Which cells are held in reserve to be used for a rapid response to subsequent intruders of the same type?
a. NK cells
b. helper T cells
c. cytotoxic T cells
d. memory cells
e. B cells
d
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Which cell structure is most likely responsible for sensing gravity?
A. central vacuole B. Golgi appartus C. chloroplast D. amyloplast E. apical meristem
Which statement best describes the difference between cell division in plant and animal cells?
a. Cytokinesis occurs by formation of a cleavage furrow in animal cells, but not plant cells. b. Cytokinesis occurs by formation of a cleavage furrow in plant cells, but not animal cells. c. Centrosomes play an important role in spindle formation in plant cells, but not in animal cells. d. Chromosome replication occurs during interphase in animal cells, while in plant cells, replication occurs when the nuclear envelope disintegrates. e. Animal cells divide via the cell cycle whereas plant cells divide by binary fission.
An animal's capacity to conserve water and to
concentrate solutes for excretion in the urine is greater in a kidney with longer a. Bowman's capsules b. loops of Henle c. proximal tubules d. ureters e. afferent arterioles
Which of the following is not a function of stems?
a. modified for sexual reproduction b. absorb nutrient minerals c. produce new tissues d. transport water and dissolved nutrient minerals e. support leaves and flowers