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Figure 35.17
The structure indicated by the letter "B" above represents _____.
A. actin
B. a myofibril
C. myosin
D. the sarcoplasmic reticulum
E. a muscle fiber
Answer: D
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Agar is a substance used as a culture medium in the laboratory. It is extracted from the cell walls of
____ algae.
a. green b. golden c. blue-green d. brown e. red
What happens to air as it is warmed?
a. It rises. b. It sinks. c. It moves at a slower speed. d. It moves horizontally. e. It does none of these
Which statement best describes the activity of the sodium-potassium pump?
a. It transports hydrogen ions out of the cell. b. It transports water directly out of the cell. c. It transports 2 sodium ions into the cell in exchange for 3 potassium ions. d. It transports 3 sodium ions out of the cell in exchange for 2 potassium ions. e. It transports 2 sodium ions out of the cell in exchange for 2 potassium ions.
The chief function of root hairs is to
A) decrease the anchoring power of roots. B) increase the surface area for efficient absorption of water and minerals. C) provide a direct passageway from the soil to the vascular cylinder.