Question

1 multiple answer 1 point which of the following are necessary for a dialysis experiment? (select all that apply) a semipermeable membrane a container to hold the solutions a source of energy solutions with different - sized molecules 2 multiple choice 1 point which type of molecule is most likely to pass through a dialysis membrane during an experiment? small molecules like glucose proteins lipids large molecules like starch 3 multiple choice 1 point which of the following is an example of diffusion? a cell absorbing nutrients via active transport oxygen moving from the blood into body tissues large molecules moving across a dialysis membrane water moving through a plant’s roots

Explanation:

1. Dialysis is a process that separates substances in solution by the difference in their rates of diffusion through a semi - permeable membrane. A semi - permeable membrane is essential to allow selective passage of molecules, and a container is needed to hold the solutions. Energy is not required as it is a passive process, and solutions with different - sized molecules are used to demonstrate the separation ability of the membrane.
2. Small molecules like glucose can pass through a dialysis membrane due to its pore size, while larger molecules like proteins, lipids, and starch are generally retained.
3. Diffusion is the movement of a substance from an area of high concentration to an area of low concentration. Oxygen moving from the blood (higher concentration) into body tissues (lower concentration) is an example of diffusion. Active transport in cells requires energy and is not diffusion. Large molecules do not easily diffuse across a dialysis membrane, and water movement through a plant's roots is mainly due to osmosis.

Answer:

1. A. A semipermeable membrane, B. A container to hold the solutions, D. Solutions with different - sized molecules
2. A. Small molecules like glucose
3. B. Oxygen moving from the blood into body tissues