Which of the following is NOT a descendent
of stem reptiles?
a. mammals
b. birds
c. snakes
d. fish
e. all of these are descendents of stem reptiles
D
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The meninges surrounding the CNS include the
A. dura mater. B. pia mater. C. arachnoid mater. D. All of these choices are correct.
B cells secrete antibodies when they
A) bind antigens. B) are engulfed by macrophages. C) are stimulated by activated T cells. D) undergo apoptosis.
Why is the destruction of helper T cells caused by HIV infection so crippling to adaptive immunity? What will be an ideal response?
Cells that have undergone a response that causes them to enter a permanent state of growth arrest, like those that comprise a mole are said to have entered a state called
a) adolescence b) senescence c) pubescence d) bellioscosityb) senescence