Since the Industrial Revolution, the pH of the oceans has __________, making the water more
__________.
a. decreased; acidic
b. decreased; basic
c. increased; acidic
d. increased; basic
A
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Cross-bridges form between the contractile proteins of the muscle cell. The movement of cross-bridges shortens the muscle fiber. What two proteins participate in cross-bridge formation?
A. actin and myosin B. troponin and titin C. titin and myosin D. titin and actin
Which sentence best describes diatoms?
a. They are unicellular and autotrophic. b. They are multicellular and heterotrophic. c. They are unicellular and heterotrophic. d. They are multicellular and parasitic.
Staining is an important part of smear preparation for microscopic viewing. Which of the following staining procedures uses more than one stain?
A. Capsule stain B. All of the above C. Spore stain D. Staining for Tuberculosis agent
What is required if a researcher wants to analyze homologous genes in different species?
A. relatively long DNA sequences B. relatively short RNA sequences C. relatively short DNA sequences D. relative differences in the species' metabolisms. E. relatively short polypeptide sequences