CBSE Class 11 Biology Biomolecules MCQs Set 04

Question: Which one of the following statements is correct, with reference to enzymes?
a) Holoenzyme = Apoenzyme + Coenzyme
b) Coenzyme = Apoenzyme + Holoenzyme
c) Holoenzyme = Coenzyme + Co-factor
d) Apoenzyme = Holoenzyme + Coenzyme
Answer: b

Question: The acid used for preliminary separation of biomolecule in a living tissue is
a) trichlorobenzoic acid
b) benzoic acid
c) trichloroacetic acid
d) acetic acid
Answer: d

Question: Which of the following type of enzyme is not matched correctly with the molecule that it breaks down?
a) Amylase–starch
b) Lipase–starch
c) Protease–proteins
d) Disaccharidase–sugars
Answer: b

Question: The nicotinamide is synthesized in our body from
a) tryptophan
b) tryosine
c) valine
d) alanine
Answer: a

Question: Turn over number of enzyme depends upon
a) size of enzyme molecule.
b) number of the active sites.
c) concentration of substrate molecule.
d) molecular weight of as enzyme.
Answer: d

Question: Which of the following gives Fehling’s test?
a) Pectin
b) Sucrose
c) Cellulose
d) Glucose
Answer: d

Question: Nucleotides are building blocks of nucleic acids. Each nucleotide is a composite molecule formed by
a) base-sugar-phosphate.
b) base-sugar-OH.
c) (base-sugar-phosphate)n.
d) sugar-phosphate.
Answer: a

Question: The Km value of the enzyme is the value of the substrate concentration at which the reaction reaches to
a) Zero
b) 2 Vmax
c) ½ Vmax
d) ¼ Vmax
Answer: c

Question: Which of the following statement is not true about amino acid?
a) The amino group and carboxylic group of an amino acid are attached to both amino and carboxylic groups to alpha carbon.
b) Amino acids have an N-terminus, C-terminus, and R groups.
c) Amino acid can be classified by the number of peptide bond.
d) Essential amino acids are not synthesized in the body, therefore have to be provided in the diet.
Answer: b

Question: Gamma globulins are synthesized inside
a) liver
b) kidney
c) bone marrow
d) lymph and lymphoid tissues
Answer: a

Question: The simplest amino acid is
a) glycine
b) proline
c) leucine
d) tryptophan
Answer: c

Question: Which one of the following statements regarding starch and cellulose is not correct?
a) Both of them are of plant origin.
b) Both of them are polymers.
c) Both of them give colour with iodine.
d) Both of them are made up of glucose molecules.
Answer: c

Question: Who coined the term zymase?
a) Pasteur
b) Buchner
c) Kuhne
d) Sumner
Answer: b

Question: Alpha-keratin is a protein present in
a) blood
b) skin
c) lymph
d) eggs
Answer: b

Question: Inorganic catalyst work efficiently at _______ temperature and ________ pressure.
a) high, low
b) low, low
c) low, high
d) high, high
Answer: d

Question: Primary structure of protein is due to the presence of
a) hydrogen bonds
b) peptide bonds
c) –S–S– linkages
d) ionic bonds
Answer: a

Question: An example of competitive inhibition of an enzyme is the inhibition of
a) succinic dehydrogenase by malonic acid
b) cytochrome oxidase by cyanide
c) hexokinase by glucose-6-phosphate
d) carbonic anhydrase by carbon dioxide
Answer: a

Question: Which of the following set of three items are not true as each set belongs to the category mentioned against them
a) Lysine, glycine, thiamine – Amino acids
b) Myosin, oxytocin and gastrin – Hormones
c) Rennin, helicase and hyaluronidase – Enzyme
d) Optic nerve, occulomotor, vagus – Sensory nerves
Answer: c

Question: Select the incorrect statement.
a) Amino acids are substituents methanes.
b) Glycerol is a trihydroxy propane.
c) Lysine is a neutral amino acid.
d) Lecithin is a phospholipid.
Answer: a

Question: Which of the following statement is wrong regarding chitin?
a) It is a storage of polysaccharide.
b) It is a heteropolysaccharide.
c) It is a constituent of arthropods and fungal cell wall.
d) It is a second most abundant carbohydrate on earth.
Answer: d

Question: The most basic amino acid is
a) arginine
b) histidine
c) glycine
d) glutamine
Answer: d

Question: Lecithin is a
a) phospholipid
b) carbohydrate
c) protein
d) amino acid
Answer: d

Question: Biomolecules are
a) organic compounds
b) inorganic compounds
c) volatile compounds
d) both (a) and (b)
Answer: b

Question: Quaternary structure is present in
a) haemoglobin
b) histone
c) globulin
d) elastin
Answer: b

Question: Phospholipids are important cell membrane constituents because they
a) contain glycerol
b) can form bilayers in water
c) combine covalently with protein
d) contain polar and non-polar portions
Answer: c

Question: The charged molecule which is electrically neutral is known as
a) amino acid
b) zwitterion
c) amide
d) peptide
Answer: d

Question: Which statement is true?
a) Adenine has 4 nitrogen atoms.
b) Cytosine has 3 nitrogen atoms.
c) Guanosine has 3 nitrogen atoms.
d) Uracil has 5 nitrogen atoms.
Answer: a

Question: All the following amino acids are aromatic, except
a) tyrosine
b) phenylalanine
c) tryptophan
d) valine
Answer: d

Question: Apoenzyme is
a) protein
b) lipid
c) sugar
d) vitamin
Answer: a

Question: Glycerol is a
a) tetrahydroxy propane
b) trihydroxy propane
c) trihydroxy butane
d) tetrahydroxy butane
Answer: c

Question: A nucleotide is formed of
a) purine, pyrimidine and phosphate
b) purine, sugar and phosphate
c) nitrogen base, sugar and phosphate
d) pyrimidine, sugar and phosphate
Answer: b

Question: Which of the following is the example of acidic amino acid?
a) Lysine
b) Glutamic acid
c) Aspartic acid
d) Both (b) and (c)
Answer: c

Question: Inulin is a polymer of
a) glucose
b) galactose
c) fructose
d) arabinose
Answer: d

Question: Building block of nucleic acid is
a) nucleotide
b) nucleoside
c) amino acid
d) fatty acid
Answer: d

Question: Most abundant protein in human body is
a) collagen
b) myosin
c) actin
d) albumin
Answer: d

Question: The bond between phosphate and hydroxyl group of sugar in nucleic acid is
a) glycosidic bond
b) peptide bond
c) ester bond
d) none of these
Answer: d

Question: Unsaturated fatty acids have
a) palmitic acid
b) oleic acid
c) high melting point
d) one or more double bonds
Answer: d

Question: Which of the following statement is incorrect?
a) Long chain molecules of fatty acids are formed by polymerization of 2 carbon compounds.
b) Lipid molecules are soluble in water.
c) In lipid, R group may be –CH₃ group, –C₂H₅ group or higher number of –CH₂ group (1 to 19 carbon).
d) Oils have lower melting temperature.
Answer: b

Question: A fat has
a) 3 glycerol and one fatty acid molecule
b) one glycerol and 3 fatty acid molecules
c) 3 glycerol and 3 fatty acid molecules
d) one glycerol and one fatty acid molecule
Answer: b

Question: Which of the following statement is incorrect regarding secondary metabolites?
a) Plant tissues produce only secondary metabolities.
b) Secondary metabolities have restricted distribution in the plant kingdoms.
c) Abrin and ricin are secondary metabolities used as a drugs.
d) Some secondary metabolites have ecological importance.
Answer: d

Question: Feedback inhibition of enzymes is affected by
a) enzyme
b) substrate
c) end product
d) intermediate end products
Answer: b

Question: Which of the following contain β-1,4 linkage?
a) Maltose
b) Sucrose
c) Lactose
d) Fructose
Answer: c

Question: Pick out the correct statement.
a) Chitin is a homopolymer.
b) Collagen is the most abundant protein in the whole of the biosphere.
c) Proteins are linear chains of amino acids linked by peptide bonds.
d) In a polysaccharide, the individual monosaccharides are linked by a phosphodiester bond.
Answer: d

Question: Proteins are
a) polysaccharides
b) polyamides
c) polynucleotides
d) polyglycol
Answer: b

Question: The Km value of the enzyme is the value of the substrate concentration at which the reaction reaches to
a) zero
b) 2 Vmax
c) ½ Vmax
d) ¼ Vmax
Answer: d

Question: Which of the following is/are essential fatty acid(s)?
a) Linoleic acid
b) Linolenic acid
c) Arachidonic acid
d) All of these
Answer: c

Question: Co-enzyme is
a) always a protein
b) often a metal
c) always an inorganic compound
d) often a vitamin
Answer: d

Question: Which one of the following is a non-reducing carbohydrate?
a) Maltose
b) Sucrose
c) Lactose
d) Ribose 5-phosphate
Answer: b

Question: High energy bond of ATP are present in between
a) C – C
b) C – O
c) C – N
d) O – P
Answer: d

Question: Ribozyme is a/an
a) enzyme whose cofactor is RNA
b) RNA with enzyme activity
c) enzyme by which RNA is formed
d) conjugated protein having ribose sugar
Answer: d

Question: Select the incorrect statement.
a) Ribozymes are nucleic acids with catalytic power.
b) Proteins are homopolymer made of amino acids.
c) Inulin is a polymer of fructose.
d) Glycogen is stored in liver and muscles.
Answer: b

Question: Which is the derivative of amino acid?
a) Epinephrine
b) Estrogen
c) Progesterone
d) All of these
Answer: a

Question: Inorganic catalyst work efficiently at ________ temperature and ________ pressure.
a) high, low
b) low, low
c) low, high
d) high, high
Answer: a

Question. Select the correctly matched.
(a) Anthocyanins – Alkaloids
(b) Carotenoids – Toxins
(c) Ricin – Drugs
(d) Lemon grass oil – Essential oils.

Answer: D

Question. Pigments are considered as the secondary metabolites, having some particular functions. Which of the following is an example of pigments?
(a) Carotenoids
(b) Codeine
(c) Concanavalin-A
(d) Curcumin

Answer: A

Question. Physical and chemical properties of amino acids depend on
(a) Amino group
(b) Carboxylic group
(c) R-group
(d) All of the options

Answer: D

Question. Which of the following is acidic amino acid.
(a) Glutamic acid
(b) Aspartic acid
(c) Ascorbic acid
(d) Both (a) and (b)

Answer: D

Question. Which of the following is the molecular formula of Palmitic acid ?
(a) CH₃(CH₂)₂COOH
(b) CH₃(CH₂)₁₄COOH
(c) CH₃(CH₂)₁₆COOH
(d) CH₃(CH₂)₁₈COOH 

Answer: B

Question. Which of the following elements present most abundantly on earth crust?
(a) Carbon
(b) Hydrogen
(c) Oxygen
(d) Silicon

Answer: C

Question. Inulin is a polymer of
(a) Glucose
(b) Amino acids
(c) Fructose
(d) Nucleotides

Answer: C

Question. Which of the following compounds is used in the chemical analysis of living tissue?
(a) CH₃COOH
(b) Cl₃CCOOH
(c) HCHO
(d) C₆H₁₂O₆  

Answer: B

Question. Which of the following can be included along with biomolecules?
(1) Carbohydrate
(2) Protein
(3 Lipids
(4) Nucleic acid
(5) Vitamins
(6) Minerals
(7) Water
(a) 1, 2, 3, 4, 5, 6, 7
(b) 1, 2, 3, 4, 5, 6
(c) 1, 2, 3, 4, 5
(d) 1, 2, 3, 4

Answer: C

Question. Which of the following is not the example of aromatic amino acid?
(a) Tyrosin
(b) Tryptophan
(c) Threonin
(d) Phenylalanine

Answer: C

Question. Which of the following can not be considered as the example of polymeric substances?
(a) Rubber
(b) Gums
(c) Cellulose
(d) Vinblastin

Answer: D

Question. In proteins, amino acids are attached together by :
(a) Peptide bond
(b) Amide bond
(c) Ester bond
(d) a & b both

Answer: D

Question. Which of the following is micromolecule ?
(a) Lipid
(b) DNA
(c) Protein
(d) All of the options

Answer: A

Question. When a dry piece of tissue is fully burnt, all the carbon compounds are oxidised to gaseous form and the remaining is called ‘ash’. The ash contains all of the following, except.
(a) Calcium
(b) Magnesium
(c) Sulphure
(d) Nucleic acid

Answer: D