Transport of a molecule across a cell membrane by facilitated diffusion ____
a. does not exhibit specificity for a particular type of molecule
b. requires the input of energy
c. depends on a concentration gradient
d. goes against the concentration gradient
e. allows non-polar uncharged molecules to diffuse across a membrane
C
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It is summer, and you are excited about going to your local amusement park, and specifically about riding the new roller coaster that was just built. You imagine waiting at the top of the stairs for the roller coaster to pull into the station, climbing into the car, strapping yourself into the seatbelt, and pulling down the harness. You can imagine the cars slowly chugging up to the top of the first hill, coming down on the other side, and the excitement you expect to feel as you go along for the ride. Of all of the things that you have imagined, which is an example of potential energy?
A. Waiting at the top of the stairs for the roller coaster to pull into the station B. Climbing into the car C. Pulling down the harness D. The roller coaster car going up the first hill
The presence of an antibiotic in the media where the bacteria are grown enables the selection of colonies grown from
(a) transformed cells. (b) nontransformed cells. (c) cells that have the gene for resistance to the antibiotic. (d) both a and c.
Mendel’s principle of independent assortment is directly related to an event that occurs in _____ of
meiosis. A. prophase I B. metaphase I C. anaphase I D. prophase II E. metaphase II
An adaptation that is closely associated with hominin evolution is
A) hair. B) lungs. C) grasping hands. D) omnivory. E) a backbone.