What is NOT a reason why an abscessed wound might not respond to antibiotic treatment?
A. The bacteria within the abscess have ceased replicating, and many antibiotics require actively replicating cells in order to be effective.
B. The blood vessels that would bring the drug to the area have been destroyed or clogged with clots, preventing the drug from getting to the microbes in the abscess.
C. The bacteria in an abscess have all acquired multi-drug antibiotic resistance, so any drugs that are used will have no effect.
D. The chemical composition of the pus in the abscess often inactivates antibiotic drugs, making them ineffective.
C.
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When scientists are attempting to breed for increased ability of a plant to utilize carbon dioxide they must consider improvement of:
A. stomatal openings B. bundle-sheath cells C. mesophyll air spaces D. chlorophyll production E. stress tolerance
In humans, which embryonic tissues are "indifferent"?
A. vertebral columns B. brain stems C. adrenal glands D. spinal cords E. gonads
Which is correct regarding the rate of microbial death?
A. Upon contact with the control agent, all cells die at one time. B. Cells die at increasingly greater rates. C. Only older cells die in a culture. D. Cells in a culture die at a constant rate. E. Cells become metabolically inactive but are never killed.
Living as a member of a group may have all of the following advantages except what?
A. increased feeding rate B. members learn about new food sources from other members C. greater protection from predators D. more individuals scan the environment for dangers E. being more resistant to disease and parasites