DNA molecules contain the genetic information that determines the characteristics of a living organism. How do DNA molecules express the genetic information they contain? OPTIONS:
- by breaking down proteins within the cell
- by directing the process of protein synthesis
- by regulating the storage of cellular proteins
- by controlling the movement of protein molecules
A: by directing the process of protein synthesis

The periodic table of the elements is systematically organized according to the OPTIONS:
- rate at which the elements chemically react.
- hardness of the elements.
- structure of the atoms of the elements.
- radioactivity of the atoms of the elements.
A: structure of the atoms of the elements.

Which interaction within an ecosystem is characterized by gradual change from one community of organisms to another? OPTIONS:
- symbiosis
- food webs
- energy pyramids
- succession
A: succession

The cell cycle describes the processes that take place as a cell OPTIONS:
- absorbs nutrients.
- makes proteins.
- repairs old cells.
- forms new cells.
A:
forms new cells.