If lactose is PRESENT, the repressor (LacI) of the lac operon is bound to:

If lactose is PRESENT, the repressor (LacI) of the lac operon is bound to:
A) The lac operator
B) The lac promoter
C) RNA polymerase
D) Both A and C
E) Both B and C
F) None of the above


For the lac operon, allolactose is a(n) ______________ molecule?
D) sigma factor
C) inducer
B) corepressor
F) Both B and D
A) repressor
E) Both A and D


How does a temperate bacteriophage differ from a strictly virulent or lytic bacteriophage?
A) A temperate phage's only 'life cycle' is the lytic phase, meaning that it always kills its host cell.
B) A temperate phage can incorporate its DNA into the host genome.
C) A temperate phage does NOT bind to a specific cell receptor during host recognition and infection.
D) Both A and C
E) Both B and C


In general, animal viruses differ from bacterial viruses in that _________.
A) the entire virion of an animal virus enters the host cell
B) only the viral nucleic acid of the virion enters the animal host cell
C) animal viruses are never enveloped
D) all animal viruses are lytic
E) none of the above


What do the virions of retroviruses contain that other animal virions do not?
A) A double stranded genome
B) A single stranded genome
C) Reverse transcriptase
D) A lysozyme enzyme
E) Both C and D