Question

1. Describe the different Cell Junctions in Animal cells.
2. What is the only Cell Junction in Plant cells? Why do Plant cells only have one type of Cell Junction?
3. Explain Cell-Cell signaling involving Signal Transduction and G-Proteins.

Answer 1

Question 1:

Answer: Cell junctions are the structures where long terms association between neighboring cells is established.

There are three types of cell junctions in animal cells. They are:

1. Tight junctions: The membranes of the neighboring cells in the tight junctions are pressed together which prevents the leakage of extracellular fluid by the binding plasma membrane of neighboring cells together.

2. Desmosomes(anchoring junctions): They fasten the cell together into a strong sheet. The intermediate filaments "sew" membranes together.

3. Gap junctions: They are one form of communicating junctions that provides cytoplasmic channels between adjacent cells.