Imagine that you have an atom of sodium (Na), which has two electrons in its innermost shell, eight electrons in its middle shell, and one valence electron in its outermost shell. In this atom, which electron would have the greatest amount of potential energy?
a. the valence electron
b. an electron in the middle shell
c. an electron in the innermost shell
d. All of the electrons in this atom would have equal amounts of potential energy.
Ans: a. the valence electron
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Both pulse-field gel electrophoresis and Western blotting utilize electrophoresis in their procedures. When comparing the two procedures, which statement is true?
A. Pulse-field gel electrophoresis is excellent for identifying minute genetic differences among strains of one species of an organism. B. Pulse-field gel electrophoresis separates DNA fragments while Western blotting separates proteins. C. The presence of antibodies in a patient specimen can be identified in the Western Blot. D. Pulse-field gel electrophoresis is used for genetic analysis. E. All of the statements are true.
Which populations are at greatest risk for extinction?
A) very small ones B) very large ones C) ones with specific niches D) ones with extensive habitat ranges
Groups of tissues that function together form a(n)
A) system. B) individual. C) gland. D) organ. E) organ system.
Beta-blockers are a class of drugs that target beta-adrenergic receptors, blocking the action of epinephrine and norepinephrine. These drugs are used to treat heart conditions, hypertension, glaucoma, and migraine headaches and are also used off-label to alleviate stage fright in performers. Since the beta-adrenergic receptor is a GPCR, what intracellular event is prevented by the use of a beta-blocker?
A. Transport of the receptor-hormone complex into the cell and the nucleus, where it would regulate transcription B. A protein kinase cascade, initiated by the receptor's intracellular kinase domain C. A protein phosphatase cascade, initiated by the receptor's intracellular phosphatase domain D. Release of an activated G protein subunit bound to GTP