What mammals retain their young for a long period of development within the mother's uterus?
A. placentals
B. marsupials
C. monotremes
D. no mammals retain their young within the female
Answer: A
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Which of the following factors does NOT stimulate
the stomach to pass on its contents to the small intestine? a. stress b. stimulation of mechanoreceptors in the stomach wall following a large meal c. reduced fat or acid content of chyme in the duodenum d. elation and relaxation e. all of these
The genes for hemoglobin ____
a. are found only in red blood cells b. are never regulated c. contain only introns d. are turned off in a small percentage of body cells e. are found in all body cells
The structure labeled as 9 in the accompanying figure was produced by:
a. the fertilization of two zygotes. b. meiosis in the zoosporangium. c. mitosis in the zoosporangium. d. mitosis in the resting sporangium. e. meiosis in the resting sporangium.