7
Given below are two statements
Statement (I) : The amino acid residues in protein molecule are exclusively L-stereoisomers.
Statement (II) : All the L-amino acids are levorotatory i.e., rotating light to the left
In light of the above statements, choose the most appropriate answer from the options given below.
EXPLANATION
Amino Acids, Peptides, & Proteins
- Statement (I) is True: Ribosomal translation in all living organisms incorporates exclusively L-stereoisomers of $\alpha$-amino acids into polypeptide chains.
- Statement (II) is False: The "L" descriptor designates absolute configuration relative to L-glyceraldehyde, not the direction of optical rotation. While all protein amino acids are L-configured, some rotate plane-polarized light to the right (dextrorotatory, $+$, e.g., L-alanine, L-isoleucine, L-glutamate) and others to the left (levorotatory, $-$) in neutral aqueous solutions.
- Conclusion: Statement (I) is true but Statement (II) is false.
Correct option: (3) Statement (I) is true but Statement (II) is false.
Explanation not matching this question?
क्या व्याख्या इस प्रश्न से मेल नहीं खा रही?
Report
Want to practice this paper in exam conditions?
क्या आप परीक्षा जैसे माहौल में अभ्यास करना चाहते हैं?
Test yourself in 5-question batch format with timer and hidden answers.
5-प्रश्नों के बैच फॉर्मैट, टाइमर और छिपे उत्तरों के साथ खुद को परखें।
Start Practice Mode →
प्रैक्टिस टेस्ट मोड शुरू करें →