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

Go through the following diagram of Nucleosome (structural unit of chromatin). Identify its componential parts indicated by A, B and C:

If the DNA of this virus was labeled with 32P and the protein of the virus was labeled with 35S, which molecule(s) would be present inside the cells?
(1) 35S and 32P

(2) 35S only

(3) 32P only

(4) Neither molecule would be present inside the cell