Which structure is the growing tip of a plant stem?
A) apical meristem
B) axillary bud
C) rhizome
D) internode
A
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Which one of the following is not a way in which RNA differs from DNA?
A. RNA has uracil as one of its bases; DNA has thymine. B. RNAs are typically single-stranded; DNA is double-stranded. C. RNA nucleotides can possess only a single phosphate group; DNA nucleotides have one, two, or three phosphate groups. D. RNA molecules are usually much shorter than DNA molecules. E. The sugar component of RNA nucleotides is ribose; the sugar component of DNA nucleotides is deoxyribose.
Eutrophication is the addition of ________ to an aquatic ecosystem. a. nutrients b. producers c. water d. None of these choices
e. oxygen
Long-term exposure to cold can alter metabolism and encourage __________ in which brown adipose
tissue produces heat. Fill in the blank(s) with the appropriate word(s).
What would happen to people exposed to a chemical warfare agent that blocked acetylcholine from binding to muscle receptors?
A) Action potentials would be continuously generated, causing convulsive muscle contractions. B) Muscle contractions would be prevented, causing paralysis. C) Muscle contractions could still occur, but relaxation of the muscle would be impaired. D) Action potentials would be continuously generated, causing convulsive muscle contractions; muscle contractions would then be prevented, causing paralysis.