Cells are characterized by
A) an aggregation of proteins.
B) the synthesis of proteins with stable shapes.
C) the enclosure of biological molecules by a membrane.
D) complex proteins being dissolved in water.
E) the formation of reactants and products.

Question

Quizplus · Accepted Answer

Cells are characterized by having a boundary or membrane that separates the interior from the exterior. This enclosure allows for the concentration of particular molecules and for specialized functions to be carried out within the cell.

Option A is not correct because although proteins are present in cells, they are not the defining characteristic.
 
Option B is not correct because although proteins may fold into stable shapes, this is not a defining characteristic of a cell. 
 
Option D is not correct because complex proteins are not dissolved in water, but rather they are folded into specific shapes as mentioned earlier. 
 
Option E is not correct because although reactions may occur within a cell, it is not the defining characteristic of a cell.

Cells Are Characterized by