CBSE Class 12 Chemistry Biomolecules Worksheet Set A

Question. Sucrose on hydrolysis gives
(a) β-D-glucose + α-D-fructose
(b) α-D-glucose + β-D-glucose
(c) α-D-glucose + β-D-fructose
(d) α-D-fructose + β-D-fructose. 
Answer. C

Question. The difference between amylose and amylopectin is
(a) amylopectin have 1 → 4 a-linkage and 1 → 6 a-linkage
(b) amylose have 1 → 4 a-linkage and 1 → 6 b-linkage
(c) amylopectin have 1 → 4 a-linkage and 1 → 6 b-linkage
(d) amylose is made up of glucose and galactose.
Answer. C

Question. Which one given below is a non-reducing sugar?
(a) Glucose
(b) Sucrose
(c) Maltose
(d) Lactose 
Answer. B

Question. Which one of the following sets of monosaccharides forms sucrose?
(a) a-D-galactopyranose and a-D-glucopyranose
(b) a-D-glucopyranose and b-D-fructofuranose
(c) b-D-glucopyranose and a-D-fructofuranose
(d) a-D-glucopyranose and b-D-fructopyranose
Answer. B

Question. Which one of the following statements is not true regarding (+)–lactose?
(a) On hydrolysis (+)–lactose gives equal amount of D(+)–glucose and D(+)–galactose.
(b) (+)–Lactose is a b-glucoside formed by the union of a molecule of D(+)–glucose and a molecule of D(+)–galactose.
(c) (+)–Lactose is a reducing sugar and does not exhibit mutarotation.
(d) (+)–Lactose, C₁₂H₂₂O₁₁ contains 8 –OH groups.
Answer. C

Question. Which one of the following does not exhibit the phenomenon of mutarotation?
(a) (+)–Sucrose
(b) (+)–Lactose
(c) (+)–Maltose
(d) (–)–Fructose 
Answer. A

Question. Fructose reduces Tollens’ reagent due to
(a) asymmetric carbons
(b) primary alcoholic group
(c) secondary alcoholic group
(d) enolisation of fructose followed by conversion to aldehyde by base. 
Answer. D

Question. Number of chiral carbons in b-D-(+) glucose is
(a) five
(b) six
(c) three
(d) four. 
Answer. D

Question. Glycolysis is
(a) oxidation of glucose to glutamate
(b) conversion of pyruvate to citrate
(c) oxidation of glucose to pyruvate
(d) conversion of glucose to haem. 
Answer. C

Question. Cellulose is polymer of
(a) glucose
(b) fructose
(c) ribose
(d) sucrose. 
Answer. A

Question. Which of the following gives positive Fehling solution test?
(a) Sucrose
(b) Glucose
(c) Fats
(d) Protein 
Answer. B

Question. a-D-glucose and b-D-glucose are
(a) epimers
(b) anomers
(c) enantiomers
(d) diastereomers. 
Answer. B

Question. Which of the following is the sweetest sugar?
(a) Fructose
(b) Glucose
(c) Sucrose
(d) Maltose 
Answer. A

Question. Glucose molecule reacts with X number of molecules of phenyl hydrazine to yield osazone. The value of X is
(a) two
(b) one
(c) four
(d) three.
Answer. D

Question. The oxidation of glucose is one of the most important reactions in a living cell. What is the number of ATP molecules generated in cells from one molecule of glucose?
(a) 28
(b) 38
(c) 12
(d) 18 
Answer. B

Question. The a-D-glucose and b-D-glucose differ from each other due to difference in carbon atom with respect to its
(a) number of OH groups
(b) size of hemiacetal ring
(c) conformation
(d) configuration.
Answer. D

Question. Chemically considering digestion is basically
(a) anabolism
(b) hydrogenation
(c) hydrolysis
(d) dehydrogenation. 
Answer. C

Question. On hydrolysis of starch, we finally get
(a) glucose
(b) fructose
(c) both (a) and (b)
(d) sucrose.
Answer. A

Question. Which of the following is a basic amino acid?
(a) Serine
(b) Alanine
(c) Tyrosine
(d) Lysine 
Answer. D

Question. The non-essential amino acid among the following is
(a) lysine
(b) valine
(c) leucine
(d) alanine.
Answer. D

Question. Which structure(s) of proteins remain(s) intact during denaturation process?
(a) Both secondary and tertiary structures
(b) Primary structure only
(c) Secondary structure only
(d) Tertiary structure only 
Answer. B

Question. Which of the following compounds can form a zwitter ion?
(a) Aniline
(b) Acetanilide
(c) Benzoic acid
(d) Glycine
Answer. D

Question. In a protein molecule various amino acids are linked together by
(a) peptide bond
(b) dative bond
(c) a-glycosidic bond
(d) b-glycosidic bond. 
Answer. A

Question. Which of the statements about “Denaturation” given below are correct?
(1) Denaturation of proteins causes loss of secondary and tertiary structures of the protein.
(2) Denaturation leads to the conversion of double strand of DNA into single strand.
(3) Denaturation affects primary structure which gets distorted.
(a) (2) and (3)
(b) (1) and (3)
(c) (1) and (2)
(d) (1), (2) and (3)
Answer. C

Question. Which functional group participates in disulphide bond formation in proteins?
(a) Thioester
(b) Thioether
(c) Thiol
(d) Thiolactone
Answer. C

Question. The correct statement in respect of protein haemoglobin is that it
(a) functions as a catalyst for biological reactions
(b) maintains blood sugar level
(c) acts as an oxygen carrier in the blood
(d) forms antibodies and offers resistance to diseases. 
Answer. C

Question. The helical structure of protein is stabilised by
(a) dipeptide bonds
(b) hydrogen bonds
(c) ether bonds
(d) peptide bonds.
Answer. B

CBSE Class 12 Chemistry Biomolecules Worksheet Set A 

             Very Short Answer

Q1)       What are the essential constituents of our food?

Q2)       What are sugars?

Q3)       Define biochemistry?

Q4)       What is the other name for carbohydrates?

Q5)       What is lactose?

              Short Answer

Q6)       How the glucose is prepared?

Q7)       What do you mean by glyceraldehyde?

Q8)       What are the facts and reactions of the cyclic structure of glucose that cannot be explained?

Q9)       What do you understand by the term glucose?

Q10)     How are D and L glyceraldehyde related?

              Long Answer

Q11)     State the difference between glucose and sucrose?

Q12)     Write short note on fructose?

Q13)     Explain the classification of the carbohydrates?

Q14)     State the difference between maltose and sucrose?

Q15)     Explain the structure of the glucose?

Please click on below link to download CBSE Class 12 Chemistry Biomolecules Worksheet Set A