Biomolecules — Page 7 | NEET Chemistry

Q61

The non-essential amino acid among the following is :

A alanine

B lysine

C valine

D leucine

Correct Answer

Option A

Solution

Non Essential amino acid is Alanine.

Q62

The difference between amylose and amylopectin is

A amylopectin have 1

\to

4

\alpha

-linkage and 1

\to

6

\alpha

-linkage

B amylose have 1

\to

4

\alpha

-linkage and 1

\to

6

\beta

-linkage

C amylopectin have 1

\to

4

\alpha

-linkage and 1

\to

6

\beta

-linkage

D amylose is made up of glucose and galactose

Correct Answer

Option A

Solution

Amylose and amylopectin are polymers of $\alpha$ -D-glucose, so $\beta$ -link is not possible.

Amylose is linear with 1 $\to$ 4 $\alpha$ -linkage whereas amylopectin is branched and has both 1 $\to$ 4 and 1 $\to$ 6 $\alpha$ -linkages.

Q63

Which of the following statements is not correct?

A Ovalbumin is a simple food reserve in egg-white.

B Blood proteins thrombin and fibrinogen are involved in blood clothing.

C Denaturation makes the proteins more active.

D Insulin maintains sugar level in the blood of a human body.

Correct Answer

Option C

Solution

Denaturation changes the structure of a protein and protein loses its activity.

Q64

The central dogma of molecular genetics states that the genetic information flows from

A Amino acids

\to

Proteins

\to

DNA

B DNA

\to

Carbohydrates

\to

Proteins

C DNA

\to

RNA

\to

Proteins

D DNA

\to

RNA

\to

Carbohydrates

Correct Answer

Option C

Solution

The central dogma of molecular genetics is DNA

\overset{{Transcription}}\longrightarrow

RNA

\overset{{Translation}}\longrightarrow

Proteins

Q65

The correct statement regarding RNA and DNA, respectively is

A The sugar component in RNA is a arabinose and the sugar component in DNA is ribose

B The sugar component in RNA is 2'-deoxyribose and the sugar component in DNA is arabinose

C the sugar component in RNA is arabinose and the sugar component in DNA is 2'-deoxyibose

D the sugar component in RNA is ribose and the sugar component in DNA is 2'-deoxyribose.

Correct Answer

Option D

Solution

Sugar in DNA is 2'-deoxyribose whereas sugar in RNA is ribose.

Q66

In a protein molecule various amino acids are linked together by

A peptide bond

B dative bond

C

\alpha

-glycosidic bond

D

\beta

-glycosidic bond.

Correct Answer

Option A

Solution

In a protein molecule various amino acids are linked together by peptide bond.

Q67

Which of the following hormones is produced under the condition of stress which simulate glycogenlysis in the liver of human beings?

A Thyroxin

B Insulin

C Adrenaline

D Estradiol

Correct Answer

Option C

Solution

Adrenaline is a hormone produced by adrenal glands during high stress or exciting situations.

This powerful hormone is part of the human body’s acute stress response system, also called the fight or flight response

Q68

In DNA, the linkages between different nitrogenous bases are

A phosphate linkage

B H-bonding

C glycosidic linkage

D peptide linkage

Correct Answer

Option B

Solution

Nitrogeneous bases are linked together by hydrogen bonds.

Q69

Deficiency of vitamin B 1 causes the disease

A convulsions

B beri-beri

C cheilosis

D sterility

Correct Answer

Option B

Solution

Deficiency of vitamin B 1 causes Beri-beri.

Q70

Which one of the following sets of monosaccharides forms sucrose?

A

\alpha

-

D

-galactopyranose and

\alpha

-

D

glucopyranose

B

\alpha

-

D

-glucopyranose and

\beta

-

D

fructofuranose

C

\beta

-

D

-glucopyranose and

\alpha

-

D

fructofuranose

D

\alpha

-

D

-glucopyranose and

\beta

-

D

fructopyranose

Correct Answer

Option B

Solution

Sucrose is formed by the condensation of $\alpha$ -D-glucopyranose and $\beta$ -D-fructofuranose.