KEY TAKEAWAYS •
There are fundamental differences between prokaryotic cells and eukaryotic cells, with eukaryotic cells having membrane-bound organelles.
•
Organelles in the eukaryote can be double-membrane bound or single-membrane bound. The nucleus, mitochondria, and chloroplasts have two membranes.
•
There are differences between plant cells and animal cells, including the presence of cell walls, chloroplasts, and central vacuoles in plant cells.
•
Cells communicate through short or long distances, setting up signaling pathways that change the activity of the cell.
•
The main tissue types in humans are epithelial tissue, connective tissue, nervous tissue, and muscle tissue.
44