Which of the following is TRUE of both T cells and B cells?
A. They are lymphocytes.
B. They recognize specific antigens on the cell surface.
C. They have class I MHC molecules on their cell surface.
D. They are involved in the humoral immune response.
E. All of the responses are correct.
E. All of the responses are correct.
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In the identification of mycobacterial isolates, the catalase test involves the:
a. breakdown of phenolphthalein disulfate into phenolphthalein and other salts. b. measurement of the height of a column of bubbles of oxygen. c. production of a lipase that is able to hy-drolyze the catalase. d. development of a pink-to-red color, indi-cating a positive result.
Viruses are unable to multiply outside of a host cell.
Answer the following statement true (T) or false (F)
Duffy factor is due to a chemical that occurs on the membranes of red blood cells and is sometimes used as a blood-typing attribute in the same way that ABO and Rh factor blood types are used
Recent research has found that people with Duffy factor are about 40% less likely to be infected with HIV, given similar circumstances. Given that HIV affects white blood cells, how would you characterize the Duffy factor gene, and why?
What error of meiosis leads to both a duplication and a deletion?
A) unequal crossing over B) X-ray chromosomal breakage C) replication cross formation D) replication errors E) D loop formation