HELP! EASY! What is the purpose of the plasma membrane? HURRY! LOTS OF POINTS! Makes food for the cell.

Encloses specific structures.

Keeps the cell small.

Reproduces cells.

What does gradualism and punctuated equilibrium have in common

With regard to enzymes, key is to lock as a) substrate is to activation energy eliminate b) product is to substrate. c) enzyme is to active site. d) substrate is to active site.

Once an egg cell is fertilized by sperm, the cell then, as the embryo develops, it receives nourishment and eliminates wastes by transferring substances from its blood to its mother's blood. a. becomes a fetus immediately and exits the womb b. begins to divide and implants itself in the wall of the uterus c. remains in the uterus without dividing for several months d. travels back to the ovaries until the fetus is developed