A bowl of sugar water is very stable. However, cells can rapidly break down sugar into carbon dioxide and water. What is the best explanation for this observation?
A. Glucose becomes more chemically reactive inside a cell.
B. The water is activated by the presence of living cells.
C. Enzymes in the cell catalyze the breakdown of glucose.
D. Living cells make the water warmer, speeding up the reaction.
E. Breakdown of glucose has a negative delta G outside of cells, but a positive delta G inside cells.
F. Cells use energy to break down glucose.
C. Enzymes in the cell catalyze the breakdown of glucose.
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The Emerson enhancement effect
A) was proposed by Robert Emerson in the 1980s. B) states that there are three or four separate photoreactions. C) is a synergistic phenomenon. D) is the result of two distinct photosystems. E) both choices C and D
Mangroves encourage the erosion of soils on coastlines
Indicate whether the statement is true or false.
You have discovered a previously unidentified plant, and you cultivate it in your lab. You notice that its flowers close when people are talking, yet are open when the lab is relatively quiet
You suspect that this plant may have the ability to hear! Which of the following hypotheses is (are) the most reasonable to explain this phenomenon? I) There is a cell-surface protein on the epidermal cells that becomes phosphorylated in response to vibration by sound waves. II) There are tiny hairs on epidermal cells that bend in response to the vibration of sound waves, triggering an action potential in epidermal cells. III) There is a cell-surface receptor on root cells that becomes phosphorylated when the soil vibrates in response to sound waves. A) only I B) only II C) only III D) I, II, and III
A plasmid that has genes for resistance to two antibiotics, tetracycline and ampicillin, is cut with the restriction enzyme BamHI. BamHI cuts within the ampicillin resistance gene. Caenorhabditis elegans DNA that has been cut with BamHI is ligated into the linearized plasmid to make a genomic DNA library. The mixture is transformed into E. coli. Which antibiotic should be added to the medium to select cells that contain the recombinant plasmid?
A. ampicillin B. neither ampicillin or tetracycline C. tetracycline D. ampicillin and tetracycline E. x-gal