When ________ and ________ are broken down excess nitrogen is released that must be eliminated by the excretory system.
A. proteins; salts
B. glucose; fatty acids
C. nucleic acids; sulfur
D. amino acids; nucleic acids
Answer: D
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Organisms that grow in the mud under relatively nonturbulent bodies of water are likely to be
A. obligate aerobes. B. thermophilic. C. anaerobes. D. barophilic.
What is unusual about phage MS2 infection of Escherichia coli?
A) All proteins are synthesized simultaneously during infection so there are no early and late proteins. B) It attaches to the host's pilus rather than the cell's surface. C) It enters through a host cell porin. D) More than one MS2 phage can be present in an individual E. coli cell.
An organism classified as a eukaryote could be which of the following?
A. a photoautotroph or a photoheterotroph B. a chemoheterotroph or a photoautotroph C. a photoheterotroph or a chemoheterotroph D. a chemoautotroph or a chemoheterotroph
Rho GTPases have the all of the following effects on cytoskeletal actin except
A) stress fiber formation. B) formation of pseudopodia. C) stabilization of neurons. D) assembly of the cytokinetic furrow. E) regulation of endocytosis and exocytosis.