What is the main advantage of controlled burnings of forested areas? Controlled burnings _____
A) eliminate the possibility of forest fires
B) clear forested areas for farmland
C) prevent the overgrowth of the underbrush
D) allow new species to form
Answer: C
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The production of antibodies that results from the entrance of a foreign object such as a virus or bacterium, into the bloodstream of a host is referred to as
A) allelopathy. B) a behavioral response. C) an inflammatory response. D) an immune response.
Which factor is a population-limiting, density-dependent factor?
A) a heavy flood that destroys a large area around a river B) a heat wave in which some organisms can't survive C) a drought that limits food availability D) the rapid spread of tuberculosis in heavily populated areas
How do cholinesterase inhibitors improve the learning and memory of people who are suffering from Alzheimer's Disease?
A. Cholinesterase inhibitors will decrease the levels of acetylcholine in the brain. This will increase the neural functioning in brain regions associated with learning and memory. B. Cholinesterase inhibitors will increase the levels of testosterone in the brain. This will increase the neural functioning in brain regions associated with learning and memory. C. Cholinesterase inhibitors will decrease the levels of cerebral spinal fluid in the brain. This will decrease neural pressure associated with the brain regions associated with learning and memory. D. Cholinesterase inhibitors will increase the levels of acetylcholine in the brain. This will increase the neural functioning in brain regions associated with learning and memory.
The plasma membranes of some plant cells use transport proteins to move protons out of the cell against their concentration gradient (from areas of low proton concentration to areas of high proton concentration). This is an example of:
a) simple diffusion b) active transport. c) endocytosis. d) facilitated diffusion. e) passive transport