All skeletal muscle fibers are _____
A) smooth and under involuntary control
B) smooth and operate independently of other skeletal muscle fibers
C) striated and under voluntary control
D) smooth and under voluntary control
E) striated and electrically coupled to neighboring fibers
Answer: C
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How might a pathogenic bacterium be affected by antibodies?
a. The antibodies may stick to multiple bacteria, causing agglutination. b. The antibodies may coat the surface of the bacteria (opsonization), allowing for it to be tagged for phagocytosis. c. The antibodies may block proteins necessary for binding the pathogen to the host. d. The antibodies may block proteins necessary for binding the pathogen to the host, may opsonize the bacterium, or may agglutinate bacteria.
Most of the best agricultural soils in the United States are found in areas that were formerly
A) temperate grasslands. B) taiga forest. C) tropical rain forest. D) tundra.
Match the nutritional category of microbe to its source of carbon and its energy source. Chemoautotroph
A) Carbon dioxide and simple inorganic chemicals B) Organic carbon and metabolic conversion of the nutrients from other organisms C) Organic carbon and sunlight D) Carbon dioxide and sunlight
Which statement is accurate if the first true cell arose by the RNA-first hypothesis?
A. Proteins in the protocell would have evolved the ability to synthesize DNA. B. The first cell had RNA genes that could have specified protein synthesis. C. RNA genes replicated because of the presence of proteins. D. All of these statements support the RNA-first hypothesis. E. None of these statements support the RNA-first hypothesis.