Latent infections are those that:
a. develop and progress slowly.
b. develop quickly and end soon.
c. exist as a silent phase in which the agent is causing no notable effect.
d. develop quickly but last long.
C
Some pathogens, particularly viruses, lie dormant in the body for a time before suddenly becom-ing active again.
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Many important cellular functions in eukaryotic cells occur within membrane-enclosed organelles, such as cellular respiration occurring within the mitochondria. The membranes of the mitochondria provide a place for enzymes needed for cellular respiration to anchor and function. Prokaryotic cells must also carry out respiration but do not have mitochondria. Where is the most likely place that enzymes needed for cellular respiration are anchored and functioning?
a. the cell wall c. the cytosol b. the chromosome d. the plasma membrane
One way embryonic cells can learn their position in an embryo is by detecting the concentration of a
A. morphogen B. DNA polymerase C. gene (segment of DNA) encoding a transcription factor
Acacia trees often have ants that live on them. The ants feed on materials produced by special structures called nectaries, which the tree produces. The ants will attack other animals that begin to feed on the tree and will even cut off small branches of other trees that come in contact with "their" tree. The relationship between Acacia trees and ants is called
A. mutualism. B. competition. C. predator/prey. D. parasite/host.
The CO2 produced in respiration comes mainly from
A. glycolysis. B. the Krebs cycle. C. the electron transport chain. D. All of the above processes generate CO2.