A neuron and a nerve differ in that 

A. nerves are bundles of fibers and neurons are single cells.
B. neurons carry impulses and nerves do not.
C. neurons are found in the peripheral nervous system only.
D. nerves are attached to neurons.


A. nerves are bundles of fibers and neurons are single cells.

Biology & Microbiology

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Lamarck’s contribution to the theory of evolution is the concept of

a. natural selection. b. catastrophism. c. inheritance of acquired characteristics. d. mutation. e. geographic distribution of organisms.

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In the surface waters of oceans, the two most limiting nutrients for primary productivity are

A) sulfur and phosphorus. B) sulfur and nitrogen. C) nitrogen and iron. D) nitrogen and phosphorus.

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A strain of a cereal grain can be either dark tan, medium-dark tan, medium tan, light tan, or cream colored. When a dark tan and a cream plant are crossed, all F1 are medium tan

The F2 are distributed in a ratio of 1:4:6:4:1 from darkest to lightest. How many additive alleles are needed to produce the darkest phenotypes?

Biology & Microbiology

One difference between eukaryotic and prokaryotic cells is that eukaryotic cells ________ prokaryotic cells

A) have DNA, which is lacking in B) have membrane-enclosed structures called organelles, which are lacking in C) have a plasma membrane, which is lacking in D) have a nucleoid region, which is lacking in

Biology & Microbiology