You are performing a Gram stain on gram-positive bacteria and you stop after the addition of the counterstain. What is the appearance of the bacteria at this point?
A) purple
B) red
C) colorless
D) brown
A
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What is misleading about commercials that show "scientific proof" that laundry detergent X is better than another leading brand?
A. We do not know if everything besides the detergents was the same (machine used, type of stains, etc.). B. We are shown only one tee-shirt becoming whiter in each detergent, not 20 tee-shirts in each detergent. C. We do not know whether the same amount of each detergent was used for washing. D. All of the above are aspects that are misleading.
What type of epithelial tissue lines the upper respiratory tract?
a. pseudostratified columnar epithelium b. simple squamous epithelium c. ciliated columnar epithelium d. stratified squamous epithelium e. ciliated squamous epithelium
What is the most radiosensitive phase of the cell cycle?
a) Mitosis b) G1 c) Synthesis d) G2
What are on the surface of most vertebrate cells, acting as markers of "self"?
A. T-cell receptors B. Major histocompatibility complex proteins C. Immunoglobulins D. Antigens