What is the role a species plays in an ecosystem?
A) ecological niche
B) trophic level
C) biophilia
D) biomass
A
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How does current theory explain the origin of a nucleus in eukaryotic cells?
A. A prokaryotic cell was engulfed by another cell and became specialized in DNA replication. B. A prokaryotic cell was engulfed by another cell and became specialized in DNA transcription. C. A prokaryotic cell was engulfed by another cell and became specialized in translation. D. There is no current theory that explains the origin of the nucleus. E. None of the answers options is correct.
Once integrated, phage DNA can remain in the prophage state as long as
A. the bacteria is frequently plated on new media. B. certain phage genes are excised. C. certain phage genes are repressed. D. bacterial repressor genes are activated.
The example of agarose displayed is composed of two chains coiled around each other in a helical (spiral) fashion. Agarose molecules are generally composed of hundreds of sugar residues. Approximately how many residues are in each of the chains?
a. 2 b. 4 c. 6 d. 8
T cell response to T-dependent antigens requires
A. binding of the T cell to a class II MHC receptor on a macrophage. B. typically a protein antigen. C. binding of the T cell to a site on the antigen. D. interleukin-1 activating the T helper cell. E. All of the choices are correct.