Mitochondria, lysosomes, and ribosomes are examples of ____
a. organs
b. cells
c. systems
d. organelles
d
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Extra bones that develop between the usual bones of the skull are called
A) flat bones. B) sesamoid bones. C) sutural bones. D) endochondral bones. E) None of the answers are correct.
Stratified epithelium consists of
A. a multiple layer of cells that appears to change shape when the tissue is stretched. B. multiple layers of cells. C. a single layer of cells. D. a single layer of cells that changes shape when the tissue is stretched. E. None of the choices are correct.
The repolarization phase of the action potential occurs because
A) voltage-gated Na+ ion channels open. B) voltage-gated K+ ion channels open. C) voltage-gated Na+ ion channels close. D) voltage-gated K+ ion channels close. E) both B and C
If the field diameter of the high-powered objective is 0.5 mm, what is the field diameter of this objective in µm?
A) 500 ?m B) 0.005 ?m C) 50 ?m D) 0.05 ?m