MCQ On Biomolecule Class-12 » Chemistry-Papers

Which carbohydrate is used in silvering of mirror?

(D) B and C

(A) Sucrose

(B) Fructose

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

Which of the following bases is not present in RNA?

Adenine

Thymine

Cytosine

Deficiency of vitamin E causes

Muscular weakness

Sterility Anaemia

Scurvy

D-Glucose and L-Glucose are

diastereomers

epimers

anomers

enantiomers

Carbohydrates have

–CHO group

> C = O group

All

–OH group

Which one of the following is reducing sugar?

Fructose

Cellulose

Starch

Glycogen

Find out the correct option among the following statements.

In reducing sugars, aldehydic and ketone group are free bonded

Maltose and lactose are non-reducing sugar

All monosaccharides whether aldoses or ketoses are reducing sugar

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

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

1’ and 5’

5’ and 3’

3’ and 3’

5’ and 5’

Molisch’s test reagent is

1% of β-Napthol in alcohol

both

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

Which of the following statements is not correct?

Except glycine, all other amino acids show optical activity

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

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

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

blue

black

red

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

Oligosaccharide

Monosaccharide

Polysaccharide

Identify the pair of epimers

D-glucose and D-mannose

D-glucose and L-glucose

D-glucose and D-fructose

D-glucose and D-mannose

Guanine is an example of

a nitrogenous base

a nucleotide

a nucleoside

The pair of compounds in which both the compounds give positive test with Tollen’s reagent is

glucose and fructose

fructose and sucrose

glucose and sucrose

Glucose cannot be classified as ?

Aldose

Oligosaccharide

Carbohydrate

Hexose

Vitamin A is present in-

fish liver oil

butter

milk

all of these

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

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

peptide bond

coordinate bond

ionic bond

Biuret test is used for

Proteins

Sugar

Fats

Osazone formation involves only 2 carbon atoms of glucose because of

hydrolysis

oxidation

chelation

reduction

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

(n – 2)

(n – 1)

(n – 3)

The two monosaccharide units obtained on hydrolysis of disaccharide may be

same

both

different

Fructose reduce Tollen’s reagent due to

enolisation of fructose followed by conversion of aldehyde by base

secondary alcoholic group

primary alcoholic group

Which is a fat soluble vitamin?

Vitamin A

Vitamin C

Vitamin B6

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

vitamin H

vitamin D

vitamin B12

Millon’s test is given by

Sucrose

ester

Proteins

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

ATACTGAC

ATACACTC

ATACTGCA

Which of the following is the correct statement?

Amylose is not a component of starch

Proteins are composed of only one type of amino acid

Starch is a polymer of α-glucose

Which of the following vitamins is water soluble?

Vitamin E

Vitamin D

Riboflavin

Which one of the following is non-reducing sugar?