Lymphocytes
A) Gain tolerance to self by destruction of lymphocytes that could react against self.
B) Possess MHC antigens for recognizing self.
C) Develop into clones of B and T-cells with extreme variations of specificity.
D) Have membrane receptors that recognize foreign antigens.
E) All of these choices are correct
E) All of these choices are correct
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Genetic variation can originate both from the production of new alleles and from the arrangement of
existing alleles.
Indicate whether the statement is true or false.Smooth muscle is found in the walls of the what?
What will be an ideal response?
The American holly tree requires a "male" tree and a "female" tree to produce red berries in the winter, which indicates that the male flowers lack ________ and the female flowers lack ________
A) sepals; anthers B) petals; carpels C) petals; ovules D) anthers; stamens E) carpels; stamens
Which of the following is involved in unconscious contraction responsible for dilating or constricting your blood vessels and airways?
a. Simple squamous epithelium b. Simple cuboidal epithelium c. Smooth muscle d. Simple columnar epithelium e. striated muscle tissue