In order to mount a response, particular B or T cells must express the appropriate ________ that will bind to the ________.
A) antigen : antibody
B) antigen : antigen receptor
C) epitope : antigen
D) antigenic determinant : antigen
E) antigen receptor : antigen
Answer: E) antigen receptor : antigen
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Despite viruses require a living host's metabolism to replicate, it remains unclear whether viruses existed before living cells
Indicate whether the statement is true or false.
Molecules brought into the cell from the exterior are placed into vesicles for routing to other locations
such as ____.
a. the nucleus b. lysosomes c. mitochondria d. ribosomes e. cholorplasts
A region of plant tissue where sugars are being produced or released from storage is called ____
a. cortex b. plasmodesmata c. stoma d. a source e. a sink
The depolarization of the heart is initiated by the
A. sinoatrial node. B. bundle of HIS. C. Purkinje fibers. D. left and right bundle branches. E. atrioventricular node.