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

Biology & Microbiology

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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

Biology & Microbiology

A chain of rod-shaped cells would be called a ________.

A. staphylococcus B. Staphylobacillus C. streptobacillus D. palisade E. streptococcus

Biology & Microbiology

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.

Biology & Microbiology

Oceans, the atmosphere, and fossil fuels are large reservoirs of

A) water. B) phosphorus. C) oxygen. D) carbon. E) nitrogen.

Biology & Microbiology