NCERT Class 11 Chapter 9 Biology Biomolecules MCQ

NCERT Class 11 Chapter 9 Biology Biomolecules MCQ | Questions & Answers: Now is the perfect time for you guys to take up the NCERT Class 11 Chapter 9 Biology Biomolecules Quiz. From the below section you guys can find a lot of Multiple Choice Questions which will help you guys know new concepts about the Class 11 Chapter 9 Biology Biomolecules topic.

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1. A nucleotide is formed of

A. Nitrogen base, sugar and phosphate

B. Pyrimidine, sugar and phosphate

C. Purine, sugar and phosphate

D. Purine, pyrimidine and phosphate

2. Glycogen is a polymer of

A. glucose

B. sucrose

C. galactose

D. fructose

3. Most abundant organic compound on earth is

A. Cellulose

B. Steroids

C. Protein

D. Lipids

4. Protein synthesis in a cell takes place

A. in the cytoplasm as well as in mitochondria

B. in the nucleolus as well as in the cytoplasm

C. only on ribosomes attached to the nuclear envelope

D. only in the cytoplasm

5. In RNA, thymine is replaced by

A. Uracil

B. Guanine

C. Both

D. None of these

6. Carrier ions like Na+ facilitate the absorption of substances like:

A. amino acids and glucose

B. glucose and fatty acids

C. fatty acids and glycerol

D. fructose and some amino acids

7. An enzyme brings about

A. reduction in activation energy

B. an increase in activation energy

C. increase in reaction time

D. decrease in reaction time

8. The enzymes hexokinase which catalyses glucose to glucose-6-phosphate in glycolysis is inhibited by glucose- 6-phosphate. This is an example of

A. feedback allosteric inhibition

B. non-competitive inhibition

C. competitive inhibition

D. None of these

9. The enormous diversity of protein molecules is due mainly to the diversity of

A. amino acid sequences within the protein molecule

B. peptide bonds

C. R groups on the amino acids

D. amino groups on the amino acids

10. Length of one turn of the helix in a B-form DNA is approximately

A. 3.4 nm

B. 0.34 nm

C. Both

D. None of these

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11. Which of the following sets contains polysaccharides?

A. Starch, glycogen, cellulose

B. Sucrose, maltose, cellulose

C. Galactose, starch, sucrose

D. Glucose, fructose, lactose

12. The most basic amino acid is

A. Arginine

B. Glycine

C. Histidine

D. Glutamine

13. The helical structure of protein is stabilized by

A. Hydrogen bonds

B. Disulphide bonds

C. Peptide bonds

D. None of these

14. The Km value of the enzyme is the value of the substrate concentration at which the reaction reaches to

A. ½ Vmax

B. Zero

C. ¼ Vmax

D. 2 Vmax

15. Which group contains biocatalysts?

A. Peptidase, amylase, rennin

B. Glucose, amino acids, fatty acids

C. Rhodopsin, pepsin, steapsin

D. Myosin, oxytocin, adrenalin

16. Enzymes that catalyse removal of groups from substrates by mechanisms other than hydrolysis, and addition of groups to double bonds, are called

A. lyases

B. dehydrogenases

C. Both

D. None of these

17. Oils are rich in

A. Fats that are generally liquid at room temperature

B. Glycerol that possesses three hydroxyl groups

C. Esters of fatty acids

D. Saturated fatty acids

18. Bonds that do not exist in tertiary structure of proteins

A. Phosphodiester bonds

B. Hydrophobic etnractions

C. Ionic bonds

D. Covalent bonds

19. Cleavage of specific covalent bonds and removal of groups without hydrolysis is the property of

A. Lyases

B. Transferases

C. Isomerases

D. Hydrolases

20. Essential amino acids include

A. all of these

B. valine

C. leucine

D. tryptophan

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21. Which of the following is not a part of enzyme but it activates the enzyme?

A. K

B. C

C. N

D. Si

22. Which is not consistent with double helical structure of DNA?

A. A=T == C = G

B. Density of DNA decreases on heating

C. A + T/C + G is not constant

D. Both a) and b)

23. DNA is composed of repeating units of

A. ribonucleosides

B. deoxyribonucleosides

C. ribonucleotides

D. deoxyribonucleotides

24. A segment of DNA has 120 adenine and 120 cytosine bases. The total number of nucleotides present in the segment is

A. 120

B. 240

C. 60

D. 480