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.
B
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Scuba divers use a BCD to control buoyancy. It is essentially a bag that can be inflated or deflated to prevent excessive sinking or floating. How do bony fish accomplish this?
A. They pump their operculum. B. They adjust the level of gasses in their swim bladder. C. They adjust their position using the pectoral and pelvic fins. D. They swim rapidly to saturate the blood with oxygen.
Which feature is found in DNA?
A) Adenine (A) forms a base pair with cytosine (C). B) The backbone of each strand is composed of alternating sugar and phosphate groups. C) Complementary strands are held together by ionic bonds. D) DNA remains condensed in a short linear form both before and after cell division.
A protein being synthesized by a cell for export would follow which pathway in the cell?
A. ribosome to cell membrane B. ribosome to lysosome to endoplasmic reticulum to Golgi apparatus to cell membrane C. ribosome to endoplasmic reticulum to Golgi apparatus to cell membrane D. ribosome to Golgi apparatus to endoplasmic reticulum to cell membrane
Which form of diabetes is most common?
a. type 1 b. type 3 c. type 2 d. gestational