HIV is able to shut down a person's adaptive
immunity by attacking which type of cell?
a. cytotoxic T cells
b. effector B cells
c. helper T cells
d. macrophages
e. memory B cells
C
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Approximately how often is the blood filtered by the human kidney?
A. 60 times a day (once every 24 minutes) B. 48 times a day (once every half hour) C. 24 times a day (once every hour) D. 288 times a day (once every 5 minutes) E. 144 times a day (once every 10 minutes)
Knowledge of a pathogen's genome is useful because:
A. It allows scientists to cause mutations in the DNA thereby killing the pathogen. B. It allows scientists to prevent meiosis and the duplication of genes necessary for the survival of the pathogen. C. It allows developing drugs that make antibodies against the pathogen. D. It allows developing drugs that target metabolic pathways unique to the pathogen. E. none of the choices provided
Which of the following statements is false?
a. The SRY gene is absent in all females. b. The SRY gene apparently is the gene that controls the development of male sexuality. c. The development of maleness is by default because males lack two X chromosomes. d. The human Y chromosome carries 307 genes. e. Genes on the X chromosome govern color vision.
Which of the following compounds is produced and secreted by mast cells during an allergic reaction?
A) interferon B) allergens C) histamine D) perforin