Stomata open when ________
a. solute concentration inside guard cells is low
b. guard cells swell
c. water is scarce
d. guard cells shrink
b
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The 5' and 3' designations used in reference to DNA and RNA sequences are assigned to the
A. oxygen atoms contained in the deoxyribose and ribose. B. hydrogen atoms that form hydrogen bonds between the nucleotides. C. nitrogen atoms in the nitrogen bases. D. carbon atoms in the nitrogen base purines and pyrimidines. E. carbon atoms of deoxyribose and ribose.
STR alleles differ by the number of copies of a set of nucleotides, such as AGA
a. True b. False
Answer the following questions about DNA replication
A. On a DNA strand that is being synthesized, which end is growing—the 3? end, the 5? end, or both ends? Explain your answer. B. On a DNA strand that is being used as a template, where is the copying occurring relative to the replication origin—3? of the origin, 5?, or both?
Which of the following phenomena will be observed if a cell's membrane is pierced?
(a) the membrane reseals (b) the membrane collapses (c) a tear is formed (d) the membrane expands