Which of the following is a true statement?
a. Polar bears are no longer hibernating
b. Polar bear tissues contain high amounts of mercury and organic pesticides.
c. Polar bears are always found within 50 miles of the North Pole.
d. Human beings are the only influence that alters the course of evolution for an organism.
b
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Aldosterone is a hormone secreted by the adrenal cortex, and insulin is a peptide secreted by the pancreas
When aldosterone contacts a target cell, it binds to an intracellular receptor and migrates to the nucleus; insulin binds to extracellular receptors on the plasma membrane. What is the most likely reason for this difference? A. Aldosterone is hydrophilic and therefore must enter the aqueous environment of the cytoplasm to have an effect. B. Aldosterone is lipid-soluble and therefore easily crosses the phospholipid bilayer of the plasma membrane. C. Aldosterone is too small to bind extracellular receptors on the plasma membrane. D. Insulin is too large to interact with DNA.
A sugar or other molecule in which radioisotopes have been substituted for some atoms is a(n)
a. enzyme. b. reactant. c. tracer. d. subatomic particle. e. quark.
Which tissue system of the plant body is largely responsible for photosynthesis?
a. ground tissue system b. vascular tissue system c. dermal tissue system d. primary tissue system e. secondary tissue system
Dr. Kirby has been meeting with 9-year-old Loren, whose family lost everything in a tornado. In her initial visit, Loren was diagnosed with acute stress disorder. During a 2-month follow up with Dr. Kirby, Loren is still exhibiting many of the same symptoms. What should Dr. Kirby do?
a. Dr. Kirby will revise Loren's diagnosis from ASD to posttramatic stress disorder. b. Dr. Kirby will revise Loren's diagnosis from ASD to generalized anxiety disorder. c. Dr. Kirby will continue treatment for acute stress disorder for at least 6 months. d. Dr. Kirby should tell Loren she is cursed so as to speed her recovery.