Use a specific example to explain how a negative feedback mechanism may be used to regulate the
function of endocrine glands. What will be an ideal response?
The action of the parathyroid glands is an example of negative feedback in the endocrine system. The
parathyroid regulates the calcium concentration of the blood. When serum calcium levels drop below
the normal range the parathyroid glands are signaled to produce parathyroid hormone which increases
serum calcium levels. When those calcium levels are above normal, the parathyroid glands decrease
production of parathyroid hormone.
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Detecting a specific protein with an antibody is considered a(n) ________ method
A) selection B) screening C) isolation D) duplication
Which statement about rods and cones in the eye is correct?
a. Cones respond to particular wavelengths (colors) of light, while rods perceive light at low intensity without color perception. b. Rods respond to particular wavelengths (colors) of light, while cones perceive light at low intensities without color perception. c. Cones are more sensitive to single photons of light than rods. d. Nocturnal animals have a high concentration of cones and relatively few rods. e. Humans have approximately equal numbers of rods and cones, but the cones are primarily localized in the fovea.
According to the Endangered Species Act, what is required when a species is identified as at- risk?
a. Land must be purchased by the government to protect the species. b. A biodiversity hotspot must be designated to protect the species. c. The designated habitat must be removed from the private sector. d. A management plan to protect the species must be created.
Oligotrophic lakes are characterized by
A) low oxygen concentrations. B) dense "blooms" of algae. C) low nutrient levels, and clear water with deep penetration of light. D) high nutrient levels, murky water, and shallow penetration of light. E) the largest number and diversity of organisms.