Specialized food-conducting cells in vascular plants, known as ________, distribute sugars and other substances throughout the plant.
A. Phloem
B. Stomata
C. Tracheids
D. Meristems
E. Xylem
Answer: A. Phloem
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The division of the cell's cytoplasm in a eukaryotic cell is known as:
A. cytokinesis. B. cell fission. C. mitosis. D. Answers a and c are both correct.
The individualistic model of a community as an assemblage coexisting primarily of species similar in their physiological requirements was proposed by
A. Frederic Clements. B. Charles Darwin. C. Henry Allan Gleason. D. David Tilman. E. Joseph Connell.
Imagine you are entering a darkened cavern. You are excited, but also a little nervous. Your heart rate quickens, your blood pressure rises slightly, and your digestive system activity decreases as blood is diverted to your muscles—all changes that prepare you should you need to move rapidly. This type of change is an example of:
A. positive feedback control. B. negative feedback control. C. a failure of homeostasis. D. feedforward regulation. E. open loop feedback.
If the Hardy-Weinberg conditions are met,
A. gene frequencies will change steadily. B. evolution will occur. C. speciation will occur. D. gene frequencies will remain constant.