Why do mammals adapted to dry climates tend to have considerably more long-looped nephrons than those adapted to wet climates?
A) So that their blood pressure does not drop to dangerously low levels during periods of drought
B) So that a lower concentration of salt can be produced in the interstitial fluid of the kidney medulla, causing less water to be reabsorbed into the capillaries
C) So that the wastes can be excreted as uric acid instead of urine
D) So that the excess urea they produce as a result of dehydration can be properly filtered by the nephrons and excreted
E) So that a higher concentration of salt can be produced in the interstitial fluid of the kidney medulla, causing more water to be reabsorbed into the capillaries
E
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Egg activation by sperm entry is associated with a sudden increase in protein synthesis. What must be true of these proteins?
A. They are histone proteins. B. They are small peptides. C. They are from maternal mRNAs. D. They are from paternal mRNAs.
The primary thermostat of the body is located in the
a. heart. b. hypothalamus. c. medulla oblongata. d. cerebellum. e. thyroid gland.
Both parents are heterozygous for Tay-Sachs disease (an autosomal recessive disorder). Three children in a row were born with Tay-Sachs disease. What is the chance that a fourth child will have Tay-Sachs disease?
a. 25% b. 50% c. 75% d. 100%
You have been studying the relationship between jackals and tigers in India. Until recently, the only relationship you have observed is that jackals will associate themselves with a particular tiger and follow it at a safe distance in order to feed on the big cat's kills. However, recently you observed a jackal alerting a tiger to a kill with a loud cry. If you continue to observe this alerting behavior, you might change the categorization of the jackal/tiger relationship from ________ to ________.
A. mutualism; parasitism B. mutualism; commensalism C. parasitism; mutualism D. commensalism; mutualism E. competition; predation