Your lab group is experimenting with the diffusion of molecules across a membrane. dialysis tubing is used as a model cell membrane, because is it semi-permeable, allowing small molecules to cross the membrane, but not larger molecules, like starch. a starch solution is placed in the dialysis tubing and then the dialysis tubing is placed in an iodine and water solution. iodine is used as an indicator for the presence of starch. normally, iodine is a yellow-brown color, but in the presence of starch, it turns a deep purple. after observing the experimental setup for 20 minutes, the iodine solution remains brown, but the starch solution inside the dialysis tubing is purple and swollen. based on what you learned from the lab, starch is most likely to cross the cell membrane at which of the points indicated on the diagram? a) starch crosses the cell membrane at a. b) starch crosses the cell membrane at b. c) starch crosses the cell membrane at d. d) starch crosses the cell membrane at e.
fossil fuels and stuff like that
your answer should be lemon juice, but if i am wrong it could be sodium hydroxide, but i'm pretty sure its lemon juice. i hope this !
i would say that animals such as sea turtles and clown fish protect there offspring by putting them in areas that are much harder for predators to access. clown fish for example lay their eggs in the tentacles around a sea anemone to prevent predators from eating them because they are poisonous to all dish but clown fish. and sea turtles burry there eggs on land so that the predators cannot eat their eggs. hope this .