Most atmospheric carbon dissolved in the ocean is in the form of ____
a. carbon dioxide
b. carbon monoxide
c. hydrocarbons
d. bicarbonate and carbonate
e. carbon gas
ANSWER: d
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Which situation(s) might warrant the removal of a histidine tag when purifying a recombinant protein?
A. Histidine residues inhibit protein folding, thereby decreasing the functionality of the protein. B. The expression vector used for inserting the gene of interest already contains histidine-encoding sequences. C. Histidine residues bind preferentially to nickel resins on the column during purification, and are not washed away. D. All of the choices are correct.
The primate-like mammals first arose about how
many million years ago? a. 95 b. 65 c. 45 d. 25 e. 15
Which of the following is NOT an endocrine gland?
A) pituitary B) thyroid C) adenoid D) adrenal
Two users of an internet gardening site are arguing. Sarah, an organic gardener from Maine, refers to her snapdragon plants as "annuals." Marco, a farmer from Italy, scoffs and declares them "perennials." Who is right?
A. They are both right. In a Mediterranean climate, the snapdragon re-emerges from its rootstock each spring. In colder climes, it must be replanted each year. A plant that is perennial in its native habitat may be an annual in other climates. B. Sarah is right. A snapdragon plant only returns for 3-4 years, and thus is not a true perennial. C. Marco is right. With enough inorganic fertilizer, the snapdragon can regrow. All "annuals" are just undernourished perennials. D. They are victims of bad translation software. The plant Marco refers to reseeds itself year after year and thus is a perennial.