In California, a species of salamanders were geographically separated over time. The group that lived in southern California relied heavily on large gold blotches on their skin that helped to camouflage them from predators. The group that lived along the coast adopted a color pattern that mimicked a poisonous, colorful newt common to that area. Instead of being camouflaged, these salamanders
advertised their colors. What type of selection process has occurred over time?
A. theoretical selection
B. artificial selection
C. experimental selection
D. natural selection
D
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Acetylcholine released into the junction between a motor neuron and a skeletal muscle binds to a sodium channel and opens it. This is an example of _____
A) a voltage-gated sodium channel B) a voltage-gated potassium channel C) a ligand-gated sodium channel D) a second-messenger-gated sodium channel E) a chemical that inhibits action potentials
Archaeal cell walls
A. are disrupted by treatment with lysozyme or penicillin. B. include orthomureine. C. are similar to those of Gram-negative bacteria. D. lack murein and D-amino acids.
Indicate the ploidy of each of the following cells:A
plant spores B. sperm C. somatic cells D. cells of a flower petal What will be an ideal response?
Eukaryotic cells require oxygen to:
A) start glycolysis. B) perform fermentation. C) serve as an electron acceptor in the electron transport chain. D) breathe. E) enter the Krebs cycle as an intermediate.