Blood plasma contains water mixed with proteins. Therefore, it is considered a

A. colloid.
B. suspension.
C. solution.


Answer: A. colloid.

Biology & Microbiology

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B cells with antigen-MHC complexes? a. They are stimulated by helper T cells to secrete cytokines. b. Helper T cells signal them to divide and differentiate. c. On signals from the helper T cells, they produce clones with identical receptors. d. Once activated by signals from helper T cells, they produce IgG, IgA, or IgE immunoglobulins instead of membranebound IgM. e. All of these are true.

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Antibodies are

a. proteins. b. steroids. c. polysaccharides. d. lipoproteins. e. any of these.

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If too little carbon dioxide is moving out of the lungs, ____

a. the blood pH will rise b. oxygen levels will rise c. bronchioles will relax d. blood vessels will relax e. respiratory activity will decrease

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Astroviruses are common causes of gastroenteritis.

Answer the following statement true (T) or false (F)

Biology & Microbiology