Which of the following statements about the angiosperm embryo sac is false?
A. It is the gametophyte generation of the plant.
B. The embryo sac nuclei are the product of mitotic division of a megaspore.
C. The synergids flank the egg cell.
D. It contains eight nuclei.
E. The nuclei within the embryo sac are diploid.
Answer: E
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Contraction of a skeletal muscle cell is initiated by the
A) release of acetylcholine by a neuron terminating at the neuromuscular junction. B) release of calcium ions by the neuron into the neuromuscular junction. C) electrical current traveling from the neuron directly into the muscle cell. D) hormones delivered by the blood supply to the nearby tissue. E) release of sodium ions by the neuron into the neuromuscular junction.
What compound provides the reducing power for Calvin cycle reactions?
A) ATP B) NADH C) NADP+ D) NADPH
Which of the following is a J-shaped muscular sac that serves in the temporary storage of masticated food while digestive enzymes and HCl are released to digest proteins?
A) colon B) esophagus C) stomach D) large intestines
You are studying leaf size in a natural population of plants. The second season is particularly dry, and the following year the average leaf size in the population is smaller than the year before. But the amount of overall variation is the same, and the
population size hasn't changed. Also, you've done experiments that show that small leaves are better adapted to dry conditions than are large leaves. Which of the following has occurred? A) stabilizing selection B) disruptive selection C) genetic drift D) directional selection