In flowering plants, the mature male gametophyte is produced
A. within the ovule just prior to fertilization.
B. in the anther.
C. within the pollen granule during transfer.
D. when the pollen makes contact with the stigma.
E. in the pollen tube when the generative cell divides.
Answer: E
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Which of the following is NOT among the
events that may have led to the explosion of animal diversity 542 - 488 million years ago?
a. increase in oceanic carbon dioxide concentrations b. decreased gene flow caused by the breakup of the supercontinents c. evolution of predation d. mutations in homeotic genes e. all of these are among the events that led to the explosion of animal diversity 542 - 488 million years ago
Lactate fermentation transfers the electrons and hydrogen ions carried by NADH directly to ____
a. acetaldehyde b. pyruvate c. carbon dioxide d. oxygen e. myoglobin
Sensory signals are also referred to as
a. efferent. b. motor. c. reverberating. d. saltatory. e. afferent.
Protein production occurs at which TWO organelles?
What will be an ideal response?