Sigma Factor Variation & Abundance
What will be an ideal response?
•Different sigma factors recognize different promoters.
-By using one sigma factor for multiple genes, bacteria can coordinate function.
•Sigma factor abundance directly affects RNA polymerase activity: making more of a sigma factor will lead to more transcription of associated gene(s).
•Typically environmental sensing systems control sigma factor production.
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Outline the four levels of protein structure that give the protein its three-dimensional shape and determine its function
What will be an ideal response?
A researcher wants to mutagenize an organism. He is not in need of a large number of mutants but is more concerned with being able to find and then to amplify the mutated sequence. Which of the following would therefore be more useful?
A) ionizing radiation B) UV radiation C) transposon insertion D) a chemical mutagen E) search for spontaneous mutant
The stress response depends on the secretion of
a. cortisol. b. epinephrine. c. norepinephrine. d. all of these. e. none of these
The ________ is the source of new cells in the meristem.
A. Stem cell reservoir B. Schlerenchyma C. Lateral cells D. Procambium E. Sapwood