Your lab group is experimenting with the diffusion of molecules across a membrane. Dialysis tubing is used as a model cell membr
ane 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 (on the left), but in the presence of starch, it turns a deep purple (right). 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. What CANNOT be concluded from the results? A) Iodine is a small molecule and diffused through the dialysis tubing INTO the starch solution. B) Starch is a large molecule and could NOT diffuse through the dialysis tubing into the iodine solution. C) Starch requires ATP energy for transport and therefore cannot cross the dialysis tubing into the iodine solution. Eliminate D) The starch solution is hypertonic to the iodine solution, causing water to move across the dialysis tubing INTO the starch solution.
E is a membrane protein that can be used for facilitated diffusion, in which large or charged molecules can move across the cell membrane. Facilitated diffusion is passive transport, meaning molecules diffuse from high to low concentration, without the need for ATP energy, using a transport protein. Only small, nonpolar molecules can diffuse through the phospholipid bilayer directly.
Chemical and mechanical digestion are the two methods your body uses to break down foods. Mechanical digestion involves physical movement to make foods smaller. Chemical digestion uses enzymes to break down food.
I had a long answer that I would have loved to share but I can't because brainly does not like the words using and there is no way around it, tried using every synonym on the internet... LOL sorry
Explanation: Instead of doing all of the experiments by yourself, you should ask other scientists for help, If you don’t, you would never know if they might get different results than you.
*Answer C makes more sense than the other answers.*
Answer: There is no diagram but I had this on a test last week. The answer is the gray and pink boats experienced the strongest force because they are both more massive than the orange boat, and they all changed speed by the same amount.
