Which of the following is true of viruses? (2 points) They must use a host cell's metabolic enzymes and pathways to obtain energy.
They must use a host cell's ribosomes to synthesize proteins.
They must use a host cell's nucleotides for transcription and translation.

I and II only

I, II, and III

II and III only

III only

2.
Scientists construct an experimental bacteriophage that is composed of the T2 phage protein coat and T3 phage DNA. If a bacterium is infected by this phage, the new phages produced would be expected to have (2 points)

T2 protein and T3 DNA

T2 protein and T2 DNA

T3 protein and T3 DNA

T3 protein and T2 DNA

3.
In what viral reproductive cycle does the virus kill the host cell in which it is replicating? (2 points)

endocytic

lysogenic

lytic

phagocytic

4.
Why is it ineffective to treat a viral disease with antibiotics? (2 points)
Pathogenic RNA viruses have a high rate of mutation, quickly developing antibiotic resistance.
Excessive antibiotic use has resulted in most viruses evolving to be insensitive to antibiotic treatments.
Antibiotics inhibit enzymes specific to bacteria and have no effect on the enzymes encoded by viruses.

I and II only

II only

II and III only

III only
5
.
A plant raised in a sterile environment shows symptoms of a viral infection. Which of the following statements is the best explanation of this? (2 points)

The viral infection was acquired by the environment.

The viral infection was inherited from a parent.

The viral infection was developed by a mutation in the plant's genes.

The viral infection was picked up by horizontal transmission.