Hamilton explained the origin of altruism in selected insect societies with his kin selection model of sex determination. Since males are haploid and females are diploid, the workers share a very high proportion of alleles, theoretically as high as 75%. What is this called?
A. Haplodiploidy
B. Haploidy
C. Diploidy
D. Parthenogenesis
E. Altruism
Answer: A
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How is plant cell cytokinesis different from animal cell cytokinesis?
A) The contractile filaments found in plant cells are structures composed of carbohydrates; the cleavage furrow in animal cells is composed of contractile phospholipids. B) Plant cells deposit vesicles containing cell-wall building blocks on the metaphase plate; animal cells form a cleavage furrow. C) The structural proteins of plant cells separate the two cells; in animal cells, a cell membrane separates the two daughter cells. D) Plant cells divide after metaphase but before anaphase; animal cells divide after anaphase.
When fat enters the duodenum, it stimulates release of ____
a. amylase b. cholecystokinin c. gastrin d. secretin e. trypsin
Why did the smooth muscle in cultured strips of aorta not respond to acetylcholine by relaxing, while the smooth muscle of aortic rings did?
a) The endothelial layer in aortal strips was abnormally thickened, while in aortal rings it was not. b) Acetylcholine in the strips could not penetrate to the muscle cells while in the rings it could. c) Smooth muscle cells in aortic strips are physically incapable of relaxing under any circumstances. d) The delicate endothelial layer in aortal strips had been rubbed away during dissection, while in aortal rings it remained intact. e) Smooth muscle cells in aortic rings express acetylcholine receptors, while those in strips do not.
Which area contains aquatic organisms that can tolerate exposure to air?
A) Aphotic zone B) Coral reefs C) Ocean floor D) Intertidal zone E) Twilight region