The brain region responsible for producing hormones that are secreted by the pituitary gland is the
A. medulla oblongata.
B. hypothalamus.
C. cerebellum.
D. thalamus.
E. cerebrum.
Answer: B
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Fungi that are important for fermentation of fruits
A. are yeasts. B. are facultative anaerobes. C. grow well at acid pH. D. secrete enzymes that degrade organic molecules. E. All of the choices are correct.
Which scenario is an example of commensalism?
a. acacia trees coevolved with ant colonies that protect the tree from herbivores b. bacteria provide glucose to legume plants c. cattle egrets feed on insects flushed out from the grass by cattle d. plants coevolved with their pollinators
Which of the following statements regarding chemotaxis is incorrect?
A. In a tumble, the flagellum reverses direction, causing the cell to stop moving and change course. B. When a cell detects a nutrient gradient, it will increase the frequency of runs to move toward the nutrient. C. The fuel for flagellar motion is not ATP, but a proton gradient. D. In a cell with peritrichous flagella, each flagellum moves individually but in a coordinated direction during a run.
Male guppies are known for their bright colors. Having bright colors attracts mates, but it also attracts predators. So in an environment with a lot of predators, male guppies have more dull colors. In an experiment, guppies were removed from an area
with predators to an area without predators. Over a period of 12 months the population became much more colorful. This is an example of a response to: A) disruptive selection. B) mutation. C) directional selection. D) stabilizing selection.