The interaction between an antibody and its antigen is most similar to which of the following?

A. a codon and its anticodon
B. an enzyme and its substrate
C. a receptor and its ligand
D. a motor protein and its cytoskeletal
filament


C

Biology & Microbiology

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The act of nursing stimulates the contraction of smooth muscle cells in the breast. If a newborn infant is unable to nurse, then

A. progesterone secretion is not inhibited. B. milk is not produced. C. oxytocin is not secreted. D. prolactin is not secreted. E. prostaglandins are not secreted.

Biology & Microbiology

Which of the following best describes the autoimmune response?

a. An antibody activating the humoral immune response in response to a foreign body b. The T H 1 cytokine-mediated inflammatory response to an antigen c. An antibody marking parts of one’s own body as foreign d. An antibody-mediated immune response that happens within minutes of exposure to a usually harmless antigen

Biology & Microbiology

How many different alleles for ABO blood types in the total human population exist?

a. two b. three c. four d. six e. nine

Biology & Microbiology

The phenomenon in which different-sized gaps in corridors allow certain organisms to cross and restrict others is referred to as the ________ effect

Fill in the blank(s) with correct word

Biology & Microbiology