Which of the following statements is not a tenet of modern cell theory?
A) All organisms are composed of cells and cell products.
B) An organism's structure and all of its functions are ultimately due to the activities of its cells.
C) All cells occupy space.
D) The cell is the basic structural and functional unit of life.
E) All cells come only from preexisting cells.
C
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What kind of muscles are respiratory muscles?
a. skeletal b. smooth c. cardiac d. efferent e. afferent
What causes a graded potential to degrade?
What will be an ideal response?
The neurotransmitter most likely produced when a person uses a drug that creates a sense
of well-being is A) dopamine. B) substance Q. C) enkephalin. D) glutamic acid.
In the spinal cord, nerve tracts or funiculi make up the:
A) white columns. B) gray horns. C) central canal. D) gray commissure.