In order to stain flagella so that they may be readily observed by light microscopy, it is usually necessary to increase their thickness.
Answer the following statement true (T) or false (F)
True
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What structure will help prevent the backflow of blood within the veins?
a. Valves b. Skeletal muscle c. Endothelium d. Smooth muscle e. Basement membrane
A 25-year-old woman is seen on an emergency basis while in shock, with generalized flushing of the skin and mucous membranes. A tampon is present in her vagina. Toxic shock syndrome is suspected. Which of the following mechanisms is responsible for the toxic shock syndrome?
A. Inhibition of acetylcholine release B. ADP ribosylation of ribosomal protein C. Stimulation of G protein D. Cross-linking of MHC II and TCR proteins E. Activation of adenylate cyclase
Enzymes that cleave DNA at specific sites are called ________. Cutting by some of these enzymes results in single-stranded, complementary tails called ________.
A. endonucleases; sticky B. peptidases; lagging C. vectors; blunt D. DNases; leading
Describe the effects of mutating a sigma factor gene in bacteria
What will be an ideal response?