CBSE Class 11 Biology Biomolecules MCQs Set 03

Question: The two functional groups characteristic of sugars are
a) hydroxyl and methyl
b) carbonyl and methyl
c) carbonyl and phosphate
d) carbonyl and hydroxyl.
Answer: d

Question: Which of the following glucose transporters is insulin-dependent?
a) GLUT IV
b) GLUT I
c) GLUT II
d) GLUT III
Answer: a

Question: About 98 percent of the mass of every living organism is composed of just six elements including carbon, hydrogen, nitrogen, oxygen and
a) sulphur and magnesium
b) magnesium and sodium
c) calcium and phosphorus
d) phosphorus and sulphur.
Answer: d

Question: Concanavalin A is
a) a pigment
b) an alkaloid
c) an essential oil
d) a lectin.
Answer: d

Question: Which of the following is the simplest amino acid?
a) Alanine
b) Asparagine
c) Glycine
d) Tyrosine
Answer: d

Question: Living cell contains 60 – 95% water. Water present in human body is
a) 60 – 65%
b) 50 – 55%
c) 75 – 80%
d) 65 – 70%.
Answer: d

Question: Uridine, present only in RNA is a
a) nucleoside
b) nucleotide
c) purine
d) pyrimidine.
Answer: a

Question: Which one of the following biomolecules is correctly characterized?
a) Lecithin-a phosphorylated glyceride found in cell membrane.
b) Palmitic acid – an unsaturated fatty acid with 18 carbon atoms.
c) Adenylic acid – adenosine with a glucose phosphate molecule.
d) Alanine amino acid – contains an amino group and an acidic group anywhere in the molecule
Answer: a

Question: “Ramachandran plot” is used to confirm the structure of
a) RNA
b) proteins
c) triacylglycerides
d) DNA.
Answer: b

Question: Which is a typical example of ‘feedback inhibition’?
a) Cyanide and cytochrome reaction
b) Sulpha drugs and folic acid synthesizer bacteria
c) Allosteric inhibition of hexokinase by glucose 6-phosphate
d) Reaction between succinic dehydrogenase and succinic acid
Answer: c

Question: Enzymes having slightly different molecular structure but performing identical activity are
a) holoenzymes
b) isoenzymes
c) apoenzymes
d) coenzymes.
Answer: b

Question: The major role of minor elements inside living organisms is to act as
a) co-factors of enzymes
b) building blocks of important amino acids
c) constituent of hormones
d) binder of cell structure.
Answer: c

Question: The basic unit of nucleic acid is
a) pentose sugar
b) nucleoid
c) nucleoside
d) nucleotide.
Answer: d

Question: Role of an enzyme in reactions is to/as
a) decrease activation energy
b) increase activation energy
c) inorganic catalyst
d) none of the above.
Answer: a

Question: Essential amino acid is
a) phenylalanine
b) glycine
c) aspartic acid
d) serine.
Answer: a

Question: Amino acids are mostly synthesised from
a) mineral salts
b) fatty acids
c) volatile acids
d) α-ketoglutaric acid.
Answer: d

Question: What are the most diverse molecules in the cell?
a) Lipids
b) Mineral salts
c) Proteins
d) Carbohydrates
Answer: c

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

Question: Which one of the following statements is wrong?
a) Uracil is a pyrimidine.
b) Glycine is a sulphur containing amino acid.
c) Sucrose is a disaccharide.
d) Cellulose is a polysaccharide.
Answer: b

Question: A phosphoglyceride is always made up of
a) a saturated or unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached
b) a saturated or unsaturated fatty acid esterified to a phosphate group which is also attached to a glycerol molecule
c) only a saturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached
d) only an unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached.
Answer: a

Question: Secondary metabolites such as nicotine, strychnine and caffeine are produced by plants for their
a) nutritive value
b) growth response
c) defence action
d) effect on reproduction.
Answer: c

Question: Identify the basic amino acid from the following.
a) Tyrosine
b) Glutamic Acid
c) Lysine
d) Valine
Answer: c

Question: Lipids are insoluble in water because lipid molecules are
a) hydrophilic
b) hydrophobic
c) neutral
d) zwitter ions.
Answer: b

Question: Which one is the most abundant protein in the animal world?
a) Trypsin
b) Haemoglobin
c) Collagen
d) Insulin
Answer: c

Question: Which purine base is found in RNA?
a) Thymine
b) Uracil
c) Cytosine
d) Guanine
Answer: d

Question: Which one of the following is the most abundant protein in the animals?
a) Haemoglobin
b) Collagen
c) Lectin
d) Insulin
Answer: b

Question: Spoilage of oil can be detected by which fatty acid?
a) Oleic acid
b) Linolenic acid
c) Linoleic acid
d) Erucic acid.
Answer: d

Question: The four elements that make up 99% of all elements found in a living system are
a) C, H, O and P
b) C, N, O and P
c) H, O, C and N
d) C, H, O and S.
Answer: c

Question: The chitinous exoskeleton of arthropods is formed by the polymerisation of
a) N – acetyl glucosamine
b) lipoglycans
c) keratin sulphate and chondroitin sulphate
d) D – glucosamine.
Answer: a

Question: An organic substance bound to an enzyme and essential for its activity is called
a) isoenzyme
b) coenzyme
c) holoenzyme
d) apoenzyme.
Answer: b

Question: RNA does not possess
a) uracil
b) thymine
c) adenine
d) cytosine
Answer: b

Question: The catalytic efficiency of two different enzymes can be compared by the
a) formation of the product
b) pH of optimum value
c) Km value
d) molecular size of the enzyme.
Answer: c

Question: Macromolecule chitin is
a) sulphur containing polysaccharide
b) simple polysaccharide
c) nitrogen containing polysaccharide
d) phosphorus containing polysaccharide.
Answer: c

Question: A typical fat molecule is made up of
a) one glycerol and one fatty acid molecule
b) three glycerol and three fatty acid molecules
c) three glycerol molecules and one fatty acid molecule
d) one glycerol and three fatty acid molecules.
Answer: d

Question: Carbohydrates are commonly found as starch in plants storage organs. Which of the following five properties of starch (1-5) make it useful as a storage material?
(1) Easily translocated
(2) Chemically non-reactive
(3) Easily digested by animals
(4) Osmotically inactive
(5) Synthesized during photosynthesis
The useful properties are
a) (1), (3) and (5)
b) (1) and (5)
c) (2) and (3)
d) (2) and (4).
Answer: d