Virus and Operon

what is an operon?

• a part of a ribsome
• a part of a Rna
• a unit made up of linked genes that code for proteins needed to do a specific task
• needed for dna replication

A protein that binds to the operator and blocks the RNA polymerase

• regulator
• repressor
• activator
• corepressor

What is the name of the stretch of DNA where RNA polymerase binds?

• operator
• promoter
• enhancer
• origin

The lac operon genes only become expressed if:

• lactose binds to the repressor
• glucose binds to the repressor
• lactose binds to the operator
• the repressor binds to the operator

In the lac operon model the genes within the operon will be expressed if:

• lactose is absent in the cell
• glucose is present in the cell
• lactose is present in the cell

What type of operon is the trp (tryptophan) operon?

• inducible
• repressible
• positive control
• promoible

What do viruses need to reproduce?

• they need genetic material
• They need a host cell
• They need  bacteria
• They need insulin

What part of the phage is the DNA?

• A
• B
• C
• D

Which viral life cycle kills its host cell by lysing?

• lytic
• mitosis
• lysogenic
• S phase

Which of these is a plant virus?

• tobacco mosaic virus
• bacteriophage
• influenza
• polio