Proteins

Q.

Mark the wrong statement about the denaturation of proteins.

1. Globular proteins are converted into fibrous proteins.

2. The biological activity of the proteins changes.

3. The primary structure of the protein does not change.

4. Fibrous proteins are converted into globular proteins.

Q.

Depreciation arises because of

1. wear and tear

2. fall in the value of the asset

3. Inflation

4. None of the these

Q. Globular proteins are insoluble in water

1. True
2. False

Q.

What is the biological effect of the denaturation of protein?

Q. Calculate the concentration of $N{H}_{3}andN{H}_4^{+}C{l}^{-}$ present in the buffer solution of pH = 9, when total concentration of buffering reagents is 0.6 $mol{L}^{-1}.$ Take $p{K}_b$ for $N{H}_3=4.7,log2=0.3$

1. $\left[N{H}_4^{+}C{l}^{-}\right]=0.1M\text{and}\left[N{H}_3\right]=0.3M$
2. $\left[N{H}_4^{+}C{l}^{-}\right]=0.6M\text{and}\left[N{H}_3\right]=0.6M$
3. $\left[N{H}_4^{+}C{l}^{-}\right]=0.8M\text{and}\left[N{H}_3\right]=0.2M$
4. $\left[N{H}_4^{+}C{l}^{-}\right]=0.4M\text{and}\left[N{H}_3\right]=0.2M$

Q. Protein in silk thread is

1. fibroin
2. keratin
3. albumin
4. globulin

Q.

Define the following as related to proteins:

Denaturation

Q.

Proteins are hydrolysed by enzymes into

1. Dicarboxylic acids

2. Hydroxy acids

3. Amino acids

4. Aromatic acids

Q. Which one of the given proteins transports oxygen in the blood stream?

1. Myoglobin
2. Insulin
3. Albumin
4. Hemoglobin

Q. Lack of which hormone causes Addison’s disease?

1. Glucocorticoids
2. Oxytocin
3. Insulin
4. Norepinephrine

Q.

Which of the following foodstuffs contains nitrogen

1. Proteins

2. Carbohydrates

3. Fats

4. None of these

Q. Which of the following causes denaturation of proteins?

1. Change in $pH$
2. Exposure to heat
3. Exposure to acid or bases
4. None of the above

Q.

Some statements are given below

A) Renaturation is the reverse of denaturation

B) Denaturation may be reversible and irreversible

C) The biological activity is not lost because of denaturation

D) The conjugation of egg white on boiling is a reversible denaturation

The wrong statements are

1. C & D only

2. A & B only

3. A, B, C & D

4. A, B & C only

Q. Lack of which hormone causes Addison’s disease?

1. Glucocorticoids
2. Oxytocin
3. Insulin
4. Norepinephrine