Which microscope is the most widely used to show stained cells against a bright background?
A. electron
B. dark-field
C. fluorescence
D. bright-field
E. phase-contrast
Answer: D
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To which subtype of muscle tissue does a fiber with cross-striations and many peripherally located nuclei belong?
(a) skeletal. (b) cardiac. (c) smooth. (d) none of the above.
________ is the inner most germ cell layer that forms during gastrulation.
A. Ectoderm B. Mesoderm C. Endoderm D. Mesentery E. Epidermis
Proteoglycans are _____
A. both composed of collagen and provide resistance to compression. B. both composed of polysaccharides called glycosaminoglycans and provide resistance to compression. C. composed of polysaccharides called glycosaminoglycans. D. composed of collagen. E. resistant to compression.
In many ways, a mule is a superior animal to the horse or donkey. Mules are often stronger and can jump higher than either of their parents. Why, then, are mules considered to be a "weak hybrid"?
A. Their offspring are progressively weaker than the parents. B. They are more prone to disease than are horses and donkeys. C. They do not live as long as horses and donkeys. D. They are sterile.