Question No:1
In both DNA and RNA, heterocyclic base and phosphate ester linkages are at
(A) C5 – and C 2 –(B) C 2 – and C 5 – respectively of the sugar molecule.
(C) C t – and C 5 – respectively of the sugar molecule.
(D) C 5 – and C 1 – respectively of the sugar molecule
Question No:2
Number of base pairs present in total DNA of human cell (human genome) is around
(A) 3.3×10 5
(B) 3.3×10 8
(C) 3.3×10 7
(D) 3.3×10 9
Question No:3
Which of the following processes is “semi conservative”?
(A) Translation
(B) Transcription
(C) Replication
(D) Reverse transcription
Question No:4
The relationship between the nucleotide triplets and the amino acids is called
(A) Translation
(B) Transcription
(C) Replication
(D) Genetic code
Question No:5
Number of C=0 groups in thymine and in X are equal. Now, X is
(A) Cytosine
(B) Uracil
(C) Adenine
(D) Guanine
Question No:6
In the nucleotide namely adenosine-5′-tri phosphate, the sequence of linkages among N (base), C(sugar) and P(phosphate) is
(A) C-P-N-P-P
(B) N-C-P-P-P
(C) P-C-N-P-P
(D) P-P-P-C-N
Question No:7
Incorrect relationship regarding all types of living species is
(A) A+G =C+T
(B) A+G=C+U
(C) (A+T)/(C+G)=1
(D) (A+T)/(C+G)#0
Question No:8
In nucleosides, both base and sugar are joined by
(A) Hydrogen bond
(B) N-glycoside bond
(C) -S-S-bond
(D) (a) and (c)
Question No:9
The number of hydrogen bonds present in the sequence of a stretch of a double helical DNA 5 1 ATGCCTAA 3 1 is
(A) 16
(B) 19
(C) 24
(D) 20
Question No:10
Two samples of DNA, A and B have melting points 340K and 350 K respectively. This is because
(A) B has more GC content than A
(B) A has more GC content than B
(C) A has more AT content than B
(D) Both have same AT content.
Question No:11
Which one of the following sequence of groups in AMP?
(A) Sugar – base -phosphate
(B) Base-sugar-phosphate
(C) Phosphate -base-sugar
(D) Phosphate-acid-sugar
Question No:12
The process in which strands of melted DNA hybridise on cooling is known as
(A) Melting
(B) Freezing
(C) Annealing
(D) Denaturation
Question No:13
Through this experiment Avery, Macleod and Me Carty had showed that DNA is the sole carrier of genetic information
(A) Transcription
(B) Transduction
(C) Transformation
(D) Translocation
Question No:14
The ratio of phosphates, sugars and nitrogen bases in ds – DNA
(A) 1:2:1
(B) 1:1:1
(C) 1:1:2
(D) 3:1:1
Question No:15
Chargaff did not establish that
(A) A:T = 1 : 1
(B) G : C = 1 : 1
(C) A+G:T+C #1:1
(D) A+T: G+C # 1:1
Question No:16
Length of DNA is 1700A 0. The number of nucleotides it contains is
(A) 1000
(B) 500
(C) 3400
(D) 850
Question No:17
The minimum and maximum number of hydrogen bonds found in a coil of ds-DNA respectively are
(A) 10 and 10
(B) 20 and 20
(C) 30 and 20
(D) 20 and 30
Question No:18
The most unstable molecule is
(A) ss DNA
(B) ds RNA
(C) m RNA
(D) t RNA
Question No:19
RNA which is almost in the form of a regular double helix is
(A) rRNA
(B) m RNA
(C) ds RNA
(D) t RNA
Question No:20
t-RNA cannot be called
(A) s RNA
(B) Adaptor RNA
(C) Interpreter of genetic code
(D) Genetic RNA