Measurements show that the pH of a particular lake is 4.0. What is the hydrogen ion concentration of the lake?
A) 4.0 M
B) 10-10 M
C) 10-4 M
D) 104 M
Ans: C) 10-4 M
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Which of the following enzymes and their functions is mismatched
A. Helicase-unwinds the supercoiled DNA B. DNA ligase--joins nucleic acids together C. DNA polymerase-removes bases from DNA D. RNA polymerase-synthesizes primer E. RNA polymerase-synthesizes okazaki fragments
The enzyme salivary amylase in the mouth breaks down starch into the simple sugar glucose. The mouth has a pH of 7. Salivary amylase will
A. also break down starch in the stomach, which has a pH of 2. B. be able to break down proteins to amino acids in the stomach. C. be able to break down starch in a test tube. It doesn't need to be in the mouth. D. only work at body temperature.
Temperate deciduous forests are characterized by
A. the highest variation in day and night length. B. dry climates with rainfall averages around 25-75 cm. per year. C. the highest amount of organisms living in the tree canopy. D. a growing season that ranges between 140 and 300 days. E. the richest topsoil horizon.
An amino acid contains all of the following except
A. a carbon atom. B. an amino group. C. a carboxyl group. D. a variable R group. E. a nitrogenous base.