Enzymes are
(a) biological catalysts.
(b) agents that speed up cellular reactions.
(c) proteins.
(d) all of the above.
(d) all of the above.
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What is the pH of a solution with a hydroxyl ion (OH-) concentration of 10-12 M?
A) pH 2 B) pH 4 C) pH 10 D) pH 12 E) pH 14
Which of the following is not an advantage of a transgenic plant?
A. Widely accepted by the public B. Increased resistance to disease and pests C. Adaptability to harsh environments D. Improved shelf life
Most animal lineages evolved during the ___
period.
a. Cretaceous b. Devonian c. Ordovician d. Silurian e. Cambrian
Which of the following statements about paracrine regulation is TRUE?
a. The hormones released only stimulate the cells that secreted them. b. The hormones released only inhibit the cells that secreted them. c. The hormones released act on nearby target cells. d. The hormones released are transported down axons. e. The hormones released link the endocrine and nervous systems.