26. Supercoiling refers to the extra turns in the structure of ds DNA due to the action of
A. DNA gyrase
B. DNA gyrase
C. RNA gyrase
D. RNA gyrase
27. The tissue structure deteriorates as the virus multiplies. This deterioration is called
A. aneuploidy
B. protopathic effect
C. cytopathic effect
D. none of these
28. The structural abnormality of cells is termed as
A. hyperplasia
B. anaplasia
C. metastasis
D. all of these
29. The penetration of animal viruses into attached cells occurs by mechanisms consisting of engulfment of whole virions by the cells in a phagocytic process called
A. viropexis
B. viropexis
C. ectodesmata
D. viropexis
30. Viropexis takes place in the phagocytic vacuoles and is due to the action of enzymes
A. DNA gyrase
B. lysosomal protease
C. lysosomal lipase
D. all of these