The substance that an enzyme combines with is
(a) another enzyme.
(b) a product.
(c) an active site.
(d) the substrate.
(d) the substrate.
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Which immune cells can kill cancerous cells that lack MHC markers?
a. effector B cells b. cytotoxic T cells c. natural killer cells d. both cytotoxic T cells and natural killer cells e. all of these
Which term refers to animals that do NOT have a body cavity that separates the gut from the muscles of the body wall?
a. indeterminate b. acoelomate c. pseudocoelomate d. mesenteries
Information from experiments is considered valid if
A. the same results are obtained each time the experiment is performed. B. the results were predicted by the hypothesis. C. the same results are obtained by several scientists. D. All of these statements are true.
Assume the Na+ is being transported across a membrane via facilitated diffusion. Which of the following conditions would allow for the most transport of Na+ across the membrane?