CBSE Class 11 Biology MCQs Set 03

Question. It is the most abundant carbohydrate in nature:
(a) Sucrose
(b) Maltose
(c) Starch
(d) Cellulose
Ans. D

Question. The most common monomer of carbohydrates is a molecule of :
(a) sucrose
(b) lactose
(c) maltose
(d) glucose
Ans. D

Question. Which of the following is polysaccharide:
(a) Glucose
(b) Glycogen
(c) Maltos
(d) Lactose
Ans. B

Question. On hydrolysis triglyceride yields
(a) a glycerol and three fatty acids
(b) a fatty acid and three glycerol
(c) a glucose and three fatty acids
(d) a maltose and two fatty acids
Ans. A

Question. Cholesterol is:
(a) diglyceride
(b) saturated fatty acids 
(c) unsaturated fatty acids
(d) steroid
Ans. D

Question. Silk is chemically:
(a) Lipid
(b) Wax
(c) Protein
(d) Carbohydrate
Ans. C

Question. Protoplasm of plant cell is:
(a) Less viscous than animal cell
(b) More viscous than animal cell
(c) Equal in viscosity to the animal cell
(d) None of these
Ans. A

Question. In living cell, protein is:
(a) The most abundant compound
(b) The least abundant compound
(c) The second most abundant compound
(d) The third most abundant compound
Ans. C

Question. They catalyze biological reactions in the form of enzymes:
(a) Glucose 
(b) Sucrose
(c) Proteins
(d) Terpenoids
Ans. C

Question. Amino Acids in Insulin molecules are arranged in:
(a) One polypeptide chain
(b) Two Polypeptide chains
(c) Three polypeptide chains 
(d) Four polypeptide chains
Ans. B

Question. Four polypeptide chains take part in the formation of:
(a) Cellulose
(b) Silk
(c) Hemoglobin
(d) DNA
Ans. C

Question. Each beta chain of Hemoglobin contains:
(a) 126 Amino Acids
(b) 156 Amino Acids
(c) 136 Amino Acids
(d) 146 Amino acids
Ans. D

1(c) Amino Acids are linked together by:
(a) Hydrogen Bonds
(b) Ionic Bonds 
(c) Peptide bonds 
(d) None of these
Ans. C

Question. The manner in which different peptide chains are connected determines the:
(a) Size of protein molecule
(b) Shape of protein molecule
(c) Color of protein molecule
(d) Both A & B
Ans. B

Question. Glyceraldehyde is one of the:
(a) Hexoses
(b) Trioses
(c) Pentoses
(d) Tetroses
Ans. B

Question. Sucrose is formed of:
(a) Glucose and Galactose
(b) Glucose and Maltose 
(c) Clucose and Fructose
(d) Fructose and Galactose
Ans. C

Question. They are stored in plant and animal cells:
(a) Starch and Glycogen
(b) Glucose and sucrose
(c) Starch and cellulose
(d) Fructose and glucose
Ans. A

Question. It is the most abundant carbohydrate in nature:
(a) Glucose
(b) Fructose
(c) Cellulose
(d) Starch
Ans. C

Question. Cotton fibers are made up of:
(a) Glucose
(b) Galactose
(c) Starch
(d) Cellulose
Ans. D

Question. Which of the following is true of acylglycerols
(a) composed of glycerol and fatty acids
(b) easily soluble in water
(c) act as enzymes
(d) are hydrolyzed into glucose and fructose
Ans. A

Question. Terpenoides are:
(a) Sucrose
(b) Glucose
(c) Waxes
(d) Fructose
Ans. C

Question. Nucleic acids are formed of units called:
(a) Amino acids
(b) Nucleotides
(c) Citric acids
(d) Isoprenoid units
Ans. B

Question. Typically a nucleotide is composed of:
(a) three components
(b) four components
(c) five components
(d) two components
Ans. A

Question. As compared to somatic cells the amount of DNA in germ line cells (sperms and ova) is almost:
(a) Equal
(b) Double
(c) One third
(d) Half
Ans. D

Question. The function of tRNA is:
(a) To carry genetic information’s from DNA to ribosomes
(b) To synthesize protein
(c) Pick up amino acids and transfer them to ribosomes
(d) Constitute ribosomes
Ans. C

Question. In protoplasm dry matter consists about:
(a) 90% organic and 10% inorganic compounds
(b) 70% organic and 30% inorganic compounds
(c) 60% organic and 40% inorganic compounds
(d) 50% organic and 50% inorganic compounds
Ans. A

Question. Which of the following groups is from the nucleotides:
(a) Sugar __________ Nitrogenous Base ___________ Vitamin
(b) Sugar ___________ Vitamin ______ Phosphoric acid
(c) Sugar ___________ Nitrogenous base ________ Phosphoric acid
(d) Phosphoric acid _________ Nitrogenous base _______ vitamin
Ans. C

Question. Which of the following is hydrolyzed into simple unit:
(a) ribose
(b) glucose
(c) cellulose
(d) fructose
Ans. C

Question. Glucose + Fructose _________ Sucrose + H₂O
(a) hydrolysis
(b) condensation (dehydration)
(c) denaturation
(d) incorporation synthesis
Ans. B

Question. The unique properties of each amino acid are determined by its particular
(a) R group
(b) Amino group
(c) Kinds of peptide bonds
(d) Number of bonds to other amino acids
Ans. A

Question. DNA is unique among the organic molecules of protoplasm in that it can:
(a) form multipolymer complexes
(b) come apart and re-form
(c) withstand very high temperature
(d) replicate itself
Ans. D

Question. Nucleotides of DNA molecule varies due to their:
(a) glycerol attachments
(b) nitrogenous bases
(c) sugars
(d) phosphates
Ans. B

Question. Adenine is a:
(a) single ring compound
(b) double ring compound
(c) Triple ring compound
(d) Multi-ring compound
Ans. B

Question. The function of an enzyme is to:
(a) cause chemical reactions that would not otherwise take place
(b) change the rate of chemical reactions.
(c) Control the equilibrium point of reaction
(d) Change the direction of reaction
Ans. B

Question. The enzyme sucrase act on:
(a) sucrose only
(b) sucrose and starch
(c) any disaccharide
(d) glycogen
Ans. A

Question. Which of the following forms part of coenzyme:
(a) Diastase
(b) Lipase
(c) Vitamin
(d) Lysine
Ans. C

Question. An enzyme promotes a chemical reaction by:
(a) Lowering the energy of activation
(b) Causing the release of heat
(c) Increasing molecular motion
(d) Both A & B
Ans. A

Question. Which of the following releases greatest amount of energy:
(a) Carbohydrates
(b) Lipid
(c) Water
(d) Nucleic acid
Ans. B

Question. Which of the following is an example of carbohydrate:
(a) enzymes
(b) waxes
(c) ribose
(d) insulin
Ans. C

Question. DNA molecule:
(a) has a sugar-phosphate backbone
(b) is single stranded
(c) has a certain sequence of amino acids
(d) has a uracil base in its nucleotide
Ans. A

Question. The functional group COOH is:
(a) Acidic
(b) Basic
(c) Never ionized
(d) All of these
Ans. A

Question. Which of these is nondigestible by man:
(a) cellulose
(b) maltose
(c) starch
(d) glycogen
Ans. A

Question. A fatty acid is unsaturated if it:
(a) contains hydrogen
(b) contains double bonds between carbon atoms
(c) contains an acidic group
(d) contains no double bonds
Ans. B

Question. Glucose in solution forms a ring called:
(a) glucofuranose
(b) ribofuranose
(c) glucopyranose
(d) ribopyranose
Ans. C

Question. Which of the following is not soluble in water:
(a) Sucrose
(b) Ribose
(c) Glycerol
(d) Glycogen
Ans. D

Question. Which of the following is absent in the nucleotides of RNA:
(a) Thymine
(b) Cytosine
(c) Adenine
(d) Uracil
Ans. A

Question. The linkages between two monosaccharides is called:
(a) Ester
(b) Glucoside
(c) Peptide
(d) Nucleotide
Ans. B

Question. Distance between twist of DNA molecule is:
(a) 14 A
(b) 24 A
(c) 34 A
(d) 44 A
Ans. C

Question. Which of the following is a complete monomeric unit of DNA:
(a) pentose sugar
(b) phosphoric acid
(c) nucleotide
(d) adenine
Ans. C

Question. The formula of glyceraldehydes is:
(a) C₃ H₅ O₃
(b) C₃ H₆ O₃
(c) C₃ H₄ O₃
(d) C₃ H₆ O₄
Ans. B

Question. The number of Carbon in oleic acid is:
(a) 16
(b) 18
(c) 20
(d) 22
Ans. B

Question. Vitamin A is a:
(a) protein
(b) wax
(c) terpenoid
(d) carbohydrate
Ans. C

Question. Which of the following is not true of palmatic acid:
(a) saturated
(b) unsaturated
(c) unbranched
(d) 16 carbons
Ans. B

Question. Which of these makes cellulose nondigestable:
(a) a polymer of glucose subunits
(b) a fibrous protein
(c) the linkage between the glucose molecules
(d) the peptide linkage
Ans. C

Question. Which of these is not a lipid:
(a) steroid
(b) wax
(c) polysaccharide
(d) terpenoids
Ans. C

Question. Which of the following is variable in an amino acid?
(a) Amino group
(b) Carboxyl group
(c) R-group
(d) Hydrogen
Ans. C

Question. Which of the following is resistant to degradation ?
(a) wax
(b) sucrose
(c) starch
(d) triglyceride
Ans. A

Question. Beta Carotene is:
(a) phospholipids
(b) terpenoid
(c) polysaccharide
(d) wax
Ans. B

Question. Which of the following is a richer source of chemical energy?
(a) glucose
(b) glycogen
(c) lipids
(d) proteins
Ans. C

Question. Cholesterol is:
(a) Diglyceride
(b) Saturated fat
(c) Unsaturated fat
(d) Steroid
Ans. D

Question. The structure of a protein can be denatured by:
(a) the polar bond of water molecule
(b) heat
(c) the presence of oxygen gas
(d) the presence
Ans. B