Biology Mcqs

In the lytic cycle of bacteriophage the host DNA is__________?

A. Replicated
B. Turn off by the protein coat.
C. Digested into its nucleotides
D. Turned on by the removal of the protein coat

Temperate phage may exist as_____________?

A. Prophage
B. Capsid
C. Viron
D. Retrovirus

Which of the following is an RNA virus:

A. Influenza virus
B. Herpes virus
C. HBV
D. Pox virus

In the Lysogenic cycle the DNA of the bacteriophage__________________?

A. Joins the bacterial chromosomes
B. Attaches to the inner surface of the host membrane
C. Is immediately degraded when enters the host
D. Goes directly to host ribosomes for translation

Tobacco mosaic virus is__________?

A. Spherical
B. Rod Shaped
C. Tadpole like
D. Hexagonal

In life cycle of bacteriophage which step occur after attachment of prophage with the receptor site of the bacterial cell wall_____________?

A. Absorption
B. Multiplication
C. Lysogeny
D. Penetration

Which of the following disease results in Paralysis due to viral attack on C.N.S:

A. Measles
B. Herpes simplex
C. Hepatitis
D. Polio

An enzyme which can convert single stranded RNA into double stranded viral DNA is called____________?

A. DNAase
B. RNAase
C. DNA polymerase
D. Reverse Transcriptase

Which of the following is incorrect for the lysogenic cycle in life cycle of bacteriophage_____________?

A. Phage when gets incorporated with the bacterial chromosome is called prophage
B. The bacterium continues to live and reproduce normally
C. Lysogenic bacteria may get infected by the related phage
D. The cycle may convert into lytic type resulting from environmental exposure