Molecules that stimulate T cells to proliferate nonspecifically, causing the release of massive quantities of cytokines, which, in turn, can lead to tissue damage are called ________.
Fill in the blank(s) with the appropriate word(s).
superantigens
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The production of uric acid is complex and energy intensive, yet it persists as a means of nitrogenous waste disposal in many organisms. What advantage does uric acid excretion offer over urea excretion?
a. Uric acid can be metabolized for energy. b. Uric acid excretion does not require oxygen. c. Uric acid excretion conserves water. d. Uric acid stimulates the immune system.
Which of the following is false about the E. coli Lac operon?
A. it is an example of negative control B. the presence of lactose acts as an inducer C. the repressor binds to the operator D. the mRNA for the receptor binds to the operator
What is the difference between a primary and a secondary source?
A) A primary source is the original material published by the scientists, whereas a secondary source is a description of the original material. B) A primary source is the raw data before scientists publish, whereas a secondary source is a description of the original material. C) A primary source is the original material published by the scientists, whereas a secondary source is the raw data before scientists publish. D) There is no difference between primary and secondary sources.
Place these statements in their proper sequence.Walking through the botanical garden with a friend, you spy a rare and beautiful variety of Hosta. "Oh I would love to have one of those!" you exclaim. "But they cost a king's ransom." Your friend smiles, snips off a tiny piece of the shoot, and says, "I'll grow you one. I'll just take it back to lab and...1. use enzymes to break down the cell walls..."2. grow up a callus..."3. wait for somatic embryos to form..."4. culture an individual plantlet for you..."
Fill in the blank(s) with the appropriate word(s).