NEET Chemistry Chapter Wise Mock Test – Biomolecules
The change in the optical rotation of freshly prepared solution of glucose is known as
(c) specific rotation
Amylopectin is a polymer of
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
Methyl α-D-glucoside and methyl-β-D-glucoside are
(d) conformational diastereomers
Number of chiral carbon atoms in β-D-(+)-glucose is
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
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
Which of the following is an example of ketohexose?
Which one of the following does not reduce Fehling’s solution?
(b) Formic acid
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
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
Which of the following polymer is stored in the liver of animals?
Complete hydrolysis of cellulose gives
Raffinose is a
(d) None of these
Which one is a fibrous protein?
Casein contained in milk is a/an
(d) important molecule
Which of the following has an imino ( ⁄NH) group instead of an amino group (-NH2) ?
Insulin is a/an
(b) amino acid
The number of amino acids in insulin is
Which functional group participates in disulphide bond formation in proteins?
Which one of the following biomolecules is insoluble in water?
Which one of the following is a conjugated protein?
(d) All of these
There are 20 naturally occurring amino acids. The maximum number of tripeptides that can be obtained is
Which amino acid has imidazole ring?
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
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
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
The enzymes which have control site in addition to active site are called
(d) allosteric enzymes
The change in optical rotation with time of freshly prepared solution of sugar (with enzymes) is known as
(a) specific rotation
(c) rotatory motion
Which of the following contains cobalt?
Which of the following acids is a vitamin?
(a) Aspartic acid
(b) Ascorbic acid
(c) Adipic acid
(d) Saccharic acid
Night blindness may be caused by the deficiency of vitamin
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
A nucleotide consists of
(a) base and a sugar
(b) sugar and phosphate
(c) base, sugar and phosphate
(d) base and phosphate
(a) ribose sugar and thymine
(b) ribose sugar and uracil
(c) deoxyribose sugar and uracil
(d) deoxyribose sugar and thymine
Gene is a segment of
Codon is present in
Nucleic acids are polymers of
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
The pyrimidine bases present in DNA are
(a) cytosine and adenine
(b) cytosine and guanine
(c) cytosine and thymine
(d) cytosine and uracil
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
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
DNA and RNA contain four bases each. Which of the following base is not present in RNA?
Antibiotic inhibiting translation in eukaryotes is
Which one of the following is a peptide hormone?
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.
(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
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
Which set of terms correctly identifies the carbohydrate shown?
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
Assertion: DNA undergoes replication.
Reason: DNA contains cytosine and thymine as pyrimidine base.
Assertion: Maltose is a reducing sugar which give two moles of D-glucose on hydrolysis.
Reason: Maltose has a 1,4-p-glycosidic linkage.
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.
Assertion: CO and NO both combine with haemoglobin.
Reason: NO has more affinity than CO towards haemoglobin.
D-(+)-glucose reacts with hydroxylamine and yields an oxime. The structure of the oxime would be
Which of the following hormones is produced under the condition of stress which stimulates glycogenolysis in the liver of human beings?
Deficiency of vitamin B1 causes the disease
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
DNA multiplication is called
Glucose molecule reacts with X number of molecules of phenyl hydrazine to yield osazone. The value of X is
Which base is present in RNA but not in DNA?
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
Which one of the following is an example of non-reducing sugar?
The amino acid which is not optically active is
(a) lactic acid
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
Which one of the following does not exhibit the phenomenon of mutarotation?
(a) (+) sucrose
(b) (+) lactose
(c) (+) maltose
(d) (-) fructose
Hydrolysis of sucrose is called
Carbohydrates which differ in configuration at the glycosidic carbon (i.e. C1 in aldose and C2 in ketose) are called
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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