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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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.
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
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.