Some simple epithelia have one layer that appears to be several layers due to the cells' nuclei not lining
up. This type of tissue is
a. stratified.
b. columnar.
c. cuboidal.
d. squamous.
e. pseudostratified.
E
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The ________ is a factor-independent termination site found in the leader region of certain operons, which, under the influence of ribosome behavior, controls the continued transcription of that operon.
A. terminator B. operator C. attenuator D. modulator
High blood pressure in mammals reflexively causes a decrease in heart rate, which results in lowered blood pressure. This is a __________ because ____________
A. negative feedback loop; response to the signal results in a decrease of that signal B. negative feedback loop; response to the signal results in an increase of that signal C. positive feedback loop; response to the signal results in a decrease of that signal D. postive feedback loop; response to the signal results in an increase of that signal E. None of the above are correct.
Humoral immunity involves all the following except:
A) antibodies. B) antigens. C) NK cells. D) plasma cells.
Why is the tuberculosis bacterium so hard to treat and destroy in the body?
What will be an ideal response?