How do lampreys differ from other vertebrates?
What will be an ideal response?
They lack jaws and paired appendages. The notochord persists in the adult.
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Which of the following best explains why "carbs" (carbohydrates) are advertised by manufacturers of candy bars and sports drinks as a "quick energy boost"?
A) The energy in them can be stored as fat, which has high energy per unit weight. B) The carbons in carbohydrates are rich in energy because they are highly oxidized. C) Carbohydrates are reduced molecules that have high-energy electrons. D) This is an advertising gimmick that has no scientific evidence to support it.
Bioluminescence of deep-sea animals may be used for all of the following except:
a. attraction of prey. b. detection and identification of mates. c. countershading. d. photosynthesis. e. startling a predator.
You are studying a trafficking protein important for secretion in helper T cells. What is the likely outcome of a defect in this protein?
A. impaired secretion of immunoglobulins B. impaired secretion of degraded antigens C. impaired secretion of membrane attack complex D. impaired secretion of cytokines
Hematocrit is the percentage of red blood cells in the blood. In adult humans, hematocrit is roughly 40-45%, but it can be much higher or lower in other animals. Consider the Weddell seal, a mammal that can dive and hold its breath underwater for upwards
of 80 minutes. What is the hematocrit level of a Weddell seal, and why? A) It is likely lower than that of an adult human because the seal needs access to less oxygen when diving. B) It is likely lower than that of an adult human because the seal needs access to more oxygen when diving. C) It is likely higher than that of an adult human because the seal needs access to less oxygen when diving. D) It is likely higher than that of an adult human because the seal needs access to more oxygen when diving.