The settling-point model predicts that when there is an enduring change in one of the parameters that affect body weight, body weight will:
(a) drift to a new settling point
(b) change precipitously
(c) disrupt homeostasis
(d) find a new set point
(a) drift to a new settling point
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A student uses restriction enzymes to cut a DNA molecule into fragments. The digested DNA is loaded into the wells of an agarose gel and the gel is subjected to an electric current. Upon completion of the run, the gel is stained. Which of the following is true of the dye used to stain the fragments?
(A) It increases the contrast between the agar and the DNA fragments. (B) It must be accounted for when calculating the molecular weight of the fragments. (C) Its charged areas interfere with the migration of the DNA. (D) It is bonded only to the sticky ends of the fragments and can directly determine the sequence of the DNA fragments. (E) It gives a three-dimensional view of the structure of the DNA fragments.
The first serious attack on the idea of spontaneous generation was made by:
A. Francesco Redi B. John Needham C. Lazzaro Spallanzani D. Louis Pasteur
What happens in chimps and humans when the snout is shortened considerably?
A. The sense of smell is dramatically reduced. B. Canine teeth are lost. C. Vocalization becomes possible. D. The eyes move to the front and allow for stereoscopic vision. E. This allows for the development of a chin.
An earthquake decimates a ground-squirrel population, killing 98% of the squirrels. The surviving population happens to have broader stripes, on average, than the initial population. If broadness of stripes is genetically determined,
what effect has the ground-squirrel population experienced during the earthquake? A) directional selection B) disruptive selection C) a founder event D) a genetic bottleneck E) gene flow