What best describes whether a virus is likely to infect a particular cell?
A. Viruses only attack epithelial cells, such as the cells lining the lungs.
B. Viruses infect the first cells they encounter.
C. The initial choice is random but once a cell type is chosen it becomes the preferred host.
D. A virus will only infect host cells with the correct surface receptors.
E. If a host cell is weakened, viruses are likely to infect it.
Answer: D
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The active site of an enzyme
a. binds the reactants of a chemical reaction. b. does not change shape during the reaction. c. is necessary for regulation of the enzyme activity. d. can bind many different reactants. e. only acts when it is unoccupied.
A person with feces on their hands handles food and transmits it to another person through ingestion of the contaminated food. This is referred to as _____-_______ route
Fill in the blank(s) with the appropriate word(s).
Which statement about respiration is true?
A) Inhalation is a passive process. B) Exhalation is an active process during intense exercise. C) During exhalation, the pressure in the lung decreases. D) During inhalation, the diaphragm relaxes.
Discuss the necessity and benefits of the Genetic Information Nondiscrimination Act (GINA) of 2008. What will be an ideal response?