From the perspective of diversity, within a region, distributions of species should reflect:
A) distribution of suitable habitats.
B) ability to disperse to a particular locality.
C) both A and B
D) neither A nor B
Ans: A) distribution of suitable habitats.
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In spite of their heterogeneity, steroid hormones:
A. have the same effect on different types of cells. B. bind to cell-surface receptors. C. bind intracellular receptors to form complexes that migrate to the nucleus. D. are hydrophilic small molecules that bind to intracellular receptors. E. facilitate the initiation of translation by ribosomes.
If you rub the scaled skin of a shark, it feels rough when you move your hand from tail to head but smooth when you move from head to tail. What is a major advantage of the scales being oriented this way?
A. To better prevent water loss from the body tissues B. To enable the shark to orient itself in space and detect prey C. To keep the shark afloat in the water D. To better protect the shark from predators E. To counteract friction as the shark swims through the water
Which structure is the major transport system for sperm?
a. testes b. epididymis c. vas deferens d. seminal vesicle e. prostate gland
In a human female, which of the following would be inhibited by an inhibition of LH?
a. maturation of follicles b. secretion of estrogen c. secretion of FSH d. secretion of GnRH