The tissue antigens most involved in graft rejection involve
A. Rh.
B. ABO.
C. MHC.
D. MLB.
C
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Why are adhering junctions common in tissues subject to constant abrasion or stretching, such as skin?
a. These cells need to communicate by allowing cytoplasm to flow between adjacent cells. b. The cells in these tissues require strong cell-to-cell junctions to hold them together. c. Adhering junctions prevent harsh enzymes from flowing between adjacent cells.
d. These tissues do not have basement membranes. e. Adhering junctions allow production of a protective cuticle.
How does the founder effect influence the frequency of alleles in a population?
What will be an ideal response?
In the Sonoran desert, a species of cactus pollinated by hawkmoths closes its flowers at dawn (and reopens them at dusk). Propose a possible proximate and ultimate explanation for this.
What will be an ideal response?
homeostasis
What will be an ideal response?