The rate of migration of a DNA molecule in an electrophoresis depends on which two factors（）
A. conformation （or shape）
B. charge-to-mass ratio
C. temperature
D. viscosity
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Choose the correct statement for cosmids（）
A. It can be regarded as almost the same lambda vector
B. Less amount of phage DNA is deleted
Cos packaging sites are left
D. It doesn’t contains a origin of replication
Which of the following statement is true in case of Reverse transcriptase（）
A. Involved in the replication of bacteriophage
B. Uses RNA as a template
C. Used in complementary DNA cloning
D. Synthesizes DNA from RNA
What are not the functions of a polynucleotide kinase（）
A. Removal of the phosphate group from 5’ end
B. Removal of the phosphate group from 3’ end
C. Addition of phosphate group on 5’ end
D. Addition of phosphate group on 3’ end
Choose the correct statement with respect to lysogen and prophage（）
A. The integrated phage is called as lysogen
B. The infected bacterial cell is called a prophage
C. If there is only growth of few lysogens, the E. coli lawn would be turbid
D. If lysogens won’t be formed, the plaques won’t be clear
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