During presentation of APC-bound antigen, macrophages secrete a cytokine that activates T helper cells. What is the name of this cytokine?
A. interleukin-2
B. IgM
C. the major histocompatibility complex
D. interleukin-1
Answer: D
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All of the following are diameters of cells that would be resolved in a microscope with a limit of resolution of 0.2 µm except ________.
A. 2.0 µm B. 0.2 mm C. 0.1 µm D. 0.2 µm
A single, weak contraction of a muscle fiber is called
a. an action potential. b. a muscle twitch. c. fatigue. d. tetanus. e. constriction.
What separates in meiosis I to reduce the diploid number (2n) of chromosomes to the haploid number (n)?
What will be an ideal response?
Which one of the following is the correct classification of vertebrae, from the skull to the pelvis?
A) sacral, coccygeal, lumbar, thoracic, cervical B) cervical, thoracic, lumbar, coccygeal, sacral C) cervical, thoracic, lumbar, sacral, coccygeal D) coccygeal, thoracic, lumbar, sacral, cervical E) coccygeal, thoracic, lumbar, cervical, sacral