Why must amphibians remain moist?
What will be an ideal response?
ANSWER: Even though an amphibian may contain lungs and/or gills, those structures do not entirely
meet the respiration needs of the animal. In addition, respiration occurs through the skin,
and a moist environment is necessary for gas exchange to take place effectively through
the skin.
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Which of the following cells are classified as phagocytes? Select all correct choices
A. macrophages B. natural killer cells C. neutrophils D. mast cells E. plasma cells
Answer the following statements true (T) or false (F)
1. The exoenzyme that causes toxic shock syndrome is called erythrogenic toxin. 2. The neurotoxins produced by Clostridium botulinum and Clostridium tetani cause a spastic, rigid type of paralysis. 3. Although most people use the terms “infection” and “infectious disease” synonymously, microbiologists define infection as colonization by a pathogen. 4. Avirulent strains do not cause disease. 5. It is thought that the waxes in the cell walls of Mycobacterium tuberculosis protect this pathogen from digestion within phagocytes.
A cell with a diploid number of 24 fails to undergo cytokinesis while performing mitosis, so the daughter cells do not form. How many chromosomes will be in the resulting cell?
A) 24 B) 48 C) 96 D) 12
Which of the following terms is associated with the release of nonenveloped or complex viruses from the host cell?
A) Budding B) Exocytosis C) Lysis D) Phagocytosis E) Endocytosis