Which of the following statements concerning plasma cells is FALSE?
A. They live for many years and function as memory cells.
B. They are descended from activated B cells.
C. They can produce large quantities of antibodies on a daily basis.
D. They secrete a single type of antibody molecule specific for a single epitope.
E. The antibodies they produce can remain in circulation for weeks.
Answer: A
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The example of agarose displayed is composed of two chains coiled around each other in a helical (spiral) fashion. Agarose molecules are generally composed of hundreds of sugar residues. Approximately how many residues are in each of the chains?
a. 2 b. 4 c. 6 d. 8
A microaerophile
A. needs normal atmospheric levels of oxygen. B. requires a small amount of oxygen but won't grow at normal atmospheric levels of oxygen. C. grows best in an anaerobic jar. D. grows with or without oxygen.
The main function of the mononuclear phagocyte system is to provide
A. a connection between tissues and organs. B. filtration of blood. C. surveillance cells. D. filtration of extracellular fluid.
Which of the following correctly describes the order of events that occur when you touch a very hot surface?
1) action potential in sensory neuron 2) sensory receptor absorbs energy from stimulus 3) receptor potential produced 4) stimulus is transduced into electrical energy a. 1 ? 3 ? 4 ? 2 b. 2 ? 1 ? 4 ? 3 c. 2 ? 4 ? 3 ? 1 d. 4 ? 1 ? 3 ? 2 e. 3 ? 1 ? 4 ? 2