The migration of breeding individuals between populations causes a corresponding movement of alleles, which is
referred to as:
a. mutation.
b. gene flow.
c. genetic drift.
d. natural selection.
e. directional selection.
b
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What is the first thing that happens after neurotransmitter molecules bind to receptors located on a neuron’s dendrites?
a. The plasma membrane is depolarized, resulting in a decrease in the voltage across the neuron membrane. b. Sodium ions enter the neuron. c. An electrical signal is received by the dendrite, and it then travels passively to the neuron body. d. The neurotransmitter opens ion channels in the dendrite’s plasma membrane.
Gastrulation produces
a. hollow balls of cells. b. embryos with primary tissue layers. c. solid balls of cells. d. maternal messages. e. all of these
A circulatory system that allows some mixing of
oxygenated and oxygen-poor blood is indicated by a. A. b. B. c. C. d. A and B. e. all of these.
The ozone layer can be destroyed by pollutants such as
A) sulfur dioxide. B) CFCs. C) carbon monoxide. D) hydrocarbons and nitrogen oxides. E) carbon dioxide and oxygen.