The most accurate description of an organism with
genotype AaBb is
a. homozygous dominant.
b. heterozygous.
c. heterozygous dominant.
d. homozygous recessive.
e. heterozygous recessive.
Answer: b
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Which group of fishes gave rise to the amphibians?
A. Cartilaginous fishes B. Lobe-finned fishes C. Jawless fishes D. Ray-finned fishes
Which of the following is an example of the second law of thermodynamics?
a. Conversion of the energy in sunlight into glucose b. The use of gasoline to propel your car c. ATP activation of a proton pump. d. A light bulb heats up after use e. A nuclear reactor lights up the city.
Which of the following is an example of a female mating with a male only after submitting him to a courtship ritual?
a. A female frigate bird is attracted to the male with the brightest red chest feathers. b. A female black widow will only mate with a male that will mate guard her. c. A female arctic squirrel will mate with the male that controls the best territory. d. A female moth will mate with the same male for 24 hours. e. A female bowerbird will mate with a male only after inspecting the small thatched structure he has built for her.
The vertebrate kidney helps to keep the acidity of body fluids constant by varying the amount of hydrogen ions (H+) it secretes into the urine. You can confidently predict that this aspect of kidney function will be controlled by
A) a positive feedback mechanism. B) a negative feedback mechanism. C) nerve impulses from the brain. D) a hormone produced in the kidney itself.