Which of the following statements about oogenesis is false?
A. None of the answer options is false.
B. It can take as long as 50 years for some
primary oocytes to complete oogenesis.
C. Primary oocytes form when a female is a
fetus in her mother's uterus.
D. Meiotic divisions are asymmetrical in
oogenesis.
E. Fertilization occurs before the final round
of meiotic divisions in humans.
A
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Nerve gas has its effect by causing the
accumulation of ___ in the synaptic cleft.
a. dopamine b. serotonin c. acetylcholine d. epinephrin e. an endorphin
Where are the areas of highest NPP?
A) equator B) arctic C) temperate region D) Saharan desert
Plants are a:
a. polyphyletic group. b. monophyletic group. c. group without a common ancestor. d. group with many ancestors. e. paraphyletic group.
Angiosperms have two types of xylem tubes, each composed of one cell type, either ____ or ____.
A. vessel elements; companion cells B. sieve elements; companion cells C. sieve elements; tracheids D. vessel elements; sieve elements E. vessel elements; tracheids