A CD8+ T cell binds to an antigen only if this antigen is____
a. in a complex with a class I MHC protein
b. in a complex with a class II MHC protein
c. in a complex with a class III MHC protein
d. not in a complex with MHC proteins
e. presented on the surface of a B cell
ANSWER: a
You might also like to view...
Which of the following sequence of events of fertilization is in the proper order?
A. acrosomal reaction, binding of sperm to egg membrane, fast block to polyspermy, increase in egg cytosolic calcium, and then the slow block to polyspermy B. binding of sperm to egg membrane, acrosomal reaction, fast block to polyspermy, slow block to polyspermy, and then an increase in egg cytosolic calcium C. binding of sperm to egg membrane, acrosomal reaction, fast block to polyspermy, increase in egg cytosolic calcium, and then the slow block to polyspermy D. acrosomal reaction, fast block to polyspermy, binding of sperm to egg membrane, increase in egg cytosolic calcium, and then the slow block to polyspermy E. acrosomal reaction, fast block to polyspermy, binding of sperm to egg membrane, slow block to polyspermy, and then an increase in egg cytosolic calcium
Which of the following vectors transmit scrub typhus?
a. Lice b. Ticks c. Fleas d. Chiggers
Water can maintain a constant temperature better than some other liquids because _____
1.hydrogen bonding keeps the water molecules from moving around too much 2.cohesion forms a seal that keeps heat out 3.heat is generated by ions and there are few ions in water 4.covalent bonds remove energy from the system and keep water cool
Describe the mechanisms that lead to multiple births. What will be an ideal response?