How many different kinds of post translational modifications are present in this peptide? [Image]

How many different kinds of post translational modifications are present in this peptide?

Select an option to attempt

1. A
   One
2. B
   Two
3. C
   Four
4. D
   Nine

Correct Answer: Option B

Explanation

Post-translational modifications (PTMs) in the peptide

:From the structural image, the peptide contains two TYPES of post-translational modifications.Common PTMs visible in structural representations:• Phosphorylation (on Ser, Thr, Tyr: addition of –PO₃²⁻)• Glycosylation (addition of sugar moieties)• Acetylation (addition of –COCH₃)• Ubiquitination (addition of ubiquitin chain)• Hydroxylation (addition of –OH)The question asks about distinct KINDS of modifications; the answer is two types of modifications are visible in this peptide.Answer: Two types of PTMs (Option 2).