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.
Answer: B
You might also like to view...
Typically, these bacteria would be captured and ingested, before they become established, by
a type of phagocyte called a(n) __________.
a. macrophage b. histamine c. antigen d. adaptive response
People in developed nations use enormous quantities of resources. Extracting and using these resources does irreparable harm to the planet. What are some things that individuals can do to reduce their impact on the planet and live sustainably?
What will be an ideal response?
Which step in the evolution of life is the most
complex and probably occurred last? a. formation of DNA b. formation of protein-RNA systems c. formation of membrane-bound proto-cells d. spontaneous formation of organic compounds under abiotic conditions e. formation of ATP
Archaeal membranes contain which of the following lipids?
A. Glycolipids B. Sulfolipids C. Phospholipids D. All of the choices are correct.