When the immune system no longer recognizes self-antigens what can result?
a. complement activation
b. allergy attack
c. autoimmune disorder
d. hypersensitivity
c. autoimmune disorder
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The fact that the two strands composing a DNA molecule are called antiparallel has to do with the orientation of the
a. sugar molecules. b. bases. c. phosphate molecules. d. hydrogen bonds. e. sulfide bonds.
Spikes are specialized receptors that allow ____ to attach to host tissues
Fill in the blank(s) with the appropriate word(s).
Which of the following statements is false?
a. The tissues of arthropods are bathed with hemolymph, which delivers oxygen to their cells. b. In an open circulatory system the heart is still responsible for pumping oxygen-rich fluid. c. Earthworms have a central heart that pumps blood to all their tissues. d. Blood vessels are found in the open circulatory systems common to some invertebrates. e. Hemocyanin is the oxygen transport pigment found in the open circulatory system of invertebrates.
The enzyme used to make a DNA copy complementary to processed mRNA is
A. reverse transcriptase. B. transcriptase. C. DNA polymerase. D. RNA polymerase.