Briefly discuss the structure and function and cardiac muscle. What will be an ideal response?
The fibers of cardiac muscle join end to end, and they branch and rejoin to form complex networks. One or two nuclei lie within each fiber. A characteristic feature of cardiac muscle
tissue is the presence of intercalated discs, specialized junctions where the fibers join. When
cardiac muscle contracts, the heart pumps the blood.
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Ribosomes are the structures in the cell that produce
A. steroids. B. lipids. C. glucose. D. starches. E. proteins.
All of the following are true about salmon smolt EXCEPT:
a. They have a larger surface-to-volume ratio compared to adults. b. They develop adaptations for living in salt water. c. This is the period when they reach sexual maturity. d. They are migrating to the ocean
Even though the autumn may be unusually warm, the
leaves from deciduous trees begin to drop during September. Which of the following is the best explanation? a. The trees are responding to shorter days. b. The autumn months are usually drier because the summer rains have tapered off. c. The effects of phototropism are operating “right on schedule.” d. There is not enough sunlight to carry on photosynthesis any longer. e. None of these are the best explanation.
In the following figure, at what stage does natural selection act to generate novel phe-notypes?
a. panel A b. panel B c. panel C d. panels B and C e. None of the stages