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 |
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. |
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.
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. |
The term glycosidic linkage means :
1. | Two monosaccharide units bonded by an oxygen atom. |
2. | Two monosaccharide units bonded by a sulphur atom. |
3. | Two peptide units bonded by an oxygen atom. |
4. | Two peptide units bonded by an hydrogen atom. |
Reducing sugars are -
1. | Carbohydrates that reduce Fehling’s solution and Tollen’s reagent. |
2. | Carbohydrates that reduce only Tollen’s reagent. |
3. | Carbohydrates that reduce only Fehling’s solution . |
4. | Carbohydrates that reduce HI |
The helical structure of a protein is stabilized by:
1. | Hydrogen bonds | 2. | Ether bonds |
3. | Peptide bonds | 4. | Dipeptide bonds |