The density of Douglas firs in an old-growth forest is estimated by counting the Douglas firs in four sample plots of 1 hectare each. The number of fir trees in the plots is 10, 12, 7, and 11, respectively. What is the estimated density of firs in the forest?
A) 2.5 trees per hectare
B) 5 trees per hectare
C) 10 trees per hectare
D) 20 trees per hectare
E) 25 trees per hectare
Answer: C) 10 trees per hectare
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A. freshwater B. marine C. soil D. All of the choices are correct.
The scientist who first determined the complete amino acid sequence of a protein (insulin) was
a. Christian Anfinsen. b. John Kendrew. c. Linus Pauling. d. Frederick Sanger.
Adaptive mechanisms, such as ____, can help animals live at a high elevation.
A. carbonic acid B. narrower blood vessels C. highly efficient hemoglobin–oxygen binding D. decreased nitric oxide E. small efficient lungs
Which of the following is true of allosteric enzymes?
A) Their activity can be increased by competitive inhibitors. B) Their activity can be reduced when the product binds the enzyme. C) Their coenzyme is removed when the product binds the enzyme. D) Their activity can be reduced when the substrate binds the enzyme.