) Glycine
(B) Alanine
(C) Valine
Show Hint
Peptide sequences are counted using permutations, not combinations.
Updated On: Jan 25, 2026
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The Correct Option is B
Solution and Explanation
Step 1: Understand tripeptide formation.
A tripeptide consists of three amino acids linked in a specific order.
Order of amino acids matters.
Step 2: Identify the amino acids.
Available amino acids are Glycine (G), Alanine (A) and Valine (V).
No repetition is allowed.
Step 3: Calculate number of possible arrangements.
Number of tripeptides = number of permutations of 3 different amino acids.
\[ = 3! = 6 \]
Step 4: List the possible tripeptides.
GAV, GVA, AGV, AVG, VAG, VGA
A tripeptide consists of three amino acids linked in a specific order.
Order of amino acids matters.
Step 2: Identify the amino acids.
Available amino acids are Glycine (G), Alanine (A) and Valine (V).
No repetition is allowed.
Step 3: Calculate number of possible arrangements.
Number of tripeptides = number of permutations of 3 different amino acids.
\[ = 3! = 6 \]
Step 4: List the possible tripeptides.
GAV, GVA, AGV, AVG, VAG, VGA
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