Down syndrome involves trisomy
a. 3.
b. 5.
c. 15.
d. 19.
e. 21.
Answer: e
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A simplified form of the Fick diffusion equation is J = KA (C1-C2) where J is the rate of diffusion, K is a constant, A is the area across which diffusion is occurring, and C1 and C2 are the concentrations of the substance on either side of the membrane. Given this, which of the following would INCREASE the rate of diffusion of a solute?
A. An increase in C1 while holding C2 constant B. An equivalent decrease in both C1 and C2 C. An equivalent increase in both C1 and C2 D. A decrease in D E. A decrease in A
In an allergic reaction, histamine is released from _______ cells found in peripheral tissues.
Fill in the blank(s) with the appropriate word(s).
Nonpolar compounds are defined as ________ because they do not form bonds with water.
Fill in the blank(s) with the appropriate word(s).
You need to identify a plant, but it is winter and the leaves have fallen to the ground and mixed with leaves from other plants. The parts of flowers, fruits, and seed leaves of germinating seeds are not available either. Your best clue to identify the plants as a monocot or a eudicot is to
A. determine if the roots lack phloem and xylem to identify it as a monocot. B. inspect the stem for woody bark, as only eudicots have woody tissue. C. cut the stem and if the vascular bundles are scattered in the stem, it is a monocot. D. determine if there are parallel xylem tubes in the stem to identify it as a monocot. E. cut the stem and if the vascular bundles are in a distinct ring, it is a monocot.