Which category of organic macromolecule allows myelinated sheaths to act as electrical insulators?
a. proteins
b. carbohydrates
c. lipids
d. RNA
e. DNA
ANSWER: c
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What happens to the alpha subunit of a G protein with GDP attached?
A. It re-assembles with the beta and gamma subunits. B. It no longer activates an effector protein. C. It re-associates with the G protein-coupled receptor. D. All of these answer options are correct.
The chemolithotrophs that metabolize reduced sulfur compounds using oxygen as a terminal electron acceptor in the Winogradsky column include ________.
A. cyanobacteria B. Chromatium C. Desulfovibrio D. Beggiatoa
All of the following are reasons why some scientists believe that the term "prokaryote" is a somewhat artificial designation and should be discarded except
A. Some bacteria have 80S ribosomes. B. Some bacteria have their genetic material enclosed within a membrane. C. Some bacteria have internal membranous structures. D. Many bacterial have cytoskeletal elements.
Consumers of fish and fish products can promote sustainable fisheries by
a. purchasing fish at the lowest cost. b. not buying monkfish, orange roughy, and Atlantic salmon. c. making wise purchasing decisions. d. both b and c