At __________, the fusion of two gametes produces
a __________. Fill in the blank(s) with the appropriate word(s).
Answer: fertilization; zygote
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Because oxygen is more electronegative than hydrogen, the water molecule is:
A. hydrophobic. B. hydrophilic. C. nonpolar. D. ionic. E. polar.
Which of the following statements is NOT true of megaspores?
A. Megaspores produce female gametophytes. B. Megaspores are larger than microspores. C. A megaspore is a kind of spore of a seed plant. D. The cells of the walls of the megasporangium are diploid but the megaspores themselves are haploid. E. Megaspores are diploid.
The chance of a child having albinism when both of his parents are heterozygous for the disorder is ____ percent
a. 0 b. 25 c. 33 d. 50 e. 75
Which statement best represents the difference between ectotherms and endotherms?
a. Ectotherms rely on homeostatic mechanisms to maintain body temperature. b. Ectotherms have a very high daily energy expenditure. c. Endotherms rely on behavior modification to maintain their body temperature. d. Ectotherms derive heat from metabolic processes. e. Ectotherms animals outnumber endotherms.