Adaptive immunity is sometimes also called acquired immunity. Which of the following statements provides a basis for the alternative name?
A) Lymphocytes of the adaptive immune system are highly specific for a single antigenic determinant.
B) Activated lymphocytes produce daughter cells that are identical in specificity and function.
C) To become activated, lymphocytes require exposure to the antigenic determinant for which they are specific.
D) Activated lymphocytes may persist for years in the body.
E) Lymphocytes reactive to normal body components are removed.
C
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If you wanted to increase the cation exchange and water retention capacity of loamy soil, you should _____
A) adjust the soil pH to 7.9 B) add clay to the soil C) practice no-till agriculture D) add fertilizer containing potassium, calcium, and magnesium to the soil E) increase the number of sand particles in the soil
In Engelmann's 1882 experiment, why did bacteria cluster in red or blue wavelengths of light?
a. The bacteria used those wavelengths to photosynthesize. b. Algae photosynthesized best at those wavelengths, producing needed oxygen. c. The bacteria produced oxygen most efficiently using red and blue light. d. Algae photosynthesized best at those wavelengths, producing needed carbon dioxide. e. The bacteria were attracted to bright light.
Stem cell transplants may someday be used to treat Parkinson's disease. Researchers are hopeful that these cells would alleviate the symptoms of Parkinson's disease by _____
A) preventing temporal lobe seizures B) repairing sites of traumatic brain injury C) replenishing missing ion channels D) secreting the neurotransmitter dopamine
Why don't sulfa drugs target mammalian cells?
A) Mammalian cells produce inhibitors to the sulfa drugs. B) Mammals make their own folic acid but use a completely different substrate to start the process and therefore sulfa drugs are unable to disrupt the process. C) Mammalian cells do not use folic acid and therefore do not have the enzyme that these drugs target. D) Sulfa drugs do target mammalian cells but the bacteria die so quickly that the patient experiences mild symptoms but can then stop taking the medication before experiencing any serious symptoms. E) Mammals do not make their own folic acid and therefore do not have the enzyme that these drugs target.