MHC proteins
a. are always expressed on cell surfaces.
b. have embedded peptides derived from breakdown products of cell metabolism.
c. present peptide antigens to CLSs and Th cells.
d. are described by all of the above.
Answer: D
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Determination ____, while differentiation ____
a. is a cell's commitment to a developmental fate; is a cell's development into specialized cell types b. is a cell's development into specialized cell types; is a cell's commitment to a developmental fate c. is permanent; is reversible d. is a result of a cell's own genetic program; is a result of influence by other cells e. results in the final fate of a cell; results in determination
Answer the question using the accompanying figure. Which letter represents the littoral zone?
a. A only b. B only c. C only d. A and B e. B and C
The validity of a prediction in the scientific method is determined by experimentation or observation
Indicate whether the statement is true or false
Contact with a minute quantity of blood is sufficient for infection with hepatitis B virus.
Answer the following statement true (T) or false (F)