Phagocytosis is a form of ____
a. diffusion
b. endocytosis
c. exocytosis
d. osmosis
e. facilitated diffusion
ANSWER: b
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Which of the following explains why leaf primordia develop in spiral or whorled patterns around the stem tip?
A. accumulation of auxin in the stem tip B. depletion of auxin near leaf primordia C. accumulation of auxin in leaf primordia D. loosening of cell walls E. None of these choices is correct
The large intestine begins as the
a. appendix. b. duodenum. c. ileum. d. cecum. e. jejunum.
Prezygotic reproductive isolation can occur ____.
A. during fertilization B. during embryo development C. during fetal development D. after birth E. during meiosis
What is the function of companion cells?
A. These cells provide metabolic support to vessel elements. B. These cells provide metabolic support to sieve elements. C. These cells provide metabolic support to tracheids. D. These cells prevent water from entering the endodermis. E. These cells control the opening and closing of stomata.