Phospholipids spontaneously form a bilayer in an aqueous solution. Why do the heads of the phospholipids point out and the tails point toward one another?
A) The tails are nonpolar and form hydrogen bonds with one another.
B) The heads are repelled by the water inside and outside the cell.
C) The tails are repelled by the aqueous environment, and the heads will directly interact with the aqueous solution.
C
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The skin of sharks is covered with scales called:
a. placoid. b. cycloid. c. ctenoid. d. ganoid. e. circular.
The posterior pituitary secretions produce their effects
a. on the gonads. b. in the thyroid glands. c. on adrenal glands. d. on mammary glands. e. on thirst mechanism.
Nearly two dozen different alleles for the same gene can determine eye color in fruit flies. This is an example of
A. multiple alleles. B. polygenic inheritance. C. pleiotropy. D. incomplete dominance.
What is the term given to the theory that states that the fertilized egg contains a complete miniature adult?
A) conjugation B) cell theory C) preformation D) transduction E) transformation