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Q. No.
The correct statement about peptides and proteins is :
 
1. In α-helices, the polypeptide chain is twisted into a left-handed helix and stabilized by intramolecular hydrogen bonds.
2. The tertiary structure of proteins has two or more polypeptide subunits
3. Only proteins having a quaternary structure are biologically active.
4.
In β-pleated sheet structures, peptide chains are held together by intermolecular hydrogen bonds.
Subtopic:  α - Amino Acids, Peptide Bond, Proteins & Structure |
 51%
Level 3: 35%-60%
NEET - 2026
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The amino acid that gives a red-blood colour on treating its sodium fusion extract with sodium nitroprusside is:
 
1. serine 2. leucine
3. threonine 4. methionine
Subtopic:  α - Amino Acids, Peptide Bond, Proteins & Structure |
Level 3: 35%-60%
NEET - 2026
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Which of the following is a basic amino acid?

1. Alanine 2. Tyrosine
3. Lysine 4. Serine
Subtopic:  α - Amino Acids, Peptide Bond, Proteins & Structure |
 86%
Level 1: 80%+
NEET - 2020
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The non-essential amino acid among the following is:

1. Lysine 2. Valine
3. Leucine 4. Alanine
Subtopic:  α - Amino Acids, Peptide Bond, Proteins & Structure |
 68%
Level 2: 60%+
NEET - 2019
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Which structure(s) of proteins remains(s) intact during denaturation process?

1. Both secondary and tertiary structures

2. Primary structure only

3. Secondary structure only

4. Tertiary structure only

Subtopic:  α - Amino Acids, Peptide Bond, Proteins & Structure |
 83%
Level 1: 80%+
NEET - 2019
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