Indicate the proper order of events that occur in fertilization.
What will be an ideal response?
a. Sperm cover the surface of the egg and secrete enzymes that help weaken the corona radiata.
b. Sperm squeeze through the corona radiata and bind to the zona pellucida.
c. The acrosomes of sperm release digestive enzymes that allow the sperm to pass through the zona pellucida to the egg plasma membrane.
d. The "fast block" occurs.
e. The "slow block" occurs.
f. Microvilli bring the entire sperm into the egg.
g. Pronuclei are formed.
h. A single nuclear envelope surrounds both sperm and egg pronuclei.
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Which of the following cells are involved in cell-mediated immunity and also respond to class I MHC molecule-antigen complexes?
A) cytotoxic T cells B) natural killer cells C) helper T cells D) macrophages E) B cells
The function of a kinase is
A) methylation. B) response regulation. C) phosphorylation. D) glycosylation.
The first amino acid in a growing polypeptide chain is _____
a. methionine b. valine c. lysine d. phenylalanine e. glycine
Which of the following is(are) false regarding
B cells with antigen-MHC complexes? a. They are stimulated by helper T cells to secrete cytokines. b. Helper T cells signal them to divide and differentiate. c. On signals from the helper T cells, they produce clones with identical receptors. d. Once activated by signals from helper T cells, they produce IgG, IgA, or IgE immunoglobulins instead of membranebound IgM. e. All of these are true.