In the previous unit, you learned about organ systems. Name three organ systems in humans that are affected by the endocrine system. For each organ system named, identify a hormone that influences that system. For each hormone named, describe how the hormone works to alter the organ system.
What will be an ideal response?
Ans: Three organ systems that are affected by the endocrine system are the urinary system, the reproductive system, and the circulatory system.
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_____ mutations are important to the evolutionary process; most cancers result from _____ mutations
A. Somatic; germ-line B. Germ-line; somatic C. Germ-line; heritable D. Somatic; heritable E. Point; germ-line
In alcoholic fermentation, _____ is the final acceptor of electrons
a. oxygen c. acetaldehyde b. pyruvate d. sulfate
Allen's rule states that mammals from colder climates have shorter ears and appendages than individuals of the same species from warmer areas. The related Bergman's rule states that mammal body size varies with latitude, with larger body size in populations located closer to the poles and smaller body size in populations located closer to the equator. What can explain both of these rules?
A. Larger bodies can store proportionally more fat as insulation than smaller bodies. B. Smaller bodies can store proportionally more fat as insulation than larger bodies. C. Heat loss increases as the surface area to volume ratio of the animal increases. D. Larger bodies have a proportionally larger surface area, and heat radiation varies with volume. E. Smaller bodies have a proportionally smaller surface area, and heat radiation increases with surface area.
Unlike DNA, which typically forms a helical structure, different molecules of RNA can fold into a variety of three-dimensional shapes. This is largely because ___________________
(a) RNA contains uracil and uses ribose as the sugar. (b) RNA bases cannot form hydrogen bonds with each other. (c) RNA nucleotides use a different chemical linkage between nucleotides compared to DNA. (d) RNA is single-stranded.