chapter- 26.3 Flashcards
What are the three general requirements for multicellular organisms?
- cells must stick together
- must be able to communicate with each other
- must have interactions to aid cell division and differentiation
Why is cell adhesion important?
Cell adhension is important because when cells divide during mitosis/ meiosis they need to be able to stick together
How is adhesions accomplished in animal cells?
sheets of epithelial cells within animal cells house cadherin a transmembrane protein that joins adjacent molecules.
How does cell adhesion work in plant cells?
pectin which is polysaccharide adhere them together. There are no cadherin cells or integrin cells.
What organism has been tied to the origin of cell adhesion
Choanoflagellates, we know this to be true because they have cadherin and integrin proteins.
why did choanoflagellates need cell adhesion?
in order to stick on rocks are hard surfaces
in order to prey on bacteria cells and capture food
How does bacteria influence the life cycle of choanoflagellates?
Hypothesis: Bacteria triggers choanoflagellates to form a multicellular cell
Experiment:
petri dish had bacteria = multicellularity
petri dish no bacteria= no multicellarity
What organism has been tied to the origin of cell adhesion?
Choanoflagellates, we know this to be true because they have cadherin and integrin proteins.
in what ways cell communication important?
- sexual reproduction
- food access
- life
How do animal cells communicate with each other?
Through gap cells, gap cells are protein channels that allow ions and signaling molecules to move from one cell to another.
How do plant cells communicate with each other?
plants communicate through tiny holes with cytoplasm within the cell wall called plasmodesmata. They run from the cell wall to the ER
Cell development is a result of …
molecular communication between
cells
Hypothesis about why cells began to differentiate?
surface level cells were receiving oxygen and nutrients so they were not triggered to undergo mitosis while, inner cells that lacked nutrients were triggered into undergoing mitosis.
