Two-dimensional gel electrophoresis ________.
A. separates proteins based on their size
B. can be used to resolve thousands of proteins in a complex mixture
C. separates proteins based on their isoelectric pH
D. All of the choices are correct.
Answer: D
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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.
When a photon is absorbed by a pigment (light-absorbing molecule), such as chlorophyll, the energy of the photon is transferred to
A) D1 protein to activate PSII. B) ATP synthase to make ATP. C) an electron to move it from a low to a high energy orbital. D) Plastocyanin to be passed on to PSI. E) NADP+ to make NADPH.
Which of the following statements is true of bacterial plasmids?
A) They are always found in the nucleoid. B) They can replicate autonomously. C) They carry genes for essential metabolic functions. D) They are small circular DNA molecules. E) They are small circular DNA molecules that can replicate autonomously.
The insects were the first organisms to
(a) show bilateral symmetry. (b) exhibit segmentation. (c) fly. (d) develop lungs.