BITSAT 2024
- Exam
- BITSAT
- Year
- 2024
- Subject
- Chemistry
- Chapter
- Biomolecules
BITSAT 2024 · Chemistry · Biomolecules
A tetrapeptide is made of naturally occuring alanine, serine,...
A tetrapeptide is made of naturally occuring alanine, serine, glycine and valine. If the -terminal amino acid is alanine and N -terminal amino acid is chiral, the number of possible sequence of the tetrapeptide is
Options
- A4
- B8
- C6
- D12
Correct answer
A. 4
Step-by-step solution
Since glycine (gly) is achiral, alanine (Ala) is the C-terminal amino acid, therefore N -terminal amino acid can be valine (val) or serine (ser). In the view of these condition, the following four sequences for the tetrapeptide is possible.
(i) Val-gly-Ser-Ala
(ii) Val-Ser-gly-Ala
(iii) Ser-gly-Val-Ala
(iv) Ser-Val-gly-Ala