Clonal deletion of developing T lymphocytes takes place in which location(s) in the body?
A) the bone marrow
B) the spleen
C) the liver
D) both the bone marrow and the spleen
E) the thymus
E
Bloom's Taxonomy: Comprehension
Section: Elements of Adaptive Immunity
Learning Outcome: 16.15
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Examine the figure above. In the continental U.S., the dark green patches show areas with the highest bird species richness. What best explains why these areas have such diversity?
A. These areas have the highest temperatures in the continental U.S.
B. These areas have mountainous terrain.
C. These areas have well-protected natural areas.
D. These areas have low frequencies of extreme weather events and fire.
What causes the large majority of errors in DNA replication?
1.chemical carcinogens 2.the speed of the replication process 3.the complexity of the replication machinery 4.mutations in proofreading and repair genes
The basic unit of the nervous system is
a. the neuron. b. neuroglia. c. the brain. d. a nerve. e. a nerve impulse.
Which event is associated with leaf abscission?
a. Chlorophyll breaks down. b. Anthocyanins degrade. c. Carotenoids are transported from the leaves. d. Sugars accumulate in the leaves. e. Leaves turn dark green.