21. Bactriophages absorb to a bacterial surface and inject the phage DNA through the
A. cell wall into cytosol
B. cell wall into plasmamembrane
C. both (a) and (b)
D. cell wall into endoplasmic reticulum
22. In a PCR reaction after four cycles, each molecule of a duplex DNA will give rise to
A. 16 single strands of DNA
B. 16 double stranded DNA
C. 18 single strands of DNA
D. 18 double stranded DNA
23. Additional mono saccharides are added in Golgi to produce
A. either high mannose type oligosaccharide or a complex type
B. either fructose type monosaccharide or a complex type
C. either high sucrose type polysaccharide or a complex type
D. none of the above
24. The PCR, polymerase chain reaction is becoming the method of choice for
A. Alteration of gene
B. screening gene
C. sterilization of gene
D. all of these
25. Northern blotting is
A. widely different than southern blotting
B. another name for southern blotting
C. analogous to southern blotting
D. none of the above