______ is the observable response of organisms to external or internal stimuli.
A. Ecology
B. Behavioral ecology
C. Behavior
D. Pheromonal mediation
E. Allomonal mediation
C. Behavior
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If the connection between a gland and the epithelial membrane is maintained as a duct, the gland is called a(n) ___________ gland.
A. exocrine B. endocrine C. lymph D. sebaceous E. adrenal
Which of the following describes the sepal of a flower?
a. a modified leaf that encloses the bud b. a long thin structure that links the stigma to the ovary c. a thin stalk that links the anther to the flower’s base d. a sac-like structure at the tip of the stamen
What would happen to people exposed to a chemical warfare agent that blocked acetylcholine from binding to muscle receptors?
A) Action potentials would be continuously generated, causing convulsive muscle contractions. B) Muscle contractions would be prevented, causing paralysis. C) Muscle contractions could still occur, but relaxation of the muscle would be impaired. D) Action potentials would be continuously generated, causing convulsive muscle contractions; muscle contractions would then be prevented, causing paralysis.
A polypeptide is a long chain of amino acids bonded together by __________.
A. phosphodiester bonds B. hydration reactions C. amino acid unique side groups D. peptide bonds