Q.1.
A nucleoside is formed through a N-glycosidic linkage by joining ... [ HPPMT 2010 ]
-
40%
a) Phosphate group with nitrogen base
-
10%
b) Nitrogen base with nitrogen base
-
40%
c) Nitrogen base with pentose sugar
-
10%
d) Pentose sugar with phosphate group
Q.2.
DNA replication occurs in 5'→ 3' direction because ... ... [ Manipur 2005 ]
-
69%
a) DNA polymerase III can polymerise nucleotides in 5' → 3' direction
-
6%
b) DNA polymerase I carries out editing
-
19%
c) DNA polymerase II can link up only in 5' → 3' direction
-
6%
d) DNA polymerase II carries out editing
Q.3.
DNA replication is eukaryotes commences .... ....
-
50%
a) From both ends of chromosome simultaneously
-
14%
b) Several sites along DNA of a chromosome simulatneously
-
7%
c) From centromere to either end
-
29%
d) From one end of chromosome to the other
Q.4.
1.7 m double helical DNA will have base pairs ..... ... [ AMU 2011 ]
-
43%
a) 3.4 ×109
-
29%
b) 5×109
-
29%
c) 1.7×109
-
0%
d) 1.7×105
Q.5.
Who was awarded Nobel prize for in vitro synthesis of polyribonucleotide? [ RPMT 2002 ]
-
50%
a) Kornberg
-
5%
b) Tatum
-
15%
c) Ochoa
-
30%
d) Khorana
Q.6.
Transcription .... ... [ DPMT 2005 ]
-
29%
a) Starts at initiator region and ends at stop region
-
7%
b) Starts at operator region and ends at telomeric end
-
50%
c) Starts at promoter region and ends at terminator region
-
14%
d) Starts at CAA box and ends at TATA box
Explanation
Q.7.
The process by which DNA forms mRNA and mRNA forms protein are respectively ... ... [ MPPMT 1998 ]
-
24%
a) Translation and transcription
-
29%
b) Transcription and replication
-
29%
c) Transcription and translation
-
18%
d) Replication and translation
Q.8.
Number of hydrogen bonds between A and T of DNA is .... .... [ WB 207 ]
-
13%
a) 4
-
20%
b) 3
-
67%
c) 2
-
0%
d) 1
Q.9.
Read (i) to (v) and find the correct option (i)Nitrogen base is linked to pentose sugar through N-glycosidic linkage (ii) Phosphate group is linked to 5' - OH of a nucleoside through phosphoester linkage (iii) Two nucleosides are linked through 3' - 5' N-glycosidic linkage (iv) Negatively changed DNA is wrapped around positively charged histone octamer to form nucleosome (v)Chromatin that is more densely packed and stains dark is called euchromatin ... .. [ kerala 2012 ]
-
17%
a) i, ii, iii wrong
-
8%
b) iv alone is wrong
-
67%
c) iii and v are wrong
-
8%
d) i alone is wrong
Q.10.
The phenomenon of 5' end third base of tRNA pairing with on-complementary base of mRNA is ... .... [ KCET 2008 ]
-
31%
a) Collinearity
-
46%
b) Degeneracy
-
8%
c) Wobbling
-
15%
d) University
Q.11.
Who proved experimental proof of semi-conservative DNA replication ... [ DPMT 2007 ]
-
0%
a) Cairns
-
50%
b) Meselson and Stahl
-
7%
c) Taylor
-
43%
d) Watson and Crick
Q.12.
During DNA replication, the strands separate by .... ... [ CBSE 1993 ]
-
43%
a) DNA polymerase
-
14%
b) Topoisomerase
-
43%
c) Unwindase/ helicase
-
0%
d) Gyrase
Q.13.
Which of the following heavy/ radioisotopes is not suitable for DNA labeling based studies ... ... [ JKCMEE 2011 ]
-
38%
a) H3
-
15%
b) P32
-
15%
c) N15
-
31%
d) S35
Q.14.
The most abundant RNA of cell is ... .. [ Odisha 2002 ]
-
50%
a) mRNA
-
7%
b) tRNA
-
36%
c) rRNA
-
7%
d) Catalytic RNA
Q.15.
Strand of DNA that functions as template for mRNA transcription is ... .. [ EAMCET 2008 ] (a) Coding strand (b) Non-coding strand (c) Sense strand (d) Antisense strand the correct answer is ..
-
14%
a) a and c
-
14%
b) a and d
-
50%
c) b and c
-
21%
d) b and d
Q.16.
RNA contains .... .. [ AIIMS 1996 ]
-
0%
a) Hexose
-
92%
b) Ribose
-
0%
c) Fructose
-
8%
d) Glucose
Q.17.
Haploid content of human DNA is ... .. [ AIIMS 2008 ]
-
15%
a) 1.65 ×109 bP
-
8%
b) 3.1 - 3.3 ×109 bP
-
8%
c) 4.6 ×109 bP
-
69%
d) 3.3 ×109 bP
Q.18.
During DNA replication, torques are relieved by enzymes ... ...
-
15%
a) DNA ligase
-
31%
b) DNA polymerase
-
23%
c) DNA helicase
-
31%
d) DNA gyrase
Q.19.
Double helix model of Watson and Crick is ... ... [ CPMT 2004 ]
-
23%
a) CDNA
-
15%
b) ZDNA
-
23%
c) DDNA
-
38%
d) BDNA
Q.20.
Site of tRNA that binds to mRNA molecule is ... ... [ MPPMT 1993]
-
15%
a) 3' end
-
15%
b) 5' end
-
23%
c) Codon
-
46%
d) Anticodon
Q.21.
What does lac refer to in lac operon... ....[ CBSE 2003 ]
-
21%
a) Lactase
-
7%
b) 1,00,000
-
14%
c) Lac insect
-
57%
d) lactose
Q.22.
What is catalyzed by reverse transcriptase, information transfer from ... ...
-
6%
a) RNA to RNA
-
3%
b) DNA to RNA
-
48%
c) Protein to DNA
-
42%
d) RNA to DNA
Q.23.
Length of DNA with 23 base pairs is ... ... [ WB. 2009 ]
-
9%
a) 78.4 Å
-
36%
b) 78.2 Å
-
36%
c) 78 Å
-
18%
d) 74.8 Å
Q.24.
Anticodon present on tRNA complementary to initiator codon AUG of mRNA is .... [ KCET 2005 ]
-
0%
a) CAG
-
18%
b) GUA
-
24%
c) TAC
-
59%
d) UAC
Q.25.
Small part of DNA that can undergo recombination is .... ... [DPMT 2002 ]
-
20%
a) Muton
-
40%
b) Cistron
-
40%
c) Replicon
-
0%
d) Recon
Q.26.
Which one of the following is not applicable to RNA? [ ReAIPMT 2015]
-
62%
a) Chargaff's rule
-
8%
b) Complementary base pairing
-
31%
c) 5' phosphoryl and 3' hydroxyl ends
-
0%
d) Heterocyclic nitrogenous bases
Q.27.
Blood stain component to be used for DNA profiling technique is ... ... [ KCET 2009 ]
-
27%
a) Serum
-
27%
b) Leucocytes
-
36%
c) Platelets
-
9%
d) Erythrocytes
Q.28.
GCG stands for which amino acid ... ... [ CET Chd.2010 ]
-
50%
a) Alanine
-
40%
b) Glutamine
-
10%
c) Proline
-
0%
d) Serine
Q.29.
DNA synthesis can be measured by estimating incorporation of radio-labeled ... ... [ CBSE 1997]
-
36%
a) Uracil
-
27%
b) Ribose sugar
-
36%
c) Thymidine
-
0%
d) Adenine
Q.30.
Alkaptonuria is caused by a .... ... [ JIPMER 2002 ]
-
20%
a) X -linked recessive gene
-
20%
b) X-linked dominant gene
-
60%
c) Recessive autosomal gene
-
0%
d) Dominant autosomal gene