Seeds appeared in the fossil record by
A. 100 million years ago.
B. 365 million years ago.
C. 545 million years ago.
D. 780 million years ago.
E. a billion years ago.
B. 365 million years ago.
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Which of the following sequence of events of fertilization is in the proper order?
A. acrosomal reaction, binding of sperm to egg membrane, fast block to polyspermy, increase in egg cytosolic calcium, and then the slow block to polyspermy B. binding of sperm to egg membrane, acrosomal reaction, fast block to polyspermy, slow block to polyspermy, and then an increase in egg cytosolic calcium C. binding of sperm to egg membrane, acrosomal reaction, fast block to polyspermy, increase in egg cytosolic calcium, and then the slow block to polyspermy D. acrosomal reaction, fast block to polyspermy, binding of sperm to egg membrane, increase in egg cytosolic calcium, and then the slow block to polyspermy E. acrosomal reaction, fast block to polyspermy, binding of sperm to egg membrane, slow block to polyspermy, and then an increase in egg cytosolic calcium
What is the collective name for the epicotyl, shoot apical meristem, and young leaves?
a. coleptile b. radicle c. plumule d. hypocotyl
The atmospheric pressure on top of Mt. Everest is only about 238 mmHg, so the approximate partial pressure of oxygen there is
A. 50 mmHg. B. 476 mmHg. C. 186 mmHg. D. 238 mmHg. E. 2.4 mmHg.
An allele that exerts its effects whenever it is present is
a) recessive. b) dominant. c) homologous. d) homozygous. e) heterozygous.