According to the acid-growth hypothesis, auxin causes increased acidity in cell walls, which then
activates ____ that disrupt(s) bonds between cellulose microfibrils, allowing cell expansion.
a. a membrane potential
b. AUX1 transporters
c. proteins called expansins
d. an mRNA
e. K+ ions
C
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Which figure correctly illustrates the mechanism of action of the sodium-potassium pump?
A. A
B. B
C. C
D. D
Pneumatophores of black mangroves are:
a. prop roots. b. aerial roots. c. germinated seeds. d. pores on leaves. e. salt-excreting structures.
Birds are thought to have evolved from
dinosaurs. In considering birds and comparing them to dinosaurs, which of the following would be a derived trait? a. feathers b. legs c. eyes d. toothlessness e. bones
Metanephridial organs are common in:
a. mollusks. b. flatworms. c. cnidarians. d. sponges. e. insects