Ectoderm can give rise to ; mesoderm can give rise to ; endoderm can give rise to . A) muscle ... the outer covering of the animal ... the central nervous system B) the lining of the digestive tract ... muscle ... the outer covering of the animal C) the central nervous system ... the outer covering of the animal ... the lining of the digestive tube D) the central nervous system ... muscle ... the lining of the digestive tube E) muscle ... the outer covering of the animal ... the lining of the digestive tube

Water pollution cannot only affect the earth's water supply but it can also affect the soil true or false

Which of the following statements describes the lysogenic cycle of lambda (λ) phage? a) after infection, the viral genes immediately turn the host cell into a lambda-producing factory, and the host cell then lyses.b) most of the prophage genes are activated by the product of a particular prophage gene.c) the phage genome replicates along with the host genome.d) the phage dna is copied and exits the cell as a phage.

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.