In bacillus anthracis the protective antigen (PA)
A. is a protease that inhibits blood clotting
B. is a protese that inhibits cell growth
C. binds to cells
D. is an adenylate cyclase
Ans: C. binds to cells
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A chromosome’s gene sequence that was ABCDEFG
before modification and ABCDLMNOP afterward is an example of a. inversion. b. deletion. c. duplication. d. translocation. e. aneuploidy.
Which of the following does not illustrate the use of universal precaution methods in the handling of patients and body substances?
A. Healthcare worker with active, open lesions handling patients B. Mask and gloves C. Proper disposal of needles D. Sterilizing or disinfection of dental hand pieces E. Hand washing
Which of the following best describes the relationship of insulin to glucagon?
A) They work together to prepare the body to deal with stress. B) Insulin stimulates the pancreas to secrete glucagon. C) High levels of insulin inhibit pancreatic secretion of glucagon. D) They are antagonistic hormones.
Bacterial smears are fixed before staining to
A) affix the cells to the slide. B) make their walls permeable. C) accept stain. D) make the cells visible.