Which order below reflects the correct procedure for Gram staining?
A. alcohol/acetone-crystal violet-safranin-iodine
B. crystal violet-alcohol/acetone-iodine-safranin
C. crystal violet-iodine-alcohol/acetone-safranin
D. iodine-safranin-crystal violet-alcohol/acetone
E. alcohol/acetone-safranin-crystal violet-iodine
Answer: C. crystal violet-iodine-alcohol/acetone-safranin
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A Weil-Felix test was performed on serial dilutions from a patient bitten by a tick. The results obtained were positive for OX-19 and negative for OX-2 and OX-K. Based on these findings, the organism can be identified as:
a. R. rickettsii. b. O. tsutsugamushi. c. Rickettsia prowazekii. d. Rickettsia typhi.
The majority of the water in xylem sap typically ____
a. is used in capturing light energy b. becomes part of new plant cells c. is used to make sugars d. is stored in older plant cells e. evaporates into the air
Which structural gene of the lac operon can be mutated without affecting the cell's ability to break down lactose?
A) lacZ B) lacY C) lacA D) lacP E) lacO
The proper sequence, beginning to end, for the stages of mitosis is
A. prophase-metaphase-anaphase-telophase. B. anaphase-prophase-metaphase-telophase. C. prophase-anaphase-metaphase-telophase. D. telophase-anaphase-metaphase-prophase.