Organisms that live in habitats with high levels of competition are more likely to produce defensive chemicals than those that live with little competition
Indicate whether the statement is true or false
TRUE
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Penicillin-binding proteins
A. primarily function in the cell to bind to beta-lactam drugs. B. are enzymes. C. are involved in cell wall synthesis. D. inhibit non-growing bacteria. E. are enzymes AND are involved in cell wall synthesis.
Physician Edward Jenner promoted the use of cowpox, a harmless pathogen related to the dangerous smallpox virus, as a vaccination to provide patients immunity from future smallpox epidemics. This is an example of
A. developing high levels of complement. B. passive immunity. C. developing high levels of interferon although Jenner did not realize these diseases were viral. D. active immunity. E. an inflammatory response that decreased the IgE production and increased T cells.
What polysaccharide forms the long, tough fibers found in plant cell walls?
A. chitin B. cellulose C. amylopectin D. glycogen E. starch
A consequence of the way hormones, as compared to neurotransmitters, get to their target cells is that hormones:
A) cannot maintain homeostasis. B) must be larger molecules. C) would be slower to act. D) must be proteins. E) can be lipids.