Why do we learn about cells?
What do all cells have in common?
- Cell membrane
- Contain DNA
"Your body has something in the neighborhood of 40 trillion cells - quite a consulting committee. Call on it when you're confused or undecided. Relax quietly and ask your body what it has to say."
Prokaryotes vs. Eukaryotes
- a microscopic single-celled organism that has neither a distinct nucleus with a membrane nor other specialized organelles. Prokaryotes include the bacteria and cyanobacteria.
an organism consisting of a cell or cells in which the genetic material is DNA in the form of chromosomes contained within a distinct nucleus. Eukaryotes include all living organisms other than the eubacteria and archaebacteria.
How do eukaryotes and prokaryotes reproduce?
- The life of eukaryotic cells is characterized by a cell cycle with two major phases: the interphase and cell division. During the interphase, the cell takes in nutrients, grows, and duplicates its chromosomes.
- Prokaryotic cells reproduce by a process that is called binary fission. The DNA in such cells is contained in a single circular chromosome called a plasmid within the cytoplasm. The reproductive process starts with the replication of the chromosome.