1
Which amino acid is present in highest concentration in actin?
EXPLANATION
Muscle Structure, Contractile Proteins, Fiber
- Actin Polypeptide Composition:
- Actin is an abundant, highly conserved eukaryotic myofibrillar contractile protein (molecular weight $\approx 42\text{ kDa}$, 375 amino acid residues).
- Primary sequence analysis shows that small, flexible amino acid residues are highly represented to support globular folding (G-actin) and polymerization into microfilaments (F-actin), with Glycine occurring in exceptionally high concentration (over 28 residues, $\approx 7.5\%$ of total amino acids).
- nalysis:
- (Glycine): Correct.
Correct option: (3) Glycine
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