Which statement about erythrocytes is true?
A. Erythrocytes are biconcave in shape.
B. Erythrocytes are round, multinucleated cells.
C. Erythrocytes function to transport oxygen and carbon monoxide.
D. Erythrocytes function to fight off infection.
Answer: A
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A ________ is a motor neuron whose cell body is in the CNS and which will synapse on a cell body in a peripheral ganglion.
Fill in the blank(s) with the appropriate word(s).
Interferon
a. is released from viruses b. triggers the production of viral-blocking enzymes by cells that have not yet been invaded by viruses c. directly breaks down viral messenger RNA d. inhibits protein synthesis, both of which are essential for viral replication e. have characteristics b and d
Interferon
a. forms a membrane-attack complex b. causes lysis of invading microbes c. nonspecifically defends against viruses d. stimulates histamine release from mast cells e. is secreted by lymphoid tissues
Baldness is believed to be caused by the male sex hormone ______.
A) estrogen B) insulin C) steroid D) testosterone E) aldosterone