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. |
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.
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. |
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. |
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 |
-D-glucose and β-D-glucose are:
1. Epimers
2. Anomers
3. Functional isomers
4. Chain isomers
The incorrect statement about nucleic acid is:
1. | It is responsible for heredity. |
2. | It is responsible for protein synthesis in a cell. |
3. | It is a constituent of the chromosome. |
4. | It is responsible for the transmission of chemical signals. |
D-Glucose \(\xrightarrow[]{\textbf{?}}\) Saccharic acid
The oxidizing reagent used for this conversion is:
1. HI
2. Bromine water
3. HNO3
4. H2SO4
Examples of globular proteins are:
(a) | Insulin | (b) | Keratin |
(c) | Albumin | (d) | Myosin |
Choose the correct option :
1. (a) and (b)
2. (b) and (c)
3. (c) and (d)
4. (a) and (c)