MCQ Questions for Class 12 Chemistry Chapter 14 Biomolecules with Answers

We have compiled the NCERT MCQ Questions for Class 12 Chemistry Chapter 14 Biomolecules with Answers Pdf free download covering the entire syllabus. Practice MCQ Questions for Class 12 Chemistry with Answers on a daily basis and score well in exams. Refer to the Biomolecules Class 12 MCQs Questions with Answers here along with a detailed explanation.

Biomolecules Class 12 MCQs Questions with Answers

Question 1.
The number of tripeptide formed by 3 different amino acids.
(a) Three
(b) Four
(c) Five
(d) Six.

Answer

Answer: (d) Six.


Biomolecules with Answers

Question 2.
The functional group which is found in amino acids is
(a) COOH
(b) -NH2
(c) -CH3
(d) both (a) and (b).

Answer

Answer: (d) both (a) and (b).


Biomolecules Questions with Answers

Question 3.
The vitamins absorbed from intestine along with fats are
(a) A and D
(b) A, B
(c) A, C
(d) D, B

Answer

Answer: (a) A and D


Question 4.
Which amino acids is a chiral?
(a) Alanine
(b) Valine
(c) Proline
(d) Histidine
(e) none of these.

Answer

Answer: (e) none of these.


Question 5.
Which of the following biomolecules is insoluble in water?
(a) a-Keratin
(b) haemoglobin
(c) ribonuclease
(d) adenime

Answer

Answer: (a) a-Keratin


Question 6.
The protein responsible for blood clotting is
(a) Albumins
(b) Globulins
(c) Fibroin
(d) Fibrinogen

Answer

Answer: (d) Fibrinogen


Question 7.
Which one of them is not a protein?
(a) Wool
(b) Nail
(c) Hair
(d) DNA

Answer

Answer: (d) DNA


Question 8.
The helical structure of protein is stabilized by:
(a) Peptide band
(b) Dipeptide band
(c) Hydrogen bands
(d) vander Waal’s forces

Answer

Answer: (c) Hydrogen bands


Question 9.
Which of the following has a branched chain structure
(a) Amylopectin
(b) Anylose
(c) Cellulose
(d) Nylon

Answer

Answer: (a) Amylopectin


Question 10.
Glucose reacts with acetic anhydride to form
(a) Monoacetate
(b) Tetraacetate
(c) Penta-acetate
(d) Hexa-acetate

Answer

Answer: (c) Penta-acetate


Question 11.
Which of the following has not a glucosidic linkage?
(a) Sucrose
(b) Amylose
(c) Galactose
(d) Maltose.

Answer

Answer: (c) Galactose


Question 12.
Amino acids are the building blocks of
(a) Carbohydrates
(b) Vitamins
(c) Fats
(d) Proteins.

Answer

Answer: (d) Proteins.


Question 13.
Which carbohydrates is an essential constituent of plant cells?
(a) Starch
(b) Cellulose
(c) Sucrose
(d) Vitamins

Answer

Answer: (b) Cellulose


Question 14.
Enzymes in the living system
(a) provide energy
(b) provide immunity
(c) transport oxygen
(d) catalyse biological reaction

Answer

Answer: (d) catalyse biological reaction


Question 15.
Which of the following in the sweetest sugar:
(a) Sucrose
(b) Glucose
(c) Fructose
(d) Maltose

Answer

Answer: (c) Fructose


Question 16.
Which of the following statements is true for protein synthesis
(a) amino acids are directly recognised by m-RNA.
(b) the third base of codon is less specific.
(c) only one codon codes for an amino acid.
(d) every t-RNA has more than one amino acid attachment.

Answer

Answer: (b) the third base of codon is less specific.


Question 17.
Which of the following contains a transition metal?
(a) Chlorophyll
(b) Haemoglobin
(c) Vitamin B12
(d) DNA

Answer

Answer: (b) Haemoglobin, (c) Vitamin B12


Question 18.
The number of chiral carbons in ß-D (+) glucose is:
(a) five
(b) six
(c) three
(d) four

Answer

Answer: (a) five


Question 19.
Which one is correct?
(a) Starch is a polymer of a-glucose
(b) Amylose is a component of cellulose.
(c) Proteins are composed of only one type of amino acids
(d) In cyclic structure of furanose, these are 4 carbons and one oxygen atom.

Answer

Answer: (a) Starch is a polymer of a-glucose


Question 20.
Enzymes belong to which class of compounds.
(a) Polysaccharides
(b) Polypeptides
(c) Polynitroheterocyclic components
(d) Hydrocarbon.

Answer

Answer: (b) Polypeptides


Question 21.
The nucleic acid base having two possible binding sites is
(a) Thymine
(b) Cytosine
(c) Guanine
(d) Adenine.

Answer

Answer: (c) Guanine


Question 22.
In both DNA and RNA, heterocyclic base and phosphate ester linkages are at
(a) C5‘ and C2‘ of the sugar molecule respectively.
(b) C2‘ and C5‘ respectively of the sugar molecule.
(c) C1‘ and C5‘ respectively of the sugar molecule.
(d) C5‘ and C1‘ respectively of sugar molecule.

Answer

Answer: (c) C1‘ and C5‘ respectively of the sugar molecule.


Question 23.
The correct statement for protein haemoglobin.
(a) functions as a catalyst for biological reactions.
(b) maintains blood sugar level.
(c) acts as oxygen carrier in blood.
(d) forms antibodies and offers resistance to disease.

Answer

Answer: (c) acts as oxygen carrier in blood.


Question 24.
The helical structure of protein is stabilised by
(a) dipeptide bonds
(b) hydrogen bonds
(c) ether bonds
(d) peptide bonds

Answer

Answer: (b) hydrogen bonds


Question 25.
Among the following a chiral amino acid is:
(a) Ethylalanine
(b) Methylglyane
(c) 2-Hydroxymethylresfne
(d) Triptophane.

Answer

Answer: (c) 2-Hydroxymethylresfne


Question 26.
Which base is present in RNA, but not in DNA.
(a) Uracil
(b) Cytosine
(c) Guanine
(d) Thymine.

Answer

Answer: (a) Uracil


Question 27.
Complete hydrolysis of cellulose gives:
(a) L-glucose
(b) D-fructose
(c) D-ribose
(d) D-glucose.

Answer

Answer: (d) D-glucose.


Question 28.
The enzyme which hydrolysis triglycerides to fatty acids and glycerol is called:
(a) Maltose
(b) Lipase
(c) Zymase
(d) Pepsin

Answer

Answer: (b) Lipase


Question 29.
The cell memberanes are mainly composed of:
(a) Phospholipids
(b) Proteins
(c) Fats
(d) Carbohydrates

Answer

Answer: (a) Phospholipids


Question 30.
Which functional group participates in disulphide bond formation in proteins?
(a) Thio ether
(b) Thiol
(c) Thio ester
(d) Thiol actone.

Answer

Answer: (b) Thiol


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