What would be the advantage of having multiple sigma factors that each could be produced under different stress conditions in E. coli?
What will be an ideal response?
Different sigma factors recognize different promoter region sequences. Therefore, they play a role in the regulation of gene expression. Sigma factors produced under a particular stress condition, such as excessive heat or infection by bacteriophage, bind to promoters that belong to genes that encode proteins required to cope with those stresses.
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Vascular bundles primarily contain ________
a. pith and cortex b. epidermis c. parenchyma d. xylem and phloem
Myoglobin is a protein found in the muscles of cetaceans that:
a. stores energy. b. stores oxygen. c. maintains buoyancy. d. maintains heat. e. stores ATP.
Which of the following recognizes antigens displayed on host cells with MHC II?
A) TC cell B) B cell C) TH cell D) natural killer cell E) basophil
Compare and contrast carbon fixation and nitrogen fixation.
What will be an ideal response?