The two original components of cell theory are that all life is made of cells and that cells are the fundamental unit of life. A third component added soon after the original formulation of the theory, is that all cells come from pre-existing cells. More recently, cell theory incorporated the ideas that all cells have the same basic chemical composition, use energy, and contain DNA that is duplicated and passed on as each cell divides.5. Which molecules and structures occur in all cells?6. Describe adaptations that increase the ratio of surface area to volume in cells.
1.How do prokaryotic cells differ from eukaryotic cells? 2.Compare and contrast bacteria and archaea. Bacteria and archaea are small, single celled organisms that lack nuclei and membrane-bounded organelles. The two groups differ in the composition of the cell wall, cell membrane and flagella; they also differ in the key DNA sequences.3.What is the relationship between cells and organelles?Eukaryotic cells contain specialized membrane-bounded organelles that carry out specific functions.Mastering Concepts: Section 3.31. Chemically, how is a phospholipid different from a triglyceride?A phospholipid has two fatty acids and a phosphate group attached to a glycerol, whereas a triglyceride has three fatty acids attached to a glycerol.2. How does the chemical structure of phospholipids enable them to form a bilayer in water?3. Where in the cell do phospholipid bilayers occur?4. What are some functions of membrane proteins?1.How do organelles contribute to efficiency in eukaryotic cells?
Organelles concentrate the biochemicals needed for chemical reactions so that the reactions proceed more rapidly. Also, because of organelles, a eukaryotic cell can maintain high