Bacteria in biofilms are often more difficult to treat with antibiotics than planktonic bacteria.
Answer the following statement true (T) or false (F)
True
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Which of the following is currently the only fixative available that does not contain formalin, polyvinyl alcohol (PVA), or mercury?
a. Merthiolate-iodine-formalin (MIF) b. Sodium acetate–acetic acid–formalin (SAF) c. ECOFIX d. TOTAL-FIX
Refer to the accompanying figure. The structure labeled as 7 in the figure of the tryptophan operon is a(n):
a. active repressor protein. b. inactive repressor protein. c. active RNA polymerase. d. inactive RNA polymerase. e. ribosome.
Common colds are upper respiratory tract infections. Why are vaccinations against the common cold not practical?
A. Vaccinations do not work in the upper respiratory tract. B. There are so many different strains of viruses that cause colds it would be impossible to develop a vaccine against all of them. C. Colds are caused by viruses that cannot be prevented by vaccinations. D. Vaccines are very costly to develop. E. Vaccines would not work against the common cold because it is caused by a bacterial infection.
The human immunodeficiency virus targets:
A) helper T cells. B) all white blood cells. C) bone marrow cells. D) lymph nodes.