Outer boundary of the cell, which regulates what enters and exits the cell. It is selectively permeable. Cell membrane

This is the jelly-like fluid matrix within the cell Cytoplasm

The organelle that releases energy from stored food molecules mitochondrion

Site of protein synthesis (where proteins are made) Ribosome

Structures within the cell that perform specialized functions organelles

Controls all cell activities, especially growth and reproduction nucleus

Porous double membrane that separates the nucleus from the cytoplasm Nuclear envelope

Network of protein filaments that helps the cell to maintain its shape cytoskeleton

Genetic material that is found in the nucleus of a nondividing cell Chromatin

Compact form of DNA and protein in the nucleus of a cell about to divide Chromosome

Rough endoplasmic reticulum Set of tubular passageways involved with the transport of proteins; it has many ribosomes attached and connects the nucleus to the cell membrane Rough endoplasmic reticulum

Non-living layer that surrounds a plant cell and provides protection and support Cell wall

Tubular structures found only in animal cells that are involved in cell division Centrioles

Storage sacs that store food, water, salts and other materials Vacuoles

Stack of flattened membranes that processes and packages proteins to be secreted out of the cell Golgi apparatus

Organelles that contain powerful digestive enzymes that break down substances to be used by the cell as well as toxic materials Lysosome

Site of photosynthesis in the plant cell Chloroplast

Smooth endoplasmic reticulum Tubular passageways that have few or no ribosomes attached and is the site of lipid synthesis Smooth endoplasmic reticulum

Tail-like structure found in prokaryotes and some animal cells; used for cell movement flagella