Of the subphases of prophase I of meiosis, the phase at which mammalian egg cells are arrested for years during oogenesis is
A) leptotene.
B) zygotene.
C) pachytene.
D) diplotene.
E) diakinesis.
D) diplotene.
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An energy-liberating pathway is considered to be
A) metabolic. B) anabolic. C) catabolic. D) hydrogenation. E) all of the above
A large watermelon fruit is very heavy and contains nearly 90% water. Since the skin of a watermelon is thick and lacks stomata, transpiration does not "pull" water into the watermelon. So, how does all that water get into the fruit?
A. Water enters by osmosis from the soil. B. Water is transported in the phloem along with the sugars while they are being translocated into the fruit. C. Root pressure pushes water into the watermelon. D. Water is pumped in by active transport. E. Watermelons, like other fruit, contain an abundance of xylem.
Problem-solving is a form of
A. imprinting. B. insight learning. C. conditioning. D. instinctive behavior.
Which of the following would not be a function of the peroxisomes?
A) break down fats in the liver B) produce bile salts in the liver C) help germinating seeds convert fatty acids into molecules that can be converted to sugars D) storage of toxic materials in the cell E) metabolism that uses oxygen and releases carbon dioxide in leaves