Laboratory animals must be used to determine lethal and infectious doses of viruses.
Answer the following statement true (T) or false (F)
False
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If water is scarce, a plant's guard cells will and the stomata will .
A. swell; close B. collapse; open C. collapse; close D. swell; open E. None of the answer choices is correct.
In comparing innate immunity to adaptive
immunity, which of the following statements is (are) correct?
a. Innate immunity has a response time of about a week; adaptive immunity has an immediate response time. b. Innate immunity uses billions of different antigen receptors to detect antigens; adaptive immunity has a fixed set of receptors. c. Innate immunity does not target specific antigens; adaptive immunity does target specific antigens. d. Innate immunity has a long persistence; adaptive immunity does not persist. e. Both a and b are correct
Which statement is true?
1.Both the parasympathetic and sympathetic nervous systems send nerves to all organs. 2.The sympathetic nervous system that supplies an organ will also provide parasympathetic nerves to it. 3.The sympathetic branch can have either excitatory or inhibitory effects depending on effects from the environment. 4.The sympathetic branch of the autonomic system usually speeds up the activities of the body. 5.The parasympathetic system usually speeds up the activities of the body.
Nutrient processing is a ____ process.
A. metabolic B. generative C. responsive D. control