3 - organelles

Centrioles

Hollow cylinders made of ring of 9 protein mictrotubules

Help form spindle in nuclear division

Help with transport in cell cytoplasm

Every animal cell has one pair

Mitochondria

Site of later stages of aerobic respiration

Inner of 2 membranes golden, cristae = projections

Nucleus

Envelope of 2 membranes - nuclear pores

Has chromosomes and nucleolus

Chromosomes made of DNA have genes

Nucleolus

Dense body in nucleus

Ribosomes made here

Rough endoplasmic reticulum

Stacked, membrane-bound, flattened sacs

Ribosomes attached to outer surface

Proteins transported through

Ribsosomes

Made of RNA + protein

Found free in cytoplasm/attached to rER

Site of protein synthesis

Cell surface membrane

Phospholipid bilayer

Partially permeable barrier

Smooth endoplasmic reticulum

No attached ribosomes

Makes lipids + steroids (reproductive hormones)

Golgi apparatus

Stacked, membrane-bound, flattened sacs

Formed by fusion of vesicles from ER

Modifies proteins, packages for transport

Lysosomes

Sacs with digestive enzymes

Breakdown of unwanted structures in cell