NEET Chemistry Chapter Wise Mock Test – Biomolecules

NEET Chemistry Chapter Wise Mock Test – Biomolecules

Question 1.
The change in the optical rotation of freshly prepared solution of glucose is known as
(a) tautomerism
(b) racemisation
(c) specific rotation
(d) mutarotation

Question 2.
Amylopectin is a polymer of
(a) α-D-glucose
(b) α-D-fructose
(c) lactose
(d) amylose

Question 3.
The term anomers of glucose refers to
(a) isomers of glucose that differ in configuration at carbons one and four (C-1 and C-4)
(b) a mixture of D-glucose and L-glucose
(c) enantiomers of glucose
(d) isomers of glucose that differ in configuration at carbon one C-1

Question 4.
Methyl α-D-glucoside and methyl-β-D-glucoside are
(a) epimers
(b) anomers
(c) enantiomers
(d) conformational diastereomers

Question 5.
Number of chiral carbon atoms in β-D-(+)-glucose is
(a) five
(b) six
(c) three
(d) four

Question 6.
Glycogen is a branched chain polymer of α-D-glucose units in which chain is formed by CrC4 glycosidic linkage whereas, branching occurs by the formation of CrC6 glycosidic linkage. Structure of glycogen is Similar to
(a) amylose
(b) amylopectin
(c) cellulose
(d) glycogen

Question 7.
The correct statement about the following disaccharide is

(a) Ring (I) is pyranose with α-glycosidic link
(b) Ring (I) is furanose with α-glycosidic link
(c) Ring (II) is furanose with α-glycosidic link
(d) Ring (II) is pyranose with α-glycosidic link

Question 8.
Which of the following is an example of ketohexose?
(a) Mannose
(b) Galactose
(c) Maltose
(d) Fructose

Question 9.
Which one of the following does not reduce Fehling’s solution?
(a) Benzaldehyde
(b) Formic acid
(c) Glucose
(d) Fructose

Question 10.
Sucrose (cane sugar) is a disaccharide. One molecule of sucrose on hydrolysis gives
(a) 2 molecules of glucose
(b) 2 molecules of glucose + 1 molecule of fructose
(c) 1 molecule of glucose + 1 molecule of fructose
(d) 2 molecules of fructose

Question 11.
A compound give negative test with ninhydrin and positive test with Benedict’s solution. The compound is
(a) a protein
(b) an amino acid
(c) a lipid
(d) a monosaccharide

Question 12.
Which of the following polymer is stored in the liver of animals?
(a) Amylose
(b) Cellulose
(c) Amylopectin
(d) Glycogen

Question 13.
Complete hydrolysis of cellulose gives
(a) D-fructose
(b) D-ribose
(c) D-g1ucose
(d) L-glucose

Question 14.
Raffinose is a
(a) disaccharide
(b) monosaccharide
(c) trisaccharide
(d) None of these

Question 15.
Which one is a fibrous protein?
(a) Globulin
(b) Collagen
(c) Hordein
(d) Glutin

Question 16.
Casein contained in milk is a/an
(a) carbohydrate
(b) lipid
(c) protein
(d) important molecule

Question 17.
Which of the following has an imino ( ⁄NH) group instead of an amino group (-NH2) ?
(a) Proline
(b) Isoleucine
(c) Tyrosine
(d) Serine

Question 18.
Insulin is a/an
(a) protein
(b) amino acid
(c) carbohydrate
(d) lipid

Question 19.
The number of amino acids in insulin is
(a) 21
(b) 574
(c) 51
(d) 5733

Question 20.
Which functional group participates in disulphide bond formation in proteins?
(a) Thiolactone
(b) Thiol
(c) Thioether
(d) Thioester

Question 21.
Which one of the following biomolecules is insoluble in water?
(a) α-keratin
(b) Haemoglobin
(c) Ribonuclease
(d) Adenine

Question 22.
Which one of the following is a conjugated protein?
(a) Phosphoprotein
(b) Glycoprotein
(c) Chromoprotein
(d) All of these

Question 23.
There are 20 naturally occurring amino acids. The maximum number of tripeptides that can be obtained is
(a) 8000
(b) 6470
(c) 7465
(d) 5360

Question 24.
Which amino acid has imidazole ring?
(a) Alanine
(b) Leucine
(c) Tyrosine
(d) Histidine

Question 25.
Which of the following set consists only of essential amino acids?
(a) Alanine, tyrosine, cystine
(b) Leucine, lysine, tryptophan
(c) Alanine, glutamine, lycine
(d) Leucine, proline, glycine

Question 26.
Isoelectric point is
(a) specific temperature
(b) suitable concentration of amino acid
(c) hydrogen ion concentration that does not allow migration of amino acid under electric field
(d) melting point of an amino acid under the influence of electric field

Question 27.
Proteins when heated with cone. HNO₃ give a yellow colour. This is
(a) Hoppe’s test
(b) acid-base test
(c) Biuret test
(d) xanthoproteic test

Question 28.
The enzymes which have control site in addition to active site are called
(a) holozymes
(b) coenzymes
(c) apoenzymes
(d) allosteric enzymes

Question 29.
The change in optical rotation with time of freshly prepared solution of sugar (with enzymes) is known as
(a) specific rotation
(b) inversion
(c) rotatory motion
(d) mutarotation

Question 30.
Which of the following contains cobalt?
(a) Vitamin-A
(b) Vitamin-C
(c) Vitamin-B₁₂
(d) Vitamin-K

Question 31.
Which of the following acids is a vitamin?
(a) Aspartic acid
(b) Ascorbic acid
(c) Adipic acid
(d) Saccharic acid

Question 32.
Night blindness may be caused by the deficiency of vitamin
(a) A
(b) B
(c) C
(d) D

Question 33.
Which of the following B group vitamins can be stored in our body?
(a) Vitamin B₁
(b) Vitamin B₂
(c) Vitamin B₆
(d) Vitamin B₁₂

Question 34.
A nucleotide consists of
(a) base and a sugar
(b) sugar and phosphate
(c) base, sugar and phosphate
(d) base and phosphate

Question 35.
RNA contains
(a) ribose sugar and thymine
(b) ribose sugar and uracil
(c) deoxyribose sugar and uracil
(d) deoxyribose sugar and thymine

Question 36.
Gene is a segment of
(a) DNA
(b) protein
(c) mRNA
(d) tRNA

Question 37.
Codon is present in
(a) tRNA
(b) mRNA
(c) fats
(d) rRNA

Question 38.
Nucleic acids are polymers of
(a) nucleosides
(b) globulins
(c) nucleons
(d) nucleotides

Question 39.
The reason for double helical structure of DNA is operation of
(a) van der Waals’ forces
(b) dipole-dipole interaction
(c) hydrogen bonding
(d) electrostatic attractions

Question 40.
The pyrimidine bases present in DNA are
(a) cytosine and adenine
(b) cytosine and guanine
(c) cytosine and thymine
(d) cytosine and uracil

Question 41.
RNA and DNA are chiral molecules, their chirality is due to
(a) L-sugar component
(b) chiral bases
(c) D-sugar component
(d) chiral phosphate ester units

Question 42.
In both DNA and RNA, heterocyclic base and phosphate ester linkages are at
(a) C’₅ and C’₁ respectively of the sugar molecule
(b) C’₁ and C’₅ respectively of the sugar molecule
(c) C’₂ and C’₅ respectively of the sugar molecule
(d) C’₅ and C’₂ respectively of the sugar molecule

Question 43.
DNA and RNA contain four bases each. Which of the following base is not present in RNA?
(a) Adenine
(b) Uracil
(c) Thymine
(d) Cytosine

Question 44.
Antibiotic inhibiting translation in eukaryotes is
(a) tetracycline
(b) penicillin
(c) puromycin
(d) Chloromycetin

Question 45.
Which one of the following is a peptide hormone?
(a) Glucagon
(b) Testosterone
(c) Thyroxine
(d) Adrenaline

Question 46.
Insulin production of its action in human body are responsible for the level of diabetes. This compound belongs to which of the following categories?
(a) A coenzyme
(b) A hormone
(c) An enzyme
(d) An antibiotic

Direction (Q.Nos.47-48): In the following questions more than one of the answers given may be correct. Select the correct answers and mark it accordingly to the codes.
Codes
(a) 1,2 and 3 are correct
(b) 1 and 2 are correct
(c) 2 and 4 are correct
(d) 1 and 3 are correct

Question 47.
Which of the following statements are true?
1. Maltose forms an osazone
2. Lactose undergoes mutarotation
3. Galactose is a C₄-epimer of glucose
4. in starch, the glucose units are linked by β-linkages

Question 48.
Which set of terms correctly identifies the carbohydrate shown?

1. Pentose
2. Aldose
3. Furanose
4. Pyranose

Question 49.

Question 50.

Direction (Q.Nos.51-54): Each of these questions contain two statements: Assertion and Reason. Each of these questions also has four alternative choices, only one of which is the correct answer. You have to select one of the codes (a),(b), (c) and (d) given below.
(a) Assertion is true, Reason is true; Reason is a correct explanation for Assertion
(b) Assertion is true, Reason is true; Reason is not a correct explanation for Assertion
(c) Assertion is true, Reason is false
(d) Assertion is false, Reason is true

Question 51.
Assertion: DNA undergoes replication.
Reason: DNA contains cytosine and thymine as pyrimidine base.

Question 52.
Assertion: Maltose is a reducing sugar which give two moles of D-glucose on hydrolysis.
Reason: Maltose has a 1,4-p-glycosidic linkage.

Question 53.
Assertion: The term anomers of glucose refers to isomers of glucose that differ in configuration at carbon one (C-1).
Reason: Anomers of glucose are cyclic diastereomers differ in configuration at C-1 existing in two forms a and b respectively.

Question 54.
Assertion: CO and NO both combine with haemoglobin.
Reason: NO has more affinity than CO towards haemoglobin.

Question 55.
D-(+)-glucose reacts with hydroxylamine and yields an oxime. The structure of the oxime would be

Question 56.
Which of the following hormones is produced under the condition of stress which stimulates glycogenolysis in the liver of human beings?
(a) Thyroxine
(b) Insulin
(c) Adrenaline
(d) Estradiol

Question 57.
Deficiency of vitamin B₁ causes the disease
(a) convulsions
(b) beri-beri
(c) cheilosis
(d) sterility

Question 58.
Which one of the following sets of monosaccharides forms sucrose?
(a) α-D-galactopyranose and α-D-glucopyranose
(b) α-D-glucopyranose and β-D-fructofuranose
(c) β -D-glucopyranose and α-D-fructofuranose
(d) α-D-galactopyranose and β-D-fructofuranose

Question 59.
DNA multiplication is called
(a) translation
(b) transduction
(c) transcription
(d) replication

Question 60.
Glucose molecule reacts with X number of molecules of phenyl hydrazine to yield osazone. The value of X is
(a) four
(b) one
(c) two
(d) three

Question 61.
Which base is present in RNA but not in DNA?
(a) Uracil
(b) Cytosine
(c) Guanine
(d) Thymine

Question 62.
Which one of the following statements is not true regarding (+) lactose?
(a) (+) lactose is a b-glycoside formed by the union of a molecule of D-(+)-glucose and a molecule of D-(+)-galactose
(b) (+) lactose is a reducing sugar and does not exhibit mutarotation
(c) (+) lactose, C₁₂H₂₂O₁₁ contains 8 —OH groups
(d) On hydrolysis, (+) lactose gives equal amount of D-(+)-glucose and D-(+)-galactose

Question 63.
Which one of the following is an example of non-reducing sugar?
(a) Sucrose
(b) Lactose
(c) Maltose
(d) Cellobiose

Question 64.
The amino acid which is not optically active is
(a) lactic acid
(b) serine
(c) alanine
(d) glycine

Question 65.
A codon has a sequence of A and specifies a
particular B that is to be incorporated into a C. What are A, B, C?
A B C
(a) 3 bases Amino acid Carbohydrate
(b) 3 acids Carbohydrate Protein
(c) 3 bases Protein Amino acid
(d) 3 bases Amino acid Protein

Question 66.
Which one of the following does not exhibit the phenomenon of mutarotation?
(a) (+) sucrose
(b) (+) lactose
(c) (+) maltose
(d) (-) fructose

Question 67.
Hydrolysis of sucrose is called
(a) inversion
(b) esterification
(c) hydration
(d) saponification

Question 68.
Carbohydrates which differ in configuration at the glycosidic carbon (i.e. C₁ in aldose and C₂ in ketose) are called
(a) anomers
(b) epimers
(c) diastereomers
(d) enantiomers

Question 69.
Secondary structure of proteins refers to
(a) mainly denatured proteins and structure of prosthetic group
(b) three dimensional structure, especially the bond between amino acid residue that are distant from each other in the polypeptide chain
(c) linear sequence of amino acid residues in the polypeptide chain
(d) regular folding patterns of continuous portions of the polypeptide chain

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