1. KEY WORDS: cell, cell membrane, prokaryote, eukaryote, organelles.
CELL BIOLOGY
KEY WORDS: cell, cell membrane, prokaryote, eukaryote, organelles.

2. What defines a cell?
Trees in a forest, whales in the ocean, ants in your garden, algae in a pond, bacteria in the soil --- all these organism are made of building blocks we call cells.
Within an organism, cells can be surprisingly different in shape and function.
Can you name different types of cells found in your body?

4. Cells are considered the basic unit of life.
They come in discrete and easily recognizable packages, that is because all cells are surrounded by a structure called cell membrane. This structure separates the cell’s internal and external environments.
Why is it important to separate inside from outside?

5. What are the different categories of cells?
Rather than grouping cells by their size or shape, scientists typically categorize them by their complexity.
Can you tell the differences and similarities between the following cells?

6. If the DNA within a cell is not separated from the cytoplasm, then that cell is a prokaryote. In prokaryotes, DNA is a single loop. This cells are simple, with no membrane-encased organelles.
Most prokaryotes are made up of just a single cell (unicellular) and are divided into two groups: Bacteria and Archaea.

7. In eukaryotes, DNA is organized into chromosomes and enclosed within a structure called nucleus. They posses membrane-bound organelles. Eukaryotic organisms may be multicellular or single-celled organisms. All animals are eukaryotes. Other eukaryotes include plants, fungi, and protists.

8. How do cells accomplish all their functions in such a tiny, crowded package?
Eukaryotic cells have evolved ways to partition off different functions to various locations in the cell. In fact, specialized compartments called organelles exist within eukaryotic cells for this purpose.

9. Differences between eukaryote cells
Can you tell which are the differences between these two cell types?
Differences between eukaryote cells