Comparison of two-dimensional gels from cells in stationary versus active growth phases reveals that one protein (A) has disappeared and a slightly larger protein (B) has appeared in the active cells
Mass spectrophotometry of the two spots indicates that the new larger protein (B) has sequences that match the smaller protein (A). Which of the following statements is not supported by this result?
A. Proteins A and B are the same; however protein A has been covalently modified by phosphorylation.
B. Proteins A and B are the same; however protein B has been bound by a cofactor.
C. Proteins A and B are the same; however protein B has been bound by metal ions.
D. Proteins A and B are the same; however protein B has been covalently modified by phosphorylation.
E. Proteins A and B are the same; however protein A has been covalently modified by proteolytic cleavage.
A
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Which method is most commonly used in metabolomics?
A) ion torrent semiconductor sequencing B) mass spectrometry C) 2D polyacrylamide gel electrophoresis D) Sanger method
The correct sequence of plant cell wall layers, beginning with the outermost layer and progressing
inward to the plasma membrane is ____.
a. secondary cell wall, middle lamella, primary cell wall b. middle lamella, primary cell wall, secondary cell wall c. middle lamella, secondary cell wall, primary cell wall d. secondary cell wall, primary cell wall, middle lamella e. primary cell wall, middle lamella, primary cell wall
12C, 13C, and 14C are all isotopes of carbon. They differ in their
a. overall charges. b. number of electrons. c. number of protons. d. number of neutrons. e. electron energy shells.
During elongation, ribosomes catalyze formation of a ____ bond between an amino acid and the growing polypeptide
a. hydrogen b. peptide c. polar covalent d. non-polar covalent e. sulfur