A population of snakes lives in a valley. This population of snakes is 30% black and 70% brown in coloration. A dam is built to flood part of the valley, separating the snakes into two populations
West of the human-made lake, there's a very small population of all black snakes, while east of the lake, the population is much larger and retains the same percentage of black and brown coloration as before the dam was built. What process applies to this example? A) a homozygous population growth
B) genetic drift
C) inbreeding
D) competitive exclusion
B
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A cell in G0 state ____
a. is actively growing before cell division begins b. has a cleavage furrow and the cytoplasm is beginning to divide c. is actively replicating chromosomes d. is in cytokinesis e. has entered a resting stage and is not actively dividing
The movement of molecules across a membrane from an area of lower concentration to an area of higher concentration with the expenditure of energy is called
A. active transport. B. passive diffusion. C. osmosis. D. facilitated diffusion.
Because enzymes affect the speed of chemical reactions without being consumed, they are referred toas:a
hydrogen acceptors. b. activation energy. c. catalysts. d. cytochromes. e. transformation proteins.
What is the origin of H5N1 virus?
A. Birds B. Dogs C. Pigs D. Humans E. Cats