The reason that many plasmids used in laboratories for transformation experiments contain an ampicillin resistance gene (ampR) is
A) so that the plasmid can replicate in bacterial cells.
B) so that the plasmid can recombine with the bacterial genome.
C) to enable the recipient cell to conjugate.
D) to provide a selectable marker.
E) to map point mutations.
D
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What type of estuary is created by glacial retreats?
a. A bar-built estuary b. A drowned river valley estuary c. A tectonic estuary d. A fjord
What is the trade-off in nutrient availability concerning clay soils?
A) high in anion concentration, but clay soils do not hold water well so anions leach away B) Cations are less likely to leach out of soil but are difficult for plants to extract. C) high in both anions and cations, but low pH makes root uptake of ions difficult D) Anions are less likely to leach out of the soil but difficult for plants to extract.
What pattern of inheritance "breaks the law" of independent assortment?
What will be an ideal response?
What mechanisms do plants use to discourage predation?
What will be an ideal response?