In This Post we are providing Chapter-9 Biomolecules NCERT MCQ for Class 11 Biology which will be beneficial for students. These solutions are updated according to 2021-22 syllabus. These MCQS can be really helpful in the preparation of Board exams and will provide you with a brief knowledge of the chapter.
NCERT MCQ ON BIOMOLECULES
Question 1 : In RNA, thymine is replaced by
- a) Uracil
- b) Guanine
- c) Both
- d) None of these
Answer : Uracil
Question 2: 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
Answer : amino acids and glucose
Question 3 : An enzyme brings about
- a) reduction in activation energy
- b) increase in activation energy
- c) increase in reaction time
- d) decrease in reaction time
Answer : reduction in activation energy
Question 4 : 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
Answer : feedback allosteric inhibition
Question 5 : 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
Answer : amino acid sequences within the protein molecule
Question 6: 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
Answer : 3.4 nm
Question 7 : Which of the following sets contains polysaccharides?
- a) Starch, glycogen, cellulose
- b) Sucrose, maltose, cellulose
- c) Galactose, starch, sucrose
- d) Glucose, fructose, lactose
Answer : Starch, glycogen, cellulose
Question 8 : The most basic amino acid is
- a) Arginine
- b) Glycine
- c) Histidine
- d) Glutamine
Answer : Arginine
Question 9 : The helical structure of protein is stabilized by
- a) Hydrogen bonds
- b) Disulphide bonds
- c) Peptide bonds
- d) None of these
Answer : Hydrogen bonds
Question 10: 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
Answer : ½ Vmax
Question 11 : Which group contains biocatalysts?
- a) Peptidase, amylase, rennin
- b) Glucose, amino acids, fatty acids
- c) Rhodopsin, pepsin, steapsin
- d) Myosin, oxytocin, adrenalin
Answer : Peptidase, amylase, rennin
Question 12: 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
Answer : lyases
Question 13 : 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
Answer : Fats that are generally liquid at room temperature
Question 14 : Bonds that do not exist in tertiary structure of proteins
- a) Phosphodiester bonds
- b) Hydrophobic etnractions
- c) Ionic bonds
- d) Covalent bonds
Answer : Phosphodiester bonds
Question 15 : Cleavage of specific covalent bonds and removal of groups without hydrolysis is the property of
- a) Lyases
- b) Transferases
- c) Isomerases
- d) Hydrolases
Answer : Lyases
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