Question

Molecules A and B come in contact with the cell membrane of the same cell. Molecule A passes through the membrane readily, but molecule B does not. Which statement could describe molecules A and B?a. Molecule A is a protein, and molecule B is a fat.b. Molecule A is a starch, and molecule B is a simple sugar.c. Molecule A is an amino acid, and molecule B is a simple sugar.d. Molecule A is a simple sugar, and molecule B is a starch.

Answer 1

Answer is D. Molecule A is a simple sugar and molecule B is a starch.

Step-by-step explanation:

Cell membrane is considered or described to be selectively permeable, this is because it controls the type of substances that can pass through it.

Note that, substances like simple sugar and amino acid can easily or are allow to pass through the cell membrane because they are made up of small molecules, while substances like protein and starch can not pass through the cell membrane because they are made up of large molecules.