What is meant by the following statement about the cell membrane? The cell membrane is said to be semipermeable.
O A. It will not allow any molecules to pass through.
oso
O B. It does not contain any membrane proteins.
O C. It is very selective about what it allows to pass through.
D. It allows all polar molecules into the cell.

Common commercial benefits of microorganisms include synthesis ofa. insulin. b. antibiotics. c. aspirin. d. antibiotics and aspirin. e. antibiotics and insulin.

Molecular models of two different substances are shown below. in the molecule on the left, the oxygen atom pulls on electrons more strongly than the hydrogen atoms. in the molecule on the right, the two oxygen atoms pull on the shared electrons with the same strength. water molecule, h, o oxygen molecule, oz when the two substances are put in the same container, they do not attract each other. why does this happen? a. they both contain oxygen. b. one is polar and one is nonpolar. c . they are both polar. d. they contain different elements.

The breakdown of food is accomplished by enzymes. a. physical b. chemical c. mechanical d. none of the above