The important thing that connects plants is photosynthesis. Photosynthesis is a process that all plants have. This process allows plants to take in energy from the sun and turn it into sugars.

Cell Membrane: A thin layer that surrounds the cell. Cell Wall: A rigid layer that surrounds the cell membrane

of a plant cell. Chloroplast: A cell structure in which photosynthesis

takes place, and it contains the chlorophyll. Chlorophyll: A green substance in plant cells that helps to

make food. Cytoplasm: The jellylike liquid in cells where activities

take place. Nucleus: The dark structure inside the cell that controls

the cell's activities and contains material such as DNA.

• The most important organelle in an animal cell is normally the nucleus. The nucleus contains most of the genes that control the cell. The nuclear envelope encloses the nucleus, separating the contents from the cytoplasm.

• Ribosomes consist of two sub units and functioning as the site of protein synthesis in the cytoplasm.

• Endoplasmic reticulum makes up more then half the membrane of the cell. There are two different kinds of endoplasmic reticulum: smooth and rough. 

• Lysosomes are membrane-enclosed sac of hydrolytic enzymes that the cell uses to digest macromolecules.

• Peroxisome is a specialized metabolic compartment bounded by a single membrane. They contain enzymes that transfer hydrogen from various substrates to oxygen.

• Mitochondria are the organelles that convert energy to forms that cells can use for work. The energy factory of the cell.

• Nonmembrane organelles within the cells include microtubules and microfilaments. They form a framework called the cytoskeleton, which reinforces the cells shape and functions in cell movement.

• A special arrangement of microtubules is responsible for the eating of the flagella and cilia. Cilia normally occurs in large number on the cell surface. Flagella are the same length in diameter but longer.