An infected intravenous (IV) catheter tip grew out gram-positive cocci, which were catalase positive and coagulase negative. The zone size of the novobiocin disk measured 18 mm. The most likely organism causing infection is:
a. S. saprophyticus.
b. S. epidermidis.
c. S. hominis.
d. S. cohnii.
B
Resistance is indicated by an inhibition zone diameter of less than 10 mm. Only S. epidermidis is novobiocin sensitive.
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Amplification of DNA is accomplished by ________.
A. gene probes B. DNA sequencing C. the polymerase chain reaction D. a Southern blot E. a Western blot
Knowledge of silencing genes provided scientists with clues to the expression of what characteristic in flowers such as petunia?
A. number of flower parts B. placement of flower parts C. color expression D. vitamin deficiencies E. time of flowering
What is/are true of the polymerase chain reaction?
a. PCR allows for the mass production of a specific DNA sequence without cloning. b. PCR permits scientists to target a single copy of a single gene among millions of other sequences. c. PCR allows scientists to study DNA from samples of finite amounts, such as from fossils, or small tissue samples left at a crime scene. d. PCR cannot be used to clone DNA of unknown sequence e. all of these
Leaves
a. intercept sunlight. b. of some species form toxins. c. actively orient relative to the sun to favor optimal position. d. come in simple and compound forms. e. fit all of these descriptions.