The clonal selection theory states that each antigen-reactive B cell or T cell has a cell surface receptor for a single antigen epitope
Indicate whether the statement is true or false.
Answer: TRUE
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Which of the following is NOT found in an arteriole?
a. elastic layer b. basement membrane c. smooth muscle d. valve e. endothelium
Which of these is NOT an evolutionary advantage of the first cell membranes?
A) Membranes allow cells to move independently. B) Membranes allow for cells to be compartmentalize. C) Membranes allow substances to be concentrated inside a cell, or pumped outside. D) Membranes allow genotypes and the phenotypes they produce to stay linked. E) All of the above are advantages of cell membranes.
According to the animation, ribosomes move along the mRNA in which direction?
a. 5' to 3' b. 3' to 5' c. Either 5' to 3' or 3' to 5'
Cytotoxic T-cells produce _______.
A. perforin, which makes holes in cell membrane of infected cells B. antibodies, which make holes in cell membrane of infected cells C. interferon which attacks viral-infected cell D. class II MHC which present antigens