When guard cells are filled with water, ____
a. stomata are open
b. stomata are closed
c. sugars diffuse into the sieve tube members
d. gases cannot diffuse into the plant
e. gases cannot diffuse out of the plant
ANSWER: a
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In addition to the clonal deletion of self-reactive T cells that occurs during embryonic development, autoreactivity of T cells and B cells is also inhibited by T ________ cells.
What will be an ideal response?
In emperor penguins, the mother incubates the egg during the Antarctic winter while the father roams in search of food
Indicate whether the statement is true or false
In a typical adult human about 180 L of fluid leaves the blood as filtrate each day, and ____ is
reabsorbed.
a. ~50 percent b. ~65 percent c. ~80 percent d. ~90 percent e. over 99 percent
Frogs have which of the following traits?
A. endothermic B. incomplete digestive tract C. jawless D. cartilaginous skeleton E. larval respiration with gills, but adult respiration with lungs