Clostridium botulinum produces a deadly toxin that stops muscle contractions by
a. destroying cell membranes.
b. killing mitochondria.
c. disrupting the structure of actin filaments.
d. preventing ATP synthesis.
e. blocking acetylcholine release.
E
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When the substrate is bound to the enzyme, the shape of the enzyme may change slightly, leading to
A. an induced fit B. a great range of possible catalytic activities C. a greater supply of activation energy D. more permanent binding through intimate total contact E. more possible products of the reaction
Which one of the following is an advantage of using the fossil record to obtain information about our evolutionary history?
A. The fossil record gives us examples of the intermediate stages of evolution B. There is no advantage that the fossil record provides that DNA analysis doesn't also provide. C. The fossil record gives us the information necessary to define species. D. The fossil record gives us the information needed to confirm that the Neanderthals were the first bipedal humans.
Drug therapies that target only cancer cells rather than all dividing cells in the body stop the growth of cancer by blocking the action of ____________________ proteins on the growth and division on malignant cells
Fill in the blank(s) with correct word
The major source of diversity for B and T cell receptors is
a. mitosis. b. meiosis. c. transcript processing. d. random recombination of gene segments. e. mutation.