Biomolecules Practice Questions - DPP for JEE

 Page 1


1. Three cyclic structures of monosaccharides are given below which of
these are anomers
(a) I and II
(b) II and III
(c) I and III
(d) III is anomer of I and II
2. Which of the following statements about vitamin B
12
 is incorrect
?
Page 2


1. Three cyclic structures of monosaccharides are given below which of
these are anomers
(a) I and II
(b) II and III
(c) I and III
(d) III is anomer of I and II
2. Which of the following statements about vitamin B
12
 is incorrect
?
(a) It has a cobalt atom.
(b) It also occurs in plants.
(c) It is also present in rain water.
(d) It is needed for human body in very small amounts.
3. Proteins when heated with conc. HNO
3
 give a yellow colour. This
is
(a) Oxidizing test
(b) Xanthoproteic test
(c) Hoppe’s test
(d) Acid base test
4. The pair of compounds in which both the compounds  give positive test
with Tollen’s reagent is
(a) Glucose and Sucrose
(b) Fructose and Sucrose
(c) Acetophenone and Hexanal
(d) Glucose and Fructose
5. Hydrolysis of sucrose is called
(a) hydration
(b) saponification
(c) esterification
(d) inversion
6. Which is not a true statement?
Page 3


1. Three cyclic structures of monosaccharides are given below which of
these are anomers
(a) I and II
(b) II and III
(c) I and III
(d) III is anomer of I and II
2. Which of the following statements about vitamin B
12
 is incorrect
?
(a) It has a cobalt atom.
(b) It also occurs in plants.
(c) It is also present in rain water.
(d) It is needed for human body in very small amounts.
3. Proteins when heated with conc. HNO
3
 give a yellow colour. This
is
(a) Oxidizing test
(b) Xanthoproteic test
(c) Hoppe’s test
(d) Acid base test
4. The pair of compounds in which both the compounds  give positive test
with Tollen’s reagent is
(a) Glucose and Sucrose
(b) Fructose and Sucrose
(c) Acetophenone and Hexanal
(d) Glucose and Fructose
5. Hydrolysis of sucrose is called
(a) hydration
(b) saponification
(c) esterification
(d) inversion
6. Which is not a true statement?
(a) a- Carbon of a-amino acid is asymmetric.  
(b) All proteins are found in L-form.
(c) Human body can synthesize all proteins they need.
(d) At pH=7 both amino acids and carboxylic groups exist in the ionised
form.
7. The best solvent for removing butter stain from cloth is
(a) CHCl
3
(b) C
2
H
5
OH
(c) C
2
H
5
OC
2
H
5
(d) H
2
O
8. The number of amino acids found in proteins that a human body can
synthesize is
(a) 20
(b) 10
(c) 5
(d) 14
9. Chemically amylose is a _________ with 200–1000 a-D-(+)-glucose
units held by ______ glycosidic linkage
(a) long unbranched chain, C1– C6.
(b) branched chain, C1 – C4.
(c) long unbranched chain, C1– C4.
(d) branched chain, C1– C6
10. If one strand of DNA has the sequence ATGCTTGA, the sequence in
Page 4


1. Three cyclic structures of monosaccharides are given below which of
these are anomers
(a) I and II
(b) II and III
(c) I and III
(d) III is anomer of I and II
2. Which of the following statements about vitamin B
12
 is incorrect
?
(a) It has a cobalt atom.
(b) It also occurs in plants.
(c) It is also present in rain water.
(d) It is needed for human body in very small amounts.
3. Proteins when heated with conc. HNO
3
 give a yellow colour. This
is
(a) Oxidizing test
(b) Xanthoproteic test
(c) Hoppe’s test
(d) Acid base test
4. The pair of compounds in which both the compounds  give positive test
with Tollen’s reagent is
(a) Glucose and Sucrose
(b) Fructose and Sucrose
(c) Acetophenone and Hexanal
(d) Glucose and Fructose
5. Hydrolysis of sucrose is called
(a) hydration
(b) saponification
(c) esterification
(d) inversion
6. Which is not a true statement?
(a) a- Carbon of a-amino acid is asymmetric.  
(b) All proteins are found in L-form.
(c) Human body can synthesize all proteins they need.
(d) At pH=7 both amino acids and carboxylic groups exist in the ionised
form.
7. The best solvent for removing butter stain from cloth is
(a) CHCl
3
(b) C
2
H
5
OH
(c) C
2
H
5
OC
2
H
5
(d) H
2
O
8. The number of amino acids found in proteins that a human body can
synthesize is
(a) 20
(b) 10
(c) 5
(d) 14
9. Chemically amylose is a _________ with 200–1000 a-D-(+)-glucose
units held by ______ glycosidic linkage
(a) long unbranched chain, C1– C6.
(b) branched chain, C1 – C4.
(c) long unbranched chain, C1– C4.
(d) branched chain, C1– C6
10. If one strand of DNA has the sequence ATGCTTGA, the sequence in
the complimentary strand would be
(a) TACGAACT
(b) TCCGAACT
(c) TACGTACT
(d) TACGTAGT
11. Which statement is incorrect about peptide bond?
(a) C–N bond length in proteins is longer than usual C–N bond length.
(b) Spectroscopic analysis shows planar structure of  bond.
(c) C–N bond length in proteins is smaller than usual C–N bond length.
(d) None of these.
12. An acidic amino acid among the following is
(a) glycine
(b) valine
(c) proline
(d) leucine
13. In an amino acid, the carboxyl group ionises at = 2.34 and
ammonium ion at = 9.60. The isoelectric point of the amino acid
is at pH
(a) 5.97
(b) 2.34
(c) 9.60
(d) 6.97
14. For osazone formation, the effective structural unit necessary is
(a)
3
(b)
Page 5


1. Three cyclic structures of monosaccharides are given below which of
these are anomers
(a) I and II
(b) II and III
(c) I and III
(d) III is anomer of I and II
2. Which of the following statements about vitamin B
12
 is incorrect
?
(a) It has a cobalt atom.
(b) It also occurs in plants.
(c) It is also present in rain water.
(d) It is needed for human body in very small amounts.
3. Proteins when heated with conc. HNO
3
 give a yellow colour. This
is
(a) Oxidizing test
(b) Xanthoproteic test
(c) Hoppe’s test
(d) Acid base test
4. The pair of compounds in which both the compounds  give positive test
with Tollen’s reagent is
(a) Glucose and Sucrose
(b) Fructose and Sucrose
(c) Acetophenone and Hexanal
(d) Glucose and Fructose
5. Hydrolysis of sucrose is called
(a) hydration
(b) saponification
(c) esterification
(d) inversion
6. Which is not a true statement?
(a) a- Carbon of a-amino acid is asymmetric.  
(b) All proteins are found in L-form.
(c) Human body can synthesize all proteins they need.
(d) At pH=7 both amino acids and carboxylic groups exist in the ionised
form.
7. The best solvent for removing butter stain from cloth is
(a) CHCl
3
(b) C
2
H
5
OH
(c) C
2
H
5
OC
2
H
5
(d) H
2
O
8. The number of amino acids found in proteins that a human body can
synthesize is
(a) 20
(b) 10
(c) 5
(d) 14
9. Chemically amylose is a _________ with 200–1000 a-D-(+)-glucose
units held by ______ glycosidic linkage
(a) long unbranched chain, C1– C6.
(b) branched chain, C1 – C4.
(c) long unbranched chain, C1– C4.
(d) branched chain, C1– C6
10. If one strand of DNA has the sequence ATGCTTGA, the sequence in
the complimentary strand would be
(a) TACGAACT
(b) TCCGAACT
(c) TACGTACT
(d) TACGTAGT
11. Which statement is incorrect about peptide bond?
(a) C–N bond length in proteins is longer than usual C–N bond length.
(b) Spectroscopic analysis shows planar structure of  bond.
(c) C–N bond length in proteins is smaller than usual C–N bond length.
(d) None of these.
12. An acidic amino acid among the following is
(a) glycine
(b) valine
(c) proline
(d) leucine
13. In an amino acid, the carboxyl group ionises at = 2.34 and
ammonium ion at = 9.60. The isoelectric point of the amino acid
is at pH
(a) 5.97
(b) 2.34
(c) 9.60
(d) 6.97
14. For osazone formation, the effective structural unit necessary is
(a)
3
(b)
(c)
(d)
15. The following carbohydrate is
(a) a ketohexose
(b) an aldohexose
(c) an a-furanose
(d) an a-pyranose
16. A reagent suitable for the determination of N-terminal residue of a
peptide is
(a) p-Toluenesulphonyl chloride
(b) 2, 4-Dinitrophenylhydrazine
(c) Carboxypeptidase
(d) 2, 4-Dinitrofluorobenzene
17. Amino acids generally exist in the form of Zwitter ions. This means
they contain
(a) basic—NH
2 
group and acidic —COOH group
(b) the basic— group and acidic —COO
–
 group
(c) basic—NH
2
 and acidic —H
+
 group
(d) basic–COO
– 
group and acidic — group
18. The two functional groups present in a typical carbohydrate are:
(a) – CHO and – COOH