Indicate whether each of the following molecules cross the plasma membrane by si
ID: 92533 • Letter: I
Question
Indicate whether each of the following molecules cross the plasma membrane by simple diffusion or by facilitated diffusion and why you answered as you did. O_2 (oxygen gas) crosses the plasma membrane by _________ diffusion, because __________ Glucose crosses the plasma membrane by ________ diffusion, because _______ Water crosses the plasma membrane by _________ diffusion, because __________ Na+ (sodium ion) crosses the plasma membrane by ________ diffusion, because ___________ Cholesterol (a lipid) crosses the plasma membrane by ________ diffusion because __________ Which molecule above cannot diffuse through the pores of dialysis tubing?Explanation / Answer
1) O2 by simple diffusion because of concentration gradient across the plasma membrane.
2) glucose by facilitated diffusion through glucose channels because of concentration gradient across the plasma membrane and non-polar molecule.
3) water by facilitated diffusion through aquaporin channels because of concentration gradient across the plasma membrane and polar.
4) Na+ by facilitated diffusion through channels because of concentration gradient across the plasma membrane and polar molecule.
5) cholesterol by facilitated diffusion through GPI-anchored protein
6) cholesterol cannot diffuse through the pores of dialysis tubing