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

In one polynucleotide chain of a DNA molecule the ratio of A + T / G + C is 0.3. What is the A + G / T + C ratio of the entire DNA molecule:

(1) 0.3                 

(2) 0.6                 

(3) 1.2                 

(4) 1

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

The difference(s) between mRNA and tRNA is / are that:
A. mRNA has more elaborated 3-dimensional structure due to extensive base-pairing.
B. tRNA has more elaborated 3-dimensional structure due to extensive pairing.
C. tRNA is usually smaller than mRNA.
D. mRNA bears anticodon but tRNA has codons.
(1) A, C                   

(2) A, B, C, D                 

(3) B, C                   

(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

In prokaryotes, gene regulation occurs at the level of:

(1) Transcription                               

(2) Translation

(3) Post transcription                         

(4) Post translation

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