In a resting neuron, which ion is slowly leaking into the cell?
a. potassium only
b. sodium only
c. chloride only
d. calcium only
e. both sodium and potassium
ANSWER: b
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Which one of the following explains what xylem loading is?
A. when the xylem is filled with sugars B. right after the xylem is filled with minerals C. when the xylem is filled with water D. xylem loading never occurs E. phloem has given up its water to the xylem
Which of the following is NOT an example of kinetic energy?
A. heat B. light C. sound D. the energy in chemical bonds E. random molecular movement
Mutation and migration introduce new alleles into populations. What is the most likely principal force that will shift allelic frequencies within large populations?
What will be an ideal response?
The first material to enter the Krebs cycle is
A. oxygen. B. glucose. C. acetyl-CoA. D. citric acid.