How did Renato Dulbecco determine that the repair of UV damage could be increased by exposure to visible light?
What will be an ideal response?
T phage DNA was irradiated with UV light, which decreased its viability in E. coli. Subsequent exposure of the phage to visible light had no photoreversal effect; however, when the UV-irradiated phage was inside E. coli cells and then exposed to visible light, repair in the form of increased phage viability was observed.
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When does a species become classified as endangered?
a. when less than 100 remain b. when less than 500 remain c. when less than 1000 remain d. There are no definitive guidelines for classifying a species as endangered
Secondary endosymbiosis occurs when a ____ eukaryote engulfs a ____
a. photosynthetic; photosynthetic prokaryote b. photosynthetic; non-photosynthetic prokaryote c. photosynthetic; non-photosynthetic eukaryote d. non-photosynthetic; photosynthetic prokaryote e. non-photosynthetic; photosynthetic eukaryote
If the hydrogen atoms of water are radioactively labeled, which products of photosynthesis, if any, will
also have this radio-labeled hydrogen?
a. water and oxygen gas both b. water only c. sugar only d. water and sugar both e. water, sugar, and oxygen gas
Which of the above diagrams represents a junction
which will allow ions to move between adjacent cells? a. A b. B c. C d. all of these e. none of these