Which of the following microbes is not correctly matched to an acceptable control method?
A) Enveloped virus: glutaraldehyde-based detergents
B) Endospore: autoclaving
C) Mycobacteria: hydrogen peroxide
D) Prions: chlorine treatment
E) Protozoan: boiling water
Answer: D
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Diapedesis is the movement of white blood cells through intact blood vessel walls into surrounding body tissue. It typically happens when an area of the body is injured or damaged, and an inflammation response is required. What role would you expect cell adhesion molecules to play in this process?
A. Cell adhesion molecules will allow the white blood cells to cling to one another to form a migrating clot. B. Cell adhesion molecules help white blood cells adhere to the blood vessel wall so that they can migrate across the wall and infiltrate into the underlying tissue. C. Cell adhesion molecules will allow the white blood cells to attach to the injured area so they become immobile.
Which of the following statements is TRUE of membrane phospholipids?
A. The hydrophilic head groups face the interior portion of the membrane. B. The hydrophobic tail groups face the exterior portion of the membrane. C. They spontaneously flip-flop from one side of the membrane to the other. D. They freely move laterally within the membrane. E. They rarely flip-flop across or move laterally within the membrane.
Which of the following organs of the human
digestive system does NOT produce any secretions associated with digestion? a. stomach b. liver c. esophagus d. pancreas e. salivary gland
Which is a geological process that reduces atmospheric carbon dioxide?
a) burning of forests b) rainfall c) growth of algae d) formation of fossil fuels