Q. No.The RBC deficiency is a deficiency disease of:
1.
Vitamin B1
2.
Vitamin B2
3.
Vitamin B12
4.
Vitamin B6
Consider the following statements:
| a. | Proteins are synthesized by various RNA molecules in the cell and commands for protein synthesis are present in DNA. |
| b. | RNA contains β-D-ribose and DNA contains β-D-2-deoxyribose. |
| c. | RNA contains uracil and DNA contains thymine. |
| d. | RNA molecules are of three types, that is, messenger RNA, ribosomal RNA, and transfer RNA |
The incorrect statement(s) are :
1. a, b and d
2. a, b, c and d
3. a, b and c
4. None of the above.
Consider the following statements.
a. In fibrous protein, polypeptide chains run parallel and are held together by hydrogen and disulphide bonds.
b. Globular protein is formed when polypeptides coil around to give a spherical shape.
c. Globular proteins are insoluble in water but fibrous proteins are soluble in water.
d. Fibrous proteins and globular proteins examples are keratin and albumins respectively.
The incorrect statement is
1. d
2. c
3. b
4. a
Consider the following statements about proteins:
a. Peptide linkage is also known as amide linkage (-CO-NH-)
b. Simply the sequence of amino acids in a polypeptide chain is the primary structure of a protein.
c. During denaturation secondary and tertiary structures are destroyed but the primary structure remains intact.
d. In protein, hydrogen bonds are not disturbed if the protein is subjected to physical change or any chemical change.
The correct statements are-
1. a, d
2. a, d, c
3. a, b, c
4. b, c, d
Monosaccharides are:
| 1. | Carbohydrates that can't be hydrolysed further to give simpler units of polyhydroxy aldehyde or ketone. |
| 2. | Classified on the basis of the number of carbon atoms and the functional group present in them. |
| 3. | The monomers of carbohydrates. |
| 4. | All of the above. |
| Assertion (A) | The two strands of DNA are complementary to each other. |
| Reason (R) | Adenine specifically forms hydrogen bonds with guanine whereas cytosine forms hydrogen bonds with thymine. |
| 1. | Both (A) and (R) are correct and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are correct but (R) is not the correct explanation of (A). |
| 3. | (A) is correct but (R) is incorrect. |
| 4. | Both (A) and (R) are incorrect. |
A nucleoside is different from a nucleotide as:
| Nucleoside | Nucleotide | |
| 1. | Sugar, Protein | Sugar, Protein, Phosphoric acid |
| 2. | Fatty acid, Base | Fatty acid, Base, Phosphoric acid |
| 3. | Sugar, Base | Sugar, Base, Phosphoric acid |
| 4. | Sugar, Base, Phosphoric acid | Sugar, Base |
The denaturation of proteins indicates -
| 1. | The primary structure of a protein is destroyed and the enzyme loses it's activity. |
| 2. | The primary structure of a protein is destroyed and the enzyme enhances it's activity. |
| 3. | The secondary and tertiary structures of a protein are destroyed and the enzyme loses it's activity. |
| 4. | The secondary and tertiary structures of a protein are destroyed and the enzyme enhances it's activity. |
Amino acids exhibit amphoteric behavior as -
1. They can act both as an acid and as a base.
2. They can act only as an acid but not as a base.
3. They can act only as a base but not an acid.
4. None of the above.
α-helix structure of proteins is stabilized by :
| 1. | H-bonds formed between the −SH and C=O group. |
| 2. | H-bonds formed between the −NH and C=O group. |
| 3. | Ionic bonds formed between the −SH and C=O group. |
| 4. | Ionic bonds formed between the −NH and C=O group. |
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