The cell is highly organized with many functional units or organelles. Most of these units are limited by one or more membranes. Structure-Function Correlations Mitochondria are the cells' power sources. They are distinct organelles with two membranes. Usually they are rod-shaped, however they can be round.
Biology is the study of living organisms, which can become very complicated.
Fantastic resources for teachers, students, and parents. Inc. All rights reserved.