MCQ On Biomolecule Class-12 » Chemistry-Papers

Identify the pair of epimers

D-glucose and D-mannose

D-glucose and L-glucose

D-glucose and D-mannose

D-glucose and D-fructose

Vitamin C must be supplied regularly in diet because

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

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

Which is a fat soluble vitamin?

Vitamin B6

Vitamin A

Vitamin C

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

ATACACTC

ATACTGCA

ATACTGAC

Biuret test is used for

Fats

Proteins

Sugar

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

(n – 2)

(n – 3)

(n – 1)

Fehling’s solution test is given by

fructose

glucose

lactose

all of these

Which of the following vitamins is water soluble?

Riboflavin

Vitamin D

Vitamin E

Osazone formation involves only 2 carbon atoms of glucose because of

reduction

chelation

hydrolysis

oxidation

Millon’s test is given by

Sucrose

ester

Proteins

Vitamin A is present in-

fish liver oil

butter

milk

all of these

Which of the following is the correct statement?

Starch is a polymer of α-glucose

Amylose is not a component of starch

Proteins are composed of only one type of amino acid

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

Guanine (B)

Cytosine (C)

Adenine (A)

Uracil (U)

D-Glucose and L-Glucose are

enantiomers

anomers

epimers

diastereomers

Guanine is an example of

a nitrogenous base

a nucleotide

a nucleoside

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

Oligosaccharide

Polysaccharide

Monosaccharide

Glucose cannot be classified as ?

Carbohydrate

Oligosaccharide

Aldose

Hexose

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

vitamin D

vitamin H

vitamin B12

Fructose reduce Tollen’s reagent due to

enolisation of fructose followed by conversion of aldehyde by base

secondary alcoholic group

primary alcoholic group

Carbohydrates have

–CHO group

–OH group

> C = O group

All

Deficiency of vitamin E causes

Scurvy

Sterility Anaemia

Muscular weakness

Molisch’s test reagent is

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

1% of β-Napthol in alcohol

both

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

black

blue

red

Which of the following bases is not present in RNA?

Cytosine

Adenine

Thymine

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

5’ and 3’

1’ and 5’

3’ and 3’

5’ and 5’

Which one of the following is reducing sugar?

Fructose

Starch

Glycogen

Cellulose

How many amino acids (approximately) are involved during the synthesis of protein?

Find out the correct option among the following statements.

All monosaccharides whether aldoses or ketoses are reducing sugar

In reducing sugars, aldehydic and ketone group are free bonded

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

Maltose and lactose are non-reducing sugar

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

peptide bond

coordinate bond

ionic bond

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

fructose and sucrose

glucose and fructose

glucose and sucrose

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

Which one of the following is non-reducing sugar?

Glucose