40.地表上海水覆蓋的面積的百分比為何？
(A)65
(B)83
(C)71
(D)52。

1. The liver is involved in detoxification of many poisons and drugs. Which of the following structures is primarily involved in this process and therefore abundant in liver cells? (A) Transport vesicles (B) smooth ER (C) Golgi apparatus (D) Nuclear envelope

2. Which of the following is a protein synthesized at specific times during the cell cycle that associates with a kinase to form a catalytically active complex? (A) PDGF (B) MPF (C) protein kinase (D) cyclin

3. The hormone primarily responsible for setting the basal metabolic rate and for promoting the maturation of the brain is (A) TSH. (B) thyroxine. (C) ACTH. (D) cortisol.

4. Which of the following cells of the pancreas secrete insulin? (A) exocrine cells (B) alpha cells (C) beta cells (D) delta cells

5. A biologist discovers two populations of wolf spiders whose members appear identical. Members of one population are found in the leaf litter deep within the woods. Members of the other population are found in the grass at the edge of the woods. The biologist decides to designate the members of the two populations as two separate species. Which species concept is this biologist most closely utilizing? (A) phylogenetic (B) ecological (C) Physiological (D) morphological

6. Which group includes members that are important primary producers in ocean food webs, causes red tides that kill many fish, and may even be carnivorous? (A) ciliates (B) apicomplexans (C) dinoflagellates (D) brown algae

7. The blastopore denotes the presence of an endoderm-lined cavity in the developing embryo, a cavity that is  known as the (A) archenteron. (B) blastula. (C) coelom. (D) blastocoel. .

8. What type of specialized junction connects epithelial cells lining the renal tubules? (A) tight junctions (B) desmosomes (C) gap junctions (D) intercalated disks

9. In both males and females, gonadotropin secretion by the anterior pituitary is stimulated by (A) GnRH. (B) FSH. (C) GHRH. (D) androgens.

10. The corpus luteum is maintained for the first 10 weeks of pregnancy by (A) progesterone. (B) estrogen. (C) hCG. (D) LH.

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