What is the water potential of phloem relative to the water potential of the surrounding xylem?
a. lower
b. higher
c. about the same
d. exactly the same
Ans: a. lower
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The selective permeability of a membrane refers to the ____
a. movement of a molecule from an area of high concentration to an area of low concentration b. ability of a substance to pass through any membrane c. ability of only certain molecules to pass across a membrane d. need for carrier proteins to transport some molecules across a membrane e. ability of molecules to be transported across a membrane
What causes the hypocotyl of dicots to straighten?
a. light b. gravity c. wind d. wind e. soil
A single atom of carbon may form up to
__________ covalent bonds with other atoms. a. 2 b. 3 c. 4 d. 5 e. 6
Carbon is fixed in which part of the diagram in Figure 9-3?
a. A
b. G
c. 4
d. 2
e. 1