MCQ On Biomolecule Class-12 » Chemistry-Papers

What will be the sequence of complimentary strand of DNA if the one strand of DNA has the sequence of TATGACTG?

ATACTGCA

ATACTGAC

ATACACTC

Proteins are the polymers of -amino acids and they are connected to each other by ------

ionic bond

peptide bond

coordinate bond

Which carbohydrate is used in silvering of mirror?

(B) Fructose

(D) B and C

(A) Sucrose

Phosphodiester linkage is present between which carbon atoms of pentose sugars of nucleotides?

5’ and 3’

3’ and 3’

1’ and 5’

5’ and 5’

Deficiency of biotin causes dermatitis and paralysis, biotin is also known as

vitamin B12

vitamin D

vitamin H

Biuret test is used for

Proteins

Sugar

Fats

Which of the following statements is not correct?

In alpha-amino acids, - NH2 and – COOH groups are attached to different carbon atoms.

Natural proteins are commonly made up of L-isomer of amino acids (D) In -amino acids, - NH2 and

Except glycine, all other amino acids show optical activity

Deficiency of vitamin E causes

Muscular weakness

Scurvy

Sterility Anaemia

Reduction of hexose A (molecular formula C6H12O6) with sodium borohydride gives compound B and C. Compound B is optically inactive, whereas compound C is optically active . Which of the following is compound A?

D-galactose

D-mannose

D-glucose

D-fructose

Fructose reduce Tollen’s reagent due to

enolisation of fructose followed by conversion of aldehyde by base

primary alcoholic group

secondary alcoholic group

Carbohydrate that cannot be hydrolysed further to give simpler unit of polyhydroxy aldehyde or ketone.

Monosaccharide

Oligosaccharide

Polysaccharide

Vitamin A is present in-

milk

fish liver oil

all of these

butter

Which of the following bases is not present in RNA?

Adenine

Cytosine

Thymine

D-Glucose and L-Glucose are

diastereomers

enantiomers

epimers

anomers

Identify the pair of epimers

D-glucose and L-glucose

D-glucose and D-mannose

D-glucose and D-fructose

D-glucose and D-mannose

Millon’s test is given by

ester

Proteins

Sucrose

Carbohydrates have

> C = O group

–CHO group

–OH group

All

Select the base which is not common in DNA and RNA.

Uracil (U)

Guanine (B)

Cytosine (C)

Adenine (A)

How many number of water molecules are removed from the n number of amino acids during the formation of peptide bond?

(n – 3)

(n – 2)

(n – 1)

Glucose cannot be classified as ?

Aldose

Oligosaccharide

Carbohydrate

Hexose

Find out the correct option among the following statements.

Fehling’s solution and Tollen’s reagent are non-reducing sugar

Maltose and lactose are non-reducing sugar

All monosaccharides whether aldoses or ketoses are reducing sugar

In reducing sugars, aldehydic and ketone group are free bonded

Which of the following vitamins is water soluble?

Riboflavin

Vitamin E

Vitamin D

Guanine is an example of

a nucleoside

a nitrogenous base

a nucleotide

The two monosaccharide units obtained on hydrolysis of disaccharide may be

same

different

both

Which of the following is the correct statement?

Starch is a polymer of α-glucose

Proteins are composed of only one type of amino acid

Amylose is not a component of starch

Molisch’s test reagent is

1% of β-Napthol in alcohol

5% solution of α-Napthol in alcohol and few droplets of conc. H2SO4

both

Vitamin C must be supplied regularly in diet because

it is water soluble hence excreted in urine and can’t be stored in the body

it is fat soluble hence stored in the body and cannot be used on regular basis

it is water soluble hence used by the body on daily basis and is to be supplied regularly

Fehling’s solution test is given by

fructose

lactose

all of these

glucose

In iodine test of starch which colour of ppt had been observed

red

black

blue

Osazone formation involves only 2 carbon atoms of glucose because of

chelation

oxidation

reduction

hydrolysis

Which one of the following is non-reducing sugar?

Glucose

Sucrose

Fructose

Maltose

Which one of the following is reducing sugar?

Cellulose

Glycogen