CH. 22

The units of structure and function of living things

The study of cells

What states that all living things are com-posed of living units called cells and of cell products and that all cells come only from preexisting cells?

What work do cells do?

The size of an organism depends on what?

As anything grows, its __________ increases faster than its ____________.

What is the cell primarily composed of?

Other major substances in the cell

Biologists recognize three main parts of every eukaryotic cell

The outer boundary layer that separates the cell from its environment and controls what enters and leaves the cell

What consists of the many molecules and organelles the cell contains and the fluid medium around them?

A spherical body, often located near the center of the cell, that contains the genetic material of the cell and serves as the cell’s master control center?

Little organs

A very thin, flexible barrier that separates the contents of human and animal cells from the outside environment.

Special lipid molecules

Two-layered structure formed by clusters of phospholipid molecules.

Network of flexible reinforcement fibers beneath the phospholipid bilayer of the cell membrane.

Plant cells manufacture a rigid, box-like structure called the ________________.

The working area of the cell

The jelly-like fluid medium of the cell.

Most of the activities of life occur within the ______________________ and _____________________

Large protein catalysts