The theory of clonal selection postulates that a naive T cell is selected to divide because ________
a. cytokines secreted by a helper T cell stimulate it
b. complement bound to it
c. its receptors bind to the antigen of an invading organism
d. an effector T cell presented antigen to it
c
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Some of the high G + C Gram-positive bacteria such as Arthrobacter divide by means of snapping division.
Answer the following statement true (T) or false (F)
The state of Texas passed a law to require
a. AED devices at all high school sporting events. b. AED training for all teachers in the state. c. CPR training for all parents of high school athletes. d. all AED’s to be tested on an animal prior to use in humans. e. none of these.
Figure B represents
a. translocation. b. deletion. c. base substitution. d. duplication. e. inversion.
A common name for secondary plant growth in stems is ________.
Fill in the blank(s) with the appropriate word(s).