A16-year-old boy is skateboarding, hits a curb, and falls. to break his fall, his stretches out his right hand and lands on it. his hand is sore for a few days and doesn't seem to be getting better. he presents to the ed and is found to have pain in the snuff box region. an x-ray is ordered and shows a broken bone in the palm of the hand. what is likely fractured?

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.