A population of cells is treated with a polypeptide hormone that induces mitosis and the hormone's cell surface receptor is isolated after 15 minutes and subjected to fragmentation and mass spectometry
Several of the peaks show a slight shift as compared to the same protein from cells not treated with the hormone. What is the most likely explanation of this phenomenon?
A. Phosphorylation of some amino acid residues
B. mRNA editing resulting in a slightly different amino acid sequence.
C. Alternative exon usage.
D. Proteolytic processing.
A
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Maquiladoras (manufacturing firms that import components for assembly and re-export) are found
A) in Mexico, clustered near the U.S. border. B) in Canada, clustered in and around Quebec. C) throughout Spanish-speaking communities of North America. D) throughout the world's periphery. E) in the Philippines, in export-processing zones.
During the stringent response, ppGpp-regulated genes for amino acid biosynthesis have a(n) ________-rich promoter, thus forming a ________ open initiation complex.
A. GC-rich; more stable B. AT-rich; less stable C. GC-rich; less stable D. AT-rich; more stable
Crossing over takes place between sister chromatids during prophase I of meiosis I
Indicate whether the statement is true or false
The study of physical inheritance among living things is:
A) genomics. B) genetics. C) reproduction. D) proteomics.