A substance consists of weak acids or bases designed to maintain a specific pH of a solution within a cell or a biological system. Which of the following describes this substance?
A) buffer
B) catalyst
C) pH
D) acids
A
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The primary root of a seedling grows down
a. to avoid light. b. in response to gravity. c. because the cells on the upper surface of the root elongate more rapidly than those on the lower surface of the root. d. in response to different concentrations of auxin. e. because of all of these except "to avoid light."
The research of which of the following scientists showed that genetic disorders and abnormal
metabolism are related? A. Sir Archibald Garrod B. Francis Crick C. Linus Pauling D. Linda Bartoshuk E. James Neel
Harmful introduced species usually come into an area by:
a. human beings. b. the species themselves. c. hurricanes. d. floods. e. parasites.
Photosynthetic organisms capture energy from sunlight and convert it into chemical bonds by forming
a. sugars. b. enzymes. c. work. d. substrates.