In gymnosperms, the formation of the female gametophyte takes place in the
a. microspores.
b. megaspores.
c. macrospores.
d. ovule.
e. rhizomes.
B
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Which of the following statements does NOT correctly describe differences between larval and adult tunicates?
A. Larval tunicates have a conspicuous notochord that is lost by the time they become adults. B. Larval tunicates have a hollow dorsal nerve cord that is reduced to only a ganglion in the adult. C. The tail of the larval tunicate is lost by the time it transforms into an adult. D. The pharynx of the larval tunicate becomes more prominent in the adult. E. The larval tunicate lacks an incurrent and excurrent siphon but the adult has both structures.
What is the correct rank order for relative toxicity (most to least) of the primary nitrogenous wastes generated by different animals?
A. ammonia ? urea ? uric acid B. uric acid ? ammonia ? urea C. urea ? uric acid ? ammonia D. ammonia ? uric acid ? urea E. urea ? ammonia ? uric acid
In oxidation-reduction reactions, ____
a. both molecules give up electrons b. both molecules gain electrons c. cells harvest energy d. the molecule that accepts electrons is reduced e. hydrogen ions are usually absorbed
Which equation best describes the relationship between an ion gradient and the equilibrium potential that will form when the membrane is permeable to only that ion?
A) Huxley equation B) Goldman equation C) Nernst equation D) Hodgkin equation E) Katz equation