Which of the following is a false statement about plant secondary metabolites?
A. Some can be used to treat human diseases.
B. Some can be poisonous to humans.
C. The activity of certain medicines is due to secondary metabolites.
D. Some of them can cross the placenta during pregnancy.
E. They are too unpredictable to use in pharmaceutical research.
E. They are too unpredictable to use in pharmaceutical research.
Many secondary metabolites are used in the pharmaceutical industry.
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A previously unknown animal is being studied so that it can be classified. It is an invertebrate, triploblastic, dorsoventrally flattened, acoelomate, and has flame cells. Which phylum would you place it in?
A. Platyhelminthes. B. Mollusca. C. Arthropoda. D. Cnidaria.
A 50-year-old woman visits her doctor with complaints of bruises that will not heal. Her doctor has had her on long-term antibiotic treatment to control some chronic infections
Which of the following explains how her antibiotic treatment is related to her bruising? A) The antibiotics weaken the cells lining her capillaries, causing them to leak blood into the surrounding tissues. B) The antibiotics have traveled to her liver and are now preventing the liver from producing proteins that circulate in the blood and help with clotting. C) The antibiotics have destroyed the "good" bacteria in her large intestine that produce vitamin K, which is important for proper blood clotting. D) She is malnourished because the antibiotics have destroyed the "good" bacteria in her digestive system that are responsible for producing the digestive enzymes that she needs to break down her food.
A woman struggling with a bacterial illness is prescribed a month's supply of a potent antibiotic. She takes the antibiotic for about two weeks and feels much better. Should she save the remaining two-week supply, or should she continue taking the drug?
A) She should save the drug for later, because if she keeps taking it the bacteria will evolve resistance. B) She should save the drug for use the next time the illness strikes. C) She should save the drug because antibiotics are in short supply, and she may need it to defend herself against a bioterrorism incident. D) She should continue taking the drug until her immune system can completely eliminate the infection. Otherwise, some bacteria may remain in her system, and they will probably be resistant.
The enteric division of the autonomic nervous system consists of neurons in the digestive tract, the gallbladder, and the
A) heart. B) lymphatic system. C) pancreas. D) thyroid gland.