Apoptosis is a form of
A) programmed cell death that is a normal part of development.
B) programmed cell division that is a normal part of development.
C) cellular duplication.
D) cellular adhesion.
A) programmed cell death that is a normal part of development.
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Two tubes are inoculated from one test tube of a bacterial culture. The cultures are then transferred every day for 2 months. All of the media and growth conditions are the same in every tube
After 2 months of cultivation, the fitness and genotype frequencies of the populations in the two tubes are compared. The fitness of the two cultures is the same, but the genotype frequencies are very different in the two cultures. How is this possible? A) Two months is not long enough for different fitness levels to evolve even if the genotype frequencies change. B) This result is not possible because different genotype frequencies would result in different fitness levels under the same growth conditions. C) Natural selection caused the evolution of different genotype frequencies within the separate test tubes. D) Genetic drift within the small populations in the test tubes resulted in different genotype frequencies.
If you found a mutation, involving the loss of two bases, which was present in humans living on all four continents which you could test but was absent in close relatives such as gorillas and chimps, what would this imply?
A. Two bases were actually insertions in the nonhuman primates. B. Deletion arose before the branch between humans and nonhuman primates. C. Deletion arose in multiple nonhuman primates. D. Deletion arose at least six times in different human populations. E. Deletion arose after the branch between humans and nonhuman primates.
A(n) ____ allows two rival males to assess one another’s strengths without engaging in a potentially damaging fight
a. conditioned stimuli b. eusocial response c. instinctive behavior d. kinetic movement e. threat display
One function of the type of tissue represented in the accompanying figure is:
a. insulation. b. flexible support. c. calcium reservoir. d. oxygen transport. e. secretion and absorption.