The clonal selection theory implies that
A. related people have similar immune responses.
B. antigens activate specific lymphocytes.
C. only certain cells can produce interferon.
D. memory cells are present at birth.
E. the body selects which antigens it will respond to.
B. antigens activate specific lymphocytes.
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The plant tissue responsible for producing cells that thicken roots and stems is the
A. vascular bundle. B. intercalary meristem. C. apical meristem. D. lateral meristem. E. tracheid.
Which extraembryonic tissue burrows into, and thus attaches to, maternal tissues?
a. the amnion b. the yolk sac c. the chorion d. the blastocyst protein coat e. the inner cell mass
What condition may be caused by the loss of dopamine leading to motor symptoms, including tremors, rigidity, and slowed movements?
A) Alzheimer's disease B) Huntington's disease C) Parkinson's disease D) depression
A behavioral physiologist is studying the homeostatic control of blood pH. In a trial, a lizard runs on a treadmill for a set amount of time and the blood pH is measured. The blood pH drops as carbon dioxide is released into the bloodstream
Which component of the homeostatic feedback system is responsible for deciding if the blood pH is far enough from normal that a response is necessary? A) effector B) sensor C) integrator D) assimilator