MHC II molecules present
A) processed foreign antigens from proteasomes.
B) processed self-antigens from phagolysosome.
C) antibodies.
D) T cell antigens.
Ans: B) processed self-antigens from phagolysosome.
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Many birds and mammals in the Northern hemisphere are ring species
1.True 2.False
Smoking damages the respiratory tract and can cause bronchitis, emphysema, and cancer.
a. true b. false
The sharing of two pairs of electrons between two atoms is called a(n) ____________________.
Fill in the blank(s) with the appropriate word(s).
When closely related individuals mate with each other, or inbreed, the offspring are often not as fit as the offspring of two unrelated individuals. Why?
a. Close relatives are genetically incompatible. b. The DNA of close relatives reacts negatively in the offspring. c. Inbreeding can bring together rare, deleterious mutations that lead to harmful phenotypes. d. Inbreeding causes normally silent alleles to be expressed.