Which of the following statement(s) about the hydrologic cycle is (are) true?
A. Some water evaporates from land and from plants.
B. Once water sinks into the ground, it is safe from human exploitation or pollution until it has rejoined the ocean.
C. All water molecules that evaporate from the ocean precipitate on land and move by gravity through groundwater to the ocean again.
D. Because this is a true cycle, it is impossible to run out of fresh water for human use.
E. All of the choices are true.
Answer: A
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Molecular biologists use restriction enzymes to amplify a specific section of DNA within the genome
Indicate whether the statement is true or false
Algae
A. often grow in areas where other forms of life may have difficulty. B. are strictly macroscopic organisms. C. have a vascular system similar to plants. D. are only found in the soil.
Serotonin is mostly found in the digestive tract.
a. true b. false
Why is the immune response to pneumococcal meningitis the most damaging aspect of the disease?
A) Blood clots are formed in the circulatory system in an effort to isolate the bacteria; however, these clots are often the cause of heart attack or stroke in patients that don't seek medical treatment. B) A particularly potent endotoxin stimulates a rapid fever that typically holds at 104°C for 3-4 days unless other actions are taken. C) An exotoxin stimulates severe inflammation and provokes host tissue damage as immune cells release oxygen radicals and enzyme-destroying proteins in response to the toxin. D) Neurons infected with the bacteria are identified and destroyed by the immune system resulting in paralysis or in some cases death. E) Released antibodies bind to the basal membrane of tissues which results in the damage of these tissues and the neighboring cells.