Mature plants may become ________ in dry or cold seasons in order to survive long periods that are unfavorable for growth.
A. gravitropic
B. dehydrated
C. dormant
D. thigmonastic
E. photoperiodic
Answer: C
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The five steps listed below are involved in excitation-contraction coupling
1. A wave of depolarization passes through the T-tubules. 2. Ca2+ binds to and causes a conformational change in troponin. 3. Tropomyosin moves to expose myosin-binding sites on the actin. 4. Ca2+ is released from the sarcoplasmic reticulum. 5. Cross-bridges form and produce a contraction. Which of the following lists the steps in the correct order of events? A. 1, 4, 2, 3, 5 B. 4, 5, 2, 1, 3 C. 1, 2, 4, 3, 5 D. 5, 4, 1, 2, 3 E. 2, 1, 3, 5, 4
A chain of rod-shaped cells would be called a ________.
A. staphylococcus B. Staphylobacillus C. streptobacillus D. palisade E. streptococcus
Greater force of contraction comes when
A. more motor units are activated. B. motor units are stimulated for a longer time. C. more ATP is available. D. motor units have few muscle fibers per unit. E. sacromeres are longer.
Oceans, the atmosphere, and fossil fuels are large reservoirs of
A) water. B) phosphorus. C) oxygen. D) carbon. E) nitrogen.