Isotopes used in proving semiconservative replication of DNA were:
(1) 14N 14C
(2) 14N 15N
(3) 14N 31P
(4) 14C 31P
Column-I Column-II
I. Genome of ϕ 174 bacteriophage A. Ribozyme, RNAase
II. Purine B. 5386 Nucleotides
III. Catalytic RNA C. Adenine and Guanine
IV. Any chemical change in DNA D. Mutation
The correct match is:
(1) I - D, II - B, III - A, IV - C
(2) I - B, II - A, III - D, IV - C
(3) I - D, II - C, III - A, IV - B
(4) I - B, II - C, III - A, IV - D
Column-I Column-II
I. Operator site A. Binding site for RNA polymerase
II. Promoter site B. Binding site for repressor molecule
III. Structural gene C. Codes for enzyme protein
IV. Regulator gene D. Code for repressor molecules
The correct match is:
(1) I - B, II - A, III - C, IV - D
(2) I - B, II - A, III - D, IV - C
(3) I - D, II - C, III - A, IV - B
(4) I - B, II - C, III - A, IV - D
In chromosome, DNA is associated with:
A. Negatively charged proteins B. Positively charged proteins
C. Neutral proteins D. NHC protein
(1) B, D
(2) A, B, C, D
(3) B, C, D
(4) A, B, C
Heterochromatin:
A. Is more densely packed B. Is stains dark
C. Is transcriptionally active D. Is transcriptionally inactive
(1) A, C
(2) A, B, C, D
(3) B, C, D
(4) A, B, D
In 1953, James Watson and F. Crick proposed the Double Helix model of DNA and got Nobel Prize. Their model of DNA was based on:
A. X-ray diffraction of DNA produced by M. Wilkins and R. Franklin
B. Griffith’s experiment.
C. Hershey - Chase experiment
D. Chargaff’s rule of base equivalence (A + G / T + C = 1)
(1) A, D
(2) A, B, C, D
(3) B, C, D
(4) A, B, C
DNA polymerase:
A. Is the main enzyme for RNA synthesis
B. Is DNA dependent DNA polymerizing enzyme
C. Is a highly efficient enzyme
D. Is catalyzes a reaction with a high degree of accuracy
(1) C, D
(2) A, B, C, D
(3) B, C, D
(4) A, B, C
In eukaryotes the gene expression is regulated at:
A. Transcriptional level
B. Processing level
C. Transport of mRNA from nucleus to the cytoplasm
D. Translational level
(1) A, C
(2) A, B, C, D
(3) B, C, D
(4) A, B, C
Characteristic(s) of most DNA is / are:
A. A pairs with T by 2 hydrogen bonds.
B. Antipolarity of complementary chains
C. 20Aº diameter
D. 10 bps/turn
(1) A, C
(2) A, B, C, D
(3) B, C, D
(4) A, B, C
A. DNA polymorphism plays important role in evolution and speciation.
B. 99.9% nucleotides bases are exactly same in all people
C. Chromosome 1 has the fewest genes (23) and Y-chromosomes has most genes (2968)
D. BAC and YAC have been used in Human Genome Project.
(1) All correct
(2) All incorrect
(3) A, B, D are correct
(4) B, C, D are correct