Model 2 Selectively Permeable Cell Membrane

Question: What two major types of biological molecules compose the majority of the cell membrane in Model 2?

Answer: Phospholipids and proteins

Question: How many different protein molecules are found in Model 2?

Answer: 2 protein molecules

Question: What is the difference between the position of the surface proteins and the membrane-spanning proteins?

Answer: Surface proteins do not reach across the membrane, while membrane spanning proteins do.

Question: When a carbohydrate is attached to a protein, what is the structure called?

Answer: Glycoprotein

Question: When a carbohydrate is attached to a phospholipid, what is the structure called?

Answer: Glycolipid

Question: What types of molecules are shown moving across the membrane?

Answer: Small polar and nonpolar molecules

Question: Where exactly in the membrane do these molecules pass through?

Answer: Between the phospholipid

Question: How does the concentration of the small molecules inside the cell compare to that outside the cell?

Answer: More smaller molecules are outside the cell composed to inside, so the concentration is higher outside compared to inside

Question: Homework Question: Because particles move randomly, molecules tend to move across the membrane in both directions. Does the model indicate that the molecules are moving in equal amounts in both directions? Justify your answer using complete sentences.

Answer: No, more molecules are moving into the cell compared to moving out of the cell. The arrows shows their movement.

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