Atoms with eight electrons in their outer shells tend to:
A) form covalent bonds. B) be stable and unreactive.
C) be chemically reactive. D) form ionic bonds.
Answer: B
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Statements 63–67 ask about membrane permeability. For each
one, select the best choice from the following five processes below. a. simple diffusion b. facilitated diffusion c. osmosis d. active transport e. endocytosis E 63. This process is used by white blood cells to ingest bacteria. E 64. This process specifically moves water molecules across a differentially permeable membrane. E 65. This process explains the movement of any kind of molecule from areas of higher concentration to areas of lower concentration. E 66. The method by which glucose crosses the plasma membrane. M 67. This process explains the movement of molecules against a concentration gradient.
Each of the following statements about carbon is TRUE EXCEPT which one?
A) All organic molecules contain carbon. B) Carbon atoms form four covalent bonds. C) Carbon atoms form diverse molecules that may be linear, branched, or circular. D) Carbon can form strong hydrogen bonds with other elements. E) Carbon can form bonds with hydrogen, oxygen, nitrogen, as well as another carbon atom.
Which is true of selective IgA deficiency?
A. It is invariably fatal. B. It is very rare. C. It mainly occurs in older adults. D. Patients may develop an anti-IgA antibody.
Silvadene, a topical treatment for burns, contains 1% silver. What category of chemical control agent is in Silvadene?
A. halogens B. heavy metals C. oxidizing agents D. aldehydes E. surfactants