is the specialized field of study that examines fossils and other clues to past life or environmental conditions.
A. Astrology
B. Genetics
C. Geology
D. Microevolution
E. Paleontology
E. Paleontology
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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.
For glycolysis to begin,
a. glucose must enter the mitochondria. b. there must be an input of energy from ATP. c. oxygen must be available. d. some hydrogen acceptors must be available. e. none of these needs to occur
What hormone(s) can be used commercially to
prolong the shelf life of cut flowers? a. abscisic acid b. cytokinins c. auxins d. ABA e. ethylene
Which of the following is NOT a hormone?
a. gastrin b. secretin c. mucin d. cholecystokinin e. leptin