Explain how the number of valence electrons is related to the chemical properties of an atom. Use two
specific examples in your explanation. What will be an ideal response?
Atoms having filled valence shells (e.g., helium and neon) are stable and unreactive; atoms having
unfilled valence shells (e.g., chlorine and sodium) are unstable and reactive.
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All of the petals of a flower are collectively called the
(a) corolla. (b) stamens. (c) receptacles. (d) calyx.
What happens if a growing shoot's tip breaks off?
a. Auxin levels rise. b. Cytokinin levels drop. c. Cytokinin levels rise and stimulate lateral bud growth. d. Auxin levels remain constant but efflux carrier distribution changes. e. Cytokinin stimulates a new apical meristem.
The enzyme dicer chops dsRNA molecules into small pieces of
A. mRNA and miRNA. B. siRNA and rRNA. C. miRNA and siRNA. D. mRNA and siRNA.
Drug resistance has occurred because:
a. patients do not complete the course of therapy as prescribed b. patients share their medications with others c. patients are prescribed the same antimicrobials repeatedly d. patients are prescribed antimicrobials inappropriately e. all of the above