Restriction enzymes are useful in creating recombinant DNA molecules because they
A) generate "sticky ends" by cutting at the same sequence in any DNA source.
B) are found only in human cells, where they naturally mend broken DNA strands.
C) are used to encapsulate and transport foreign DNA into cells of the target organism.
D) stimulate DNA amplification so that the desired cells or their products can be scaled up.
A) generate "sticky ends" by cutting at the same sequence in any DNA source.
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In higher eukaryotes, kinetochores attach to
A) one spindle fiber. B) one spindle fiber on each side. C) multiple spindle fibers. D) multiple repeating structural subunits.
In the human digestive system, ________ is the rhythmic smooth muscle contractions that aid in moving food along the system.
A. countercurrent exchange B. phagocytosis C. peristalsis D. rumination E. sphincter contractions
Which of the following cells would most likely hav the greatest concentration of densely packed rough endoplasmic reticulum?
A. An amoeba engulfing small ciliates B. A bioluminescent bacterial cell C. A pancreatic cell engaged in the production of digestive enzymes D. A functional phloem cell at maturity E. An epithelial cell whose DNA is replicating before mitosis
A more or less circular ring of mushrooms appears in your yard, apparently overnight. The circle is several yards in diameter. The most likely explanation for this circle of mushrooms is that:
A) the mushrooms are all part of the same organism, with mycelia radiating out from the location of a germinated spore. B) a circle is nature's most perfect shape for asexual reproduction structures. C) the fungus produces a toxin in the center to prevent too many mushrooms from being produced. D) one mushroom in the circle reproduced sexually to make all the other mushrooms in the circle.