Q. No.The correct statement about peptides and proteins is :
| 1. | In \(\alpha\)-helices, the polypeptide chain is twisted into a left-handed screw (helix) through intramolecular hydrogen bonds. |
| 2. | Tertiary structure of proteins has two or more polypeptide subunits. |
| 3. | Only the proteins having a quaternary structure are biologically active. |
| 4. | In \(\beta\)-pleated sheet structures, peptide chains are held together by intermolecular hydrogen bonds. |
Subtopic: α - Amino Acids, Peptide Bond, Proteins & Structure |
54%
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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Subtopic: α - Amino Acids, Peptide Bond, Proteins & Structure |
86%
Level 1: 80%+
NEET - 2020
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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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The difference between amylose and amylopectin is:
| 1. | Amylopectin has 1→4 α - linkage and 1→6 α-linkage. |
| 2. | Amylose has 1→4 α-linkage and 1 → 6 β-linkage. |
| 3. | Amylopectin has 1 → 4 α-linkage and 1 → 6 β-linkage. |
| 4. | Amylose is made up of glucose and galactose. |
Subtopic: α - Amino Acids, Peptide Bond, Proteins & Structure |
62%
Level 2: 60%+
NEET - 2018
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Subtopic: α - Amino Acids, Peptide Bond, Proteins & Structure |
73%
Level 2: 60%+
NEET - 2018
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In humans, the main oxygen carrier in the blood is:
1. Hemocyanin
2. Proteins
3. Haemoglobin
4. Both microorganisms and haemoglobin.
Subtopic: α - Amino Acids, Peptide Bond, Proteins & Structure |
88%
Level 1: 80%+
NEET - 2017
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Which of the following statements is not correct?
| 1. | Ovalbumin is a simple food reserve in egg white. |
| 2. | Blood proteins thrombin and fibrinogen are involved in blood clotting. |
| 3. | Denaturation makes the proteins more active. |
| 4. | Insulin maintains the sugar level in the blood of the human body. |
Subtopic: α - Amino Acids, Peptide Bond, Proteins & Structure |
86%
Level 1: 80%+
NEET - 2017
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Which of the following links amino acids together in a protein ?
| 1. | β -glycosidic bond | 2. | Peptide bond |
| 3. | Dative bond | 4. | α -glycosidic bond |
Subtopic: α - Amino Acids, Peptide Bond, Proteins & Structure |
93%
Level 1: 80%+
NEET - 2016
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