A CD8+ T cell binds to an antigen only if this antigen
a. is in a complex with a class I MHC protein.
b. is in a complex with a class II MHC protein.
c. is in a complex with a class III MHC protein.
d. is NOT in a complex with MHC proteins.
e. is presented on the surface of a B cell.
A
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Which number represents the atomic weight of oxygen?
A. 18 B. 16 C. 6 D. Not enough information given
Which of the following relationships is INCORRECT?
A. maternal effect genes activate gap genes B. gap genes activate pair-rule genes C. pair-rule genes regulate segment polarity genes D. segment polarity genes regulate pair-rule genes E. maternal effect genes activate pair-rule genes
Genetic diseases transmitted only by a mother to both sons and daughters result from ____________________ genesFill in the blank(s) with the appropriate word(s)
English ivy (Hedera helix) and wintercreeper (Euonymus fortunei) are not closely related, yet both have aerial rootlets that allow them to climb up and stick to bark on trees. What type of evolution is this?
A. Convergent. B. Radial. C. Analogous. D. Bivalent. E. Both analogous and convergent.