Solutions to 100 passage-based Biology questions

61 c transport of sweat electrolytes is accomplished

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Unformatted text preview: likely to be homozygous for the deleterious alleles than if out-breeding occurred. 61. C. Transport of sweat electrolytes is accomplished by simple diffusion across a concentration gradient. Blood plasma has higher electrolyte concentrations than sweat glands. Active transport is movement of molecules against a concentration gradient. Osmosis involves movement of water. Page 7 of 12 62. C. Sweating is a response to an increase in body temperature. It is an attempt by the body to decrease its temperature. Drinking ice water would reduce the core temperature, thus decreasing the need to sweat. 63. B. This question requires some knowledge of the fate of embryonic tissue. As the disease is known as ectodermal dysplasia, it is a safe assumption that it affects structures originating from the ectoderm. From the offered options, only teeth are ectodermal structures and therefore the most likely to be affected by the dysplasia. 64. B. The extremities of a human are long and thin, maximizing the surface area to volume ratio of these structures. Since blood vessels loop along the extremity, the counter-current exchange system can be taken advantage of. Sweating on these extremities accelerates the heat loss from these large surface area structures, rapidly decreasing the blood temperature running through them. Answer C is wrong because the entire body is covered in an ectodermal covering called the skin. D is incorrect because the extremities are actually located furthest away from the hypothalamus, and it would actually take longer to receive information from these sources than others in the torso. 65. D. Negative feedback loops involve the product of a reaction inhibiting the reaction itself. It therefore works to decrease the rate of system, preventing a buildup of product. 66. B. Desert-adapted animals rarely, if ever, sweat. Water is the limiting resource in any desert and so all animals have mechanisms to minimize water loss. Desert animals have a litany of other mechanisms to cope with the heat, including being active at n...
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This note was uploaded on 03/23/2011 for the course CHEM 100 taught by Professor Vallis during the Spring '11 term at Dalhousie.

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