Question

Bodyl. 10AA ASEE T Autocate AD UNTS ABCDe AaBbCcDc Accod AaBb Adobe Afte A No Spacing Heading ing? The Suche lle Name (Type or Print) W Figure 5.4 Mass change (%) Five dialysis bags, constructed from a semipermeable membrane that is 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. Refer to Figure 5.4 to answer the following 10 20 30 40 50 60 question(s). Time (minutes) a. 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? A) A B) C) C D D E) E OTYYTY b. Which line in the graph represents the bag with the highest initial concentration of sucrose? A) A B) C) C D) DE ) E c. Which line or lines in the graph in the figure represent(s) bags that contain a solution that is hypertonic at 50 minutes? A) A and B B) B C) C D ) D E ) D and E 9. The ratios of saturated to unsaturated phospholipids in an organism's membranes can change in response to changes in environmental conditions. a. How do the properties of a membrane that contains a low percentage of unsaturated phospholipids compare with those of a membrane that contains a high percentage of unsaturated phospholipids?

Answer 1

C LUDONO Ans- (a) - () C Explanation - line c represents no change in mass of bag from begining to the end of the experiment. which shows that no net loss or gain of mass took place across the semipermeable membrane. This can happen only in isotonic solution case Ans-(b) : A) A Explanation line A represents that highest gain of mass took place. It clearly indicates that highest amount of water was transferred from solution to bag. And thus, it is clear that highest initial concentration of sucrose was there in case the bag in case of line A Ans-(e) a BB Explanation line B represents that bag is in hypertonic at 50 minutes. As it is showing a continuous decrease in the bay solution mass. Unlike D and E where line became constant, ore re showed decrease in mass, or c, where no change in Solution mass took place line A showed that after 40 minutes solution became isotonic. But line B represents continuous increase in solution mass of bag solution. Ans. 9. (a) A membrane which contains higher percentage of unsaturated phospholipids will have higher membrane fluidity than a membrane with lower percentage of unsaturated phospholipids. Explanation: The unsaturated phospholipid contain double bond thus i m g { "kink" is formed in the phospholipids. saturated phospholipid This kink hinders the stacking of am m a kink Phospholipids and thus enhance the unsaturated phospholipid membrane fluidity. increase