____ is the degree of adaptation to a specific
environment.
a. Fecundity
b. Fertility
c. Fitness
d. Adaptation
e. Natural selection
C
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The normal microbiota provides protection against potentially harmful organisms and stimulates the immune system. Why would the immune responses to members of the normal microbiota cross-react with pathogens?
A. Because one person's normal microbiota is another person's pathogen-when we pick up "normal" microbes from a different person, they will always cause infection within us. B. Because pathogens are oftentimes more virulent strains of our own normal microbial microbiota, so they will "look" roughly the same to our immune system (and be acted upon by our immune responses). C. Because the normal microbiota keeps the adaptive immune responses tuned up, active, and ready to respond to broad, general categories of microbes (i.e., Gram-positive vs. Gram-negative microbes, viruses, etc.). D. Because the immune system is a "use it or lose it" system. If it isn't used on a regular basis, we completely lose the ability to respond to pathogens. The normal microbiota keeps the system going so that it can be ready to respond to such pathogens when we're exposed to them.
Because glucose is a large molecule, it crosses the membrane through ____________________ diffusion. Fill in the blank(s) with the appropriate word(s)
The cardiovascular system is highly protected from microbial infection because
A. it is so close to the skin that even minor injuries could lead to major infection. B. it is the only body system that has no normal microbiota. C. it is the only body system that is liquid-based, i.e., with blood. D. failure to do so will result in a systemic infection.
You would know a dividing cell was a plant cell rather than an animal cell if you saw that ________________.
Fill in the blank(s) with the appropriate word(s).