Jerry has not worked out in several years. he has experienced some health issues and is realizing the importance of incorporating physical activity into his lifestyle again. which of the following activities would be most appropriate for his fitness level?
a.
running several 400-meter sprints
b.
jogging for three miles
c.
walking for 30 minutes around the neighborhood
d.
participating in a high-intensity cycling class

What do you generally see in a family when both parents are working?

What is the function of reverse transcriptase in retroviruses? a) it uses viral rna as a template for dna synthesis. b) it converts host cell rna into viral dna. c) it translates viral rna into proteins. d) it uses viral rna as a template for making complementary rna strands.

Viruses use the host's machinery to make copies of themselves. however, some human viruses require a type of replication that humans do not normally have. for example, humans normally do not have the ability to convert rna into dna. how can these types of viruses infect humans, when human cells cannot perform a particular role that the virus requires? a) the virus causes mutations in the human cells, resulting in the formation of new enzymes that are capable of performing these roles. b) the viral genome codes for specialized enzymes not in the host. c) the virus infects only those cells and species that can perform all the replication roles necessary. d) viruses can stay in a quiescent state until the host cell evolves this ability.