Full induction of the lactose operon requires
A. lactose present.
B. lactose and glucose present.
C. lactose and arabinose present.
D. lactose present without glucose.
Answer: D
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Which of the following factors has delayed the development of laboratory-based genetic systems in Archaea?
A) There are no documented systems of conjugation in Archaea. B) Homologous recombination does NOT occur in Archaea. C) Archaea do NOT host viruses or plasmids. D) Many archaea grow in extreme or unusual conditions that make the use of agar and traditional mutant screening techniques problematic.
You are taking a lab practical exam. One station has a microscope slide of a cross section through an artery and vein. Which vessel is the artery?
A. the vessel with more muscle tissue and elastic fibers in its wall B. the vessel with valves to prevent backflow C. the vessel lined only with endothelium D. the vessel with a greater overall diameter E. the vessel with the wider lumen (e.g., interior space that contains the blood)
Which is an accurate description of organelle genomes? (Select all that apply.)
A) Translation in mitochondria and chloroplasts is often inhibited by bacterial antibiotics (e.g., chloramphenicol). B) Like bacteria, mitochondria use N-formyl methionine and tRNAfmet in translation. C) mtDNA and cpDNA are usually organized into nucleosomes by histones. D) Like bacterial genes, mitochondrial and chloroplast genes do not have introns. E) Like bacterial genomes, mitochondrial and chloroplast genomes in all species consist of one circular DNA molecule.
One of the unexpected findings to occur in comparing the mouse and human genomes is
A. that junk DNA is a complex mechanism of regulation. B. how similar some gene families are to their original transposons. C. that there is far more junk DNA than we ever thought. D. how incredibly different they are.