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## Nucleus - **Nuclear envelope:** membrane enclosing the nucleus. Protein-lined pores allow material to move in and out. - **Chromatin:** DNA plus associated proteins - **Nucleolus:** condensed region where ribosomes are formed. - **Peroxisome:** metabolizes waste. - **Endoplasmic reticulum** -...

## Nucleus - **Nuclear envelope:** membrane enclosing the nucleus. Protein-lined pores allow material to move in and out. - **Chromatin:** DNA plus associated proteins - **Nucleolus:** condensed region where ribosomes are formed. - **Peroxisome:** metabolizes waste. - **Endoplasmic reticulum** - **Rough:** associated with ribosomes; makes secretory and membrane proteins. - **Smooth:** makes lipids. ## Cytoplasm - **Cytoskeleton** - **Microtubules:** form the mitotic spindle and maintain cell shape. - **Centrosome:** microtubule-organizing center. - **Intermediate filaments:** fibrous proteins that hold organelles in place. - **Microfilaments:** fibrous proteins; form the cellular cortex. - **Plasma membrane** - **Lysosome:** digests food and waste materials. - **Golgi apparatus:** modifies proteins. - **Vacuole** - **Mitochondria:** produce energy.