All animals perceive light using different forms of a pigment called retinal
Indicate whether the statement is true or false.
ANSWER: True
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The Fc region on IgG
A. interacts with complement. B. attaches to receptors on macrophages. C. reacts with and coats the antigen. D. contains a variable region. E. interacts with complement AND attaches to receptors on macrophages.
Exchange of genetic material among different species is called
A. homolgous gene exchange. B. horizontal gene transfer. C. exon shuffling. D. genetic recombination. E. exon shuffling and or genetic recombination.
Like bacteria, yeasts grow easily in culture. But why are they regarded as more useful for recombinant DNA technology?
a. They are more stable in culture than prokaryotes because they are not prone to bacteriophages. b. They are virtually harmless to humans so they are less risky to work with than prokaryotes. c. Because yeasts are eukaryotic, they exhibit post-transcriptional mRNA editing not performed by any prokaryotes such as Escherichia coli. d. They have longer lifespans so they do not have to be split and recultured as often.
The Mars expeditions are looking for life in which of
the following? a. air b. rock c. water d. subsurface soil e. archeological sites