V Fill in the blank(s) with the appropriate word(s)
ANSWER: carcinogenesis
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How do cytotoxic T cells recognize that a transplant is foreign?
A. Presence of different complement factors on the graft B. Presence of different class I MHC molecules on the graft C. Presence of different class II MHC molecules on the graft
Differentiate between endotoxins and exoenzymes
What will be an ideal response?
Rhizobium bacteria live in root nodules and
A. fix carbon dioxide so that the carbon may be used to build glucose. B. increase the surface area, thereby increasing the water absorbing capacity of the plant's roots. C. fix atmospheric nitrogen to NH4+ to build organic compounds. D. All of the answer choices are correct.
Of all the species that have ever lived on Earth, how many have gone extinct?
A. Less than 1% B. About 10% C. About 25% D. About 75% E. About 99%