Which is a component of the modern cell theory that was not part of the original cell theory? all organisms are made of cells. all cells are similar in composition and metabolic activities. all cells come from preexisting cells. a cell is the basic unit of structure and function for all living things.

The second statement is not part of the original cell theory.

Explanation:

The cell theory was presented by Schwann and Schleiden. Rudolf Virchow also contributed to the theory. there were three component of this theory originally-

All living beings are made up of 1 or more cells.

Cells form from already existing cells.

The cell is the fundamental unit of structure, function, and organization in organisms.

Thus, the second statement is not part of the original component of the cell theory.

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.