Which of the following statements regarding enzymes is TRUE?
A. Enzymes decrease the free energy change of a reaction.
B. Enzymes increase the rate of a reaction.
C. Enzymes change the direction of chemical reactions.
D. Enzymes are permanently altered by the reactions they catalyze.
E. Enzymes prevent changes in substrate concentrations.
B. Enzymes increase the rate of a reaction.
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If scientists want to develop plants better adapted to certain climates they need information about the plant's ability to:
A. bind membrane proteins B. transport solutes passively C. make dehydrins D. take up minerals E. transport calcium
A human population living without medical care in a developing country would probably have ____
a. a rectangle-shaped age structure diagram b. an r value < 0 c. a pyramid-shaped age structure diagram d. per capita birth and death rates consistent with those of a stage 4 society e. no density dependent factors operating
Monoclonal antibodies may be used to
a. treat mononucleosis. b. screen for prostate cancer. c. produce genetically modified bacteria. d. clone interferons. e. treat infected lab mice.
One generalization of the cell theory is that ____.
A. all cells have a nucleus B. all cells have cell walls C. the cell is the smallest unit that displays the properties of life D. cells can arise from nonliving matter E. all cells are microscopic