These antigens are responsible for the rejection of transplanted tissues or organs from donors that are "incompatible." 

A. human leukocyte antigens
B. histocompatibility antigens
C. HLA
D. All of the choices are true.


D. All of the choices are true.

Biology & Microbiology

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There is generally only one valid explanation for an observation

Indicate whether the statement is true or false

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Describe the differences between heterochromatin and euchromatin in chromosomes. Are there any situations in which one can be changed into the other?

What will be an ideal response?

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Transcription starts at a _________ and ends at a ____________.

a. transcriptional start site; terminator b. promoter; 5' end c. promoter; terminator d. 3' end; 5' end

Biology & Microbiology

A signal molecule will ________ to a receptor if the molecules' shapes match, similar to a key in a lock

Fill in the blank(s) with correct word

Biology & Microbiology