NEET > Biomolecules

Explore popular questions from Biomolecules for NEET. This collection covers Biomolecules previous year NEET questions hand picked by popular teachers.


Q 1.    

Correct4

Incorrect-1

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 clotting.

Denaturation makes the proteins more active.

D

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

Explanation

Q 2.    

Correct4

Incorrect-1

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

A

Amino acids {tex} \rightarrow {/tex} Proteins {tex} \rightarrow {/tex} DNA

B

{tex} \mathrm { DNA } \rightarrow {/tex} Carbohydrates {tex} \rightarrow {/tex} Proteins

{tex} \mathrm { DNA } \rightarrow \mathrm { RNA } \rightarrow {/tex} Proteins

D

{tex} \mathrm { DNA } \rightarrow \mathrm { RNA } \rightarrow {/tex} Carbohydrates

Explanation

Q 3.    

Correct4

Incorrect-1

The correct corresponding order of names of four aldoses with configuration given below

A

L-erythrose, {tex} L {/tex} -threose, {tex} L {/tex} -erythrose,

B

{tex} D {/tex} -threose, {tex} D {/tex} -erythrose, {tex} L {/tex} -threose,{tex} L {/tex} - erthrose

C

L-erythrose, {tex} L {/tex} -threose, {tex} D {/tex} -erythrose,{tex} D {/tex} - Threose

{tex} D {/tex} -erythrose, {tex} D {/tex} -threose, {tex} L {/tex} -erythrose,{tex} L {/tex} -Threose.

Explanation



Q 4.    

Correct4

Incorrect-1

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 {tex} 2 ^ { \prime } {/tex} -deoxyribose and the sugar component in DNA is arabinose

C

the sugar component in RNA is arabinose and the sugar component in DNA is {tex} 2 ^ { \prime } {/tex} -deoxyribose

the sugar component in RNA is ribose and the sugar component in DNA is {tex} 2 ^ { \prime } {/tex} -deoxyribose.

Explanation

Q 5.    

Correct4

Incorrect-1

In a protein molecule various amino acids are linked together by

peptide bond

B

dative bond

C

{tex} \alpha {/tex} -glycosidic bond

D

{tex}\beta{/tex}-glycosidic bond.

Explanation

Q 6.    

Correct4

Incorrect-1

Which one given below is a non-reducing sugar?

A

Glucose

Sucrose

C

Maltose

D

Iactose

Explanation

Q 7.    

Correct4

Incorrect-1

{tex} D ( + ) {/tex} -glucose reacts with hydroxyl amine and yields an oxime. The structure of the oxime would be

A

B

C

Explanation



Q 8.    

Correct4

Incorrect-1

Which of the following hormones is produced under the conditions of stress which stimulate glycogenolysis in the liver of human beings?

A

Thyroxin

B

Insulin

Adrenaline

D

Estradiol

Explanation



Q 9.    

Correct4

Incorrect-1

In DNA, the linkages between different nitrogenous bases are

A

phosphate linkage

H-bonding

C

glycosidic linkage

D

peptide linkage

Explanation

Q 10.    

Correct4

Incorrect-1

Deficiency of vitamin {tex} \mathrm { B } _ { 1 } {/tex} causes the disease

A

convulsions

beri-beri

C

cheilosis

D

sterility

Explanation

Q 11.    

Correct4

Incorrect-1

Which one of the following sets of monosaccharides forms sucrose?

A

{tex} \alpha - D {/tex} -galactopyranose and {tex} \alpha - D {/tex} glucopyranose

{tex} \alpha - D - {/tex} glucopyranose and {tex} \beta - D - {/tex} fructofuranose

C

{tex} \beta - D {/tex} -glucopyranose and {tex} \alpha - D {/tex} -fructofuranose

D

{tex} \alpha - D - {/tex} glucopyranose and {tex} \beta - D - {/tex} fructopyranose

Explanation

Q 12.    

Correct4

Incorrect-1

Which one of the following statements is not true regarding {tex} ( + ) {/tex} lactose?

A

On hydrolysis (+) lactose gives equal amount of {tex} \mathrm { D } ( + ) {/tex} glucose and {tex} \mathrm { D } ( + ) {/tex} galactose.

B

(+) Lactose is a {tex} \beta {/tex} -glucoside formed by the union of a molecule of {tex} \mathrm { D } ( + ) {/tex} glucose and a molecule of {tex} \mathrm { D } ( + ) {/tex} galactose.

(+) Lactose is a reducing sugar and does not exihibit mutarotation.

D

(+) Lactose, {tex} \mathrm { C } _ { 12 } \mathrm { H } _ { 22 } \mathrm { O } _ { 11 } {/tex} contains {tex} 8 - \mathrm { OH } {/tex} groups

Explanation

Q 13.    

Correct4

Incorrect-1

Which of the following is not a fat soluble vitamin?

Vitamin B complex

B

Vitamin D

C

Vitamin {tex} \mathrm { E } {/tex}

D

Vitamin {tex} \mathrm { A } {/tex}

Explanation

Q 14.    

Correct4

Incorrect-1

Which of the statements about "Denaturation" given below are correct?
(1) Denaturation of proteins causes loss of
secondary and tertiary structures of the protein.
(2) Denaturation leads to the conversion of double strand of DNA into single strand.
(3) Denaturation affects primary structure which gets distorted.

A

(2) and {tex} ( 3 ) {/tex}

B

(1) and (3)

(1) and {tex} ( 2 ) {/tex}

D

(1), {tex} ( 2 ) {/tex} and {tex} ( 3 ) {/tex}

Explanation

Q 15.    

Correct4

Incorrect-1

Which one of the following does not exhibit the phenomenon of mutarotation?

(+) Sucrose

B

(+) Lactose

C

(+) Maltose

D

(-) Fructose

Explanation







Q 16.    

Correct4

Incorrect-1

Fructose reduces Tollen's reagent due to

A

asymmetric carbons

B

primary alcoholic group

C

secondary alcoholic group

enolisation of fructose followed by conversion to aldehyde by base

Explanation





Q 17.    

Correct4

Incorrect-1

The segment of DNA which acts as the instrumental manual for the synthesis of the protein is

A

ribose

gene

C

nucleoside

D

nucleotide.

Explanation

Q 18.    

Correct4

Incorrect-1

Which of the following hormones contains iodine?

A

Testosterone

B

Adrenaline

Thyroxine

D

Insulin

Explanation

Q 19.    

Correct4

Incorrect-1

In DNA, the complimentary bases are

A

adenine and guanine; thymine and cytosine

B

uracil and adenine; cytosine and guanine

adenine and thymine; guanine and cytosine

D

adenine and thymine; guanine and uracil.

Explanation







Q 20.    

Correct4

Incorrect-1

Which of the following is an amine hormone?

A

Insulin

B

Progesterone

Thyroxine

D

Oxypurin

Explanation



Q 21.    

Correct4

Incorrect-1

RNA and DNA are chiral molecules, their chirality is due to

A

chiral bases

B

chiral phosphate ester units

D -sugar component

D

L-sugar component.

Explanation







Q 22.    

Correct4

Incorrect-1

Which of the following vitamins is water- soluble?

A

Vitamin {tex} \mathrm { E } {/tex}

B

Vitamin {tex} \mathrm { K } {/tex}

C

Vitamin {tex} \mathrm { A } {/tex}

Vitamin {tex} \mathrm { B } {/tex}

Explanation

Q 23.    

Correct4

Incorrect-1

The human body does not produce

A

enzymes

B

{tex} D N A {/tex}

vitamins

D

hormones.

Explanation



Q 24.    

Correct4

Incorrect-1

During the process of digestion, the proteins present in food materials are hydrolysed to
amino acids. The two enzymes involved in the process
proteins {tex} \frac { \text { enzyme } ( A ) } { } {/tex} polypeptides \[ \stackrel { \text { enzyme } ( B ) } { \longrightarrow } \text { amino acids } \] are respectively

A

invertase and zymase

B

amylase and maltase

C

diastase and lipase

pepsin and trypsin.

Explanation



Q 25.    

Correct4

Incorrect-1

Which one of the following is a peptide hormone?

A

Adrenaline

Glucagon

C

Testosterone

D

Thyroxine

Explanation