An intrauterine device works to prevent pregnancy by _____
a. changing the pH of the uterus so sperm cannot live
b. changing the chemistry of the uterus so sperm cannot live
c. interfering with sperm movement or implantation
d. killing sperm
e. preventing ovulation
ANSWER: c
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Color blindness is a recessive X-linked trait. A normal couple has a color-blind child. Who else in this family is probably color blind?
A. the child's maternal grandfather B. the child's maternal grandmother C. the child's paternal grandfather D. the child's paternal grandmother E. the child's maternal grandmother or grandfather
When light excites chlorophyll, the chlorophyll
molecules
a. change to carotene. b. become agitated and move rapidly. c. become radioactive. d. electrons jump to a higher energy level. e. become ionized
In humans, hair texture is an incompletely dominant trait. Curly is the dominant genotype, wavy is
heterozygous, and straight hair is recessive. What is the probable phenotypic ratio for a cross between a man with wavy hair and a woman with curly hair? A. All wavy hair B. 3/4 wavy hair; 1/4 straight hair C. 1/2 wavy hair; 1/2 curly hair D. All curly hair E. 1/4 curly hair; 1/2 wavy hair; 1/4 straight hair
The atomic number is determined by the number of ____.?
a. protons b. neutrons c. electrons d. protons plus neutrons e. protons plus electrons