Antigens displayed on the surface of antigen-presenting cells and viral-infected cells are bound to specific classes of
____________________ molecules. Fill in the blank(s) with the appropriate word(s).
MHC
major histocompatibility complex
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Archaeopteris, the first known tree, had what characteristics?
_____ It occurred in forests. _____ It possessed wood. _____ It reproduced by seeds. _____ It had a eustele. _____ It had a vascular cambium.
Enzymes are
a. biological catalysts. b. agents that speed up cellular reactions. c. proteins. d. all of the above.
Antibiotics are most likely to be effective in the treatment of infections caused by
A) bacteria. B) viruses. C) parasitic worms. D) lice and ticks. E) prions.
Patients suffering from familial adenomatous polyposis coli have typically been found to have _________, which is the site of the _________.
a) a small chromosome 5 deletion, APC oncogene b) a small chromosome 5 duplication, APC tumor-suppressor gene c) a small chromosome 5 deletion, APC tumor-suppressor gene d) a small chromosome 15 deletion, RP tumor-suppressor gene e) a small chromosome 6 deletion, APC tumor-suppressor gene