You are studying a protein in Salmonella typhimurium that you believe is a toxin. Whenever you attempt to purify the protein from lysed cell cultures, you get two forms of the protein
One form is smaller than the other and is missing 15 amino acids from the N-terminus compared to the larger form. This leads you to hypothesize that
A) there are two termination sites in the mRNA.
B) the protein requires chaperonins to fold properly.
C) the protein is secreted and folds outside of the cell.
D) you need to re-do the experiment because there should only be one form.
Answer: C
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The reaction diagrammed to the right (more than once answer may apply):
A. is the final reaction of glycolysis. B. is one possible pathway in the fermentation of pyruvate. C. shows synthesis of the substrate that enters the citric acid cycle. D. occurs in the cytosol. E. occurs in the mitochondrial matrix. F. occurs twice for each glucose oxidized.
In crustaceans, molting is stimulated by the hormone ________
a. estrogen b. ecdysone c. FSH d. TSH
Contact immunity within a population can be produced by ________ vaccines
A) attenuated B) DNA C) inactivated D) subunit E) toxoid
Answer the following statement(s) true (T) or false (F)
1. the forces that muscles generate can stabilize or destabilize joints 2. The rotaty component of a force tends to produce torque 3. power is the product of force and velocity 4. if a 30 year old, sedentary man begins a weight lifting program, he will likely experience hypertrophy 5. bodybuilders use the short rest and high intensity training to build up the size of the muscle at the expense of losing some strength gains achieved with a longer rest period