Which of the following is NOT an adhesion mechanism that bacteria use to attach to a host?
A) fimbriae attach to epithelium of host
B) glycocalyx anchors the microbe to the host
C) dextran slime layer glues the microbe to the host surface
D) envelope spikes puncture cells for entry
Ans: D) envelope spikes puncture cells for entry
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Which type of microscopy transforms the subtle variations in cell density into differences in light intensity, allowing for increased internal detail without staining?
A. Confocal B. Bright-field C. Phase-contrast D. Fluorescence E. Electron
Outside the brain and spinal cord, which cells provide insulation to nerves?
a. microglia b. astrocytes c. oligodendrocytes d. Schwann cells e. satellite cells
What cell type secretes perforins as part of the nonspecific defense mechanism?
A) macrophages B) helper T cells C) plasma cells D) mast cells E) natural killer cells
The respiratory system is unlike the digestive system in that air flows into and out of the same opening.
Answer the following statement true (T) or false (F)