Chapter 6, Problem 2R

The man pictured in Figure 4.17 wears skin ornaments applied by piercing. Among other functions, the skin is a barrier to potentially dangerous bacteria, and some people object to extensive body piercing on the grounds that it opens the door to infections. Explain why you do or dont agree with this objection. Figure 4.17 This young man has chosen to undergo multiple body piercings.

Bacilli, which are rod-shaped, spore-forming bacteria, cause _____________________. Lyme disease measles rubella anthrax

Which of the following diseases is not due to autoimmunity? rheumatic fever systemic lupus erythematosus diabetes mellitus HIV/AIDS

______ are barriers to pathogens at body surfaces. a. Intact skin and mucous membranes b. Tears, saliva, and gastric fluid c. Resident bacteria d. All are correct

Figure 21.10 Which of the following statements is false? In the lytic cycle, new phages are produced and released into the environment. In the lysogenic cycle, phage DNA is incorporated into the host genome. An environmental stressor can cause the phage to initiate the lysogenic cycle. Cell lysis only occurs in the lytic cycle.

Figure 21.5 Which of the following statements about virus structure is true? All viruses are encased in a viral membrane The capsomere is made up of small protein subunits called capsids. DNA is the genetic material in all viruses. Glycoproteins help the virus attach to the host cell.