What best describes whether a virus is likely to infect a particular cell?
A. The initial choice is random but once a cell type is chosen it becomes the preferred host.
B. Viruses infect the first cells they encounter.
C. If a host cell is weakened, viruses are likely to infect it.
D. Viruses only attack epithelial cells, such as the cells lining the lungs.
E. A virus will only infect host cells with the correct surface receptors.
Answer: E
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A) aerobes / the initial step of methane oxidation requires O2 B) anaerobes / methane is produced in anaerobic environments C) fermenters / methane only provides enough energy for fermentation D) heterotrophs / methane does not provide enough carbon for growth
The grinding apparatus of the digestive system of the crayfish is/are the
(a) oral teeth. (b) gizzard. (c) pharyngeal jaw. (d) gastric mill.
Proteins that are destined to become associated with the inner surface of the plasma membrane are:a
made on free ribosomes in the cytoplasm. b. manufactured in the same way as protein hormones. c. made on ribosomes located on the rough endoplasmic reticulum. d. transported to the plasma membrane within a secretory vesicle. e. manufactured in the same way as proteins destined to become external peripheral proteins.
Which of the following infectious particles is most susceptible to damage?
A) naked capsid virus B) enveloped virus C) prions D) bacteriophage E) both naked capsid viruses and prions