Rods differ from cones in that
A. cones are more sensitive.
B. rods respond to a broad spectrum of light wavelengths.
C. cones are widely dispersed in the retina.
D. rods are concentrated in the fovea centralis.
B. rods respond to a broad spectrum of light wavelengths.
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Some diseases can result from defective transport across the membrane. For example, cystic fibrosis results from a chloride ion transporter that does not function. Which of the following would be affected when this transporter does not function?
A. the chloride concentration gradient B. the electrical gradient of the cell C. Both a and b D. Neither a nor b
Chitin-reinforced bristles that protrude outward from the body wall and are used by most segmented
worms to anchor themselves against a substrate are called
a. metanephridia. b. parapodia. c. septa. d. clitella. e. setae.
Land plants take up phosphates from ____
a. rainfall b. seawater c. soil water d. the atmosphere e. animal waste
Which of the insects in Figure 31-7 is a flea?
A. 1
B. 2
C. 3
D. 5
E. 6