#Question id: 24230
#Unit 4. Cell Communication and Cell Signaling
#Question id: 15338
#Unit 4. Cell Communication and Cell Signaling
#Question id: 14772
#Unit 13. Methods in Biology
#Question id: 3815
#Unit 3. Fundamental Processes
Use the figure to answer the following question. A space probe returns with a culture of a microorganism found on a distant planet. Analysis shows that it is a carbon-based life-form that has DNA. You grow the cells in 15N medium for several generations and then transfer them to 14N medium. Which pattern in the figure would you expect if the DNA was replicated in a conservative manner?
#Question id: 2223
#Unit 2. Cellular Organization
Five dialysis bags, constructed of a type of membrane that is permeable to water and impermeable to sucrose, were filled with various concentrations of sucrose and then placed in separate beakers containing an initial concentration of 0.6 M sucrose solution. At 10-minute intervals, the bags were massed (weighed), and the percent change in mass of each bag was graphed.
Which line in the graph represents the bag that contained a solution isotonic to the 0.6 M solution at the beginning of the experiment?