The pH of stomach acids is usually ____or lower
a. 2
b. 4
c. 7
d. 10
e. 12
ANSWER: a
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The evolution of conducting tubes (sieve tubes) in land plants and brown algae is an example of
A. homoplasy caused by convergence. B. homoplasy caused by common descent. C. homoplasy caused by evolutionary reversal. D. homology caused by convergence. E. homology caused by common descent.
If light were prevented from reaching the right side of both retinas, what would occur?
a. The right half of the visual field would be lost. b. Only the right cerebral hemisphere would be stimulated by the light. c. No information about the light would be carried in the left optic nerve. d. The left half of the visual field would be lost. e. Sight would be lost.
The nephron begins in the ____
a. glomerulus b. loop of Henle c. cortex d. ureter e. medulla
If the neuron is stimulated such that its membrane potential changes to 50 mV, what is the sign of the driving force for Cl- ions and in which direction will these ions move across the membrane?
a. Positive driving force; Cl- moves into the cell b. Positive driving force; Cl- moves out of the cell c. Negative driving force; Cl- moves into the cell d. Negative driving force; Cl- moves out of the cell.