21. The volume enclosed by the plasma membrane of plant cells is often much larger than the corresponding volume in animal cells. The most reasonable explanation for this observation is that
a. plant cells are capable of having a much higher surface-to-volume ratio than animal cells.
b. plant cells have a much more highly convoluted (folded) plasma membrane than animal cells.
c. plant cells contain a large vacuole that reduces the volume of the cytoplasm.
d. animal cells are more spherical, while plant cells are elongated.
e. the basic functions of plant cells are very different from those of animal cells.
c. plant cells contain a large vacuole that reduces the volume of the cytoplasm.
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Secondary spermatocytes are produced in the first meiotic division. Indicate whether the statement is true or false
The model that assumes that evolution proceeds with slow successive change in a given evolutionary line is referred to as
A. the sympatric model. B. successive descent model. C. gradualism. D. the allopatric model. E. punctuated equilibrium.
Which of the following produces NADPH?
A) the pentose phosphate pathway only B) the Calvin-Benson cycle only C) the Embden-Meyerhof pathway only D) both the Embden-Meyerhof and Calvin-Benson cycle pathways E) both the pentose phosphate and Entner-Doudoroff pathways
The plants and animals now present on acreage from which the trees were removed ten years earlier
represent a. primary succession. b. a climax forest. c. pioneer species. d. secondary succession. e. species introductions.