In the description of homeostasis, the term dynamic constancy refers to
A) a disregarded theory that suggested there were no external energy requirements to maintain cell homeostasis.
B) a constant movement toward equilibrium.
C) the direct interaction of each positive feedback system with its corresponding negative feedback system.
D) the use of ATP to initiate a cascade effect.
E) the fact that even though physical and chemical changes do occur, conditions are kept within a range.
E
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The plant hormone ____ stimulates stomata to close during a drought
a. salicylic acid b. gibberellin c. abscisic acid d. auxin e. oligosaccharin
Active transport mechanisms
a. in roots regulate what solutes enter the plant. b. in leaves help control water loss. c. operate in animal kidneys and neurons. d. do all of these. e. do none of these.
Protozoa are classified according to
A. the type of chlorophyll they have. B. the number of cilia they have. C. their method of movement. D. the environment in which they live.
Chargaff's rules for the pairing of nitrogen bases is
A. A = T and G = C. B. A+T = G+C. C. A = C and G = T. D. A = G and C = T.