Morphogenesis

Question 1

T or F : all cells have a surface tension at their membrane

Answer 1

TRUE

Question 2

Isolated cells adopt a spherical shape because of…

Answer 2

surface tension

Question 3

What drives cells to cohere? Why does this occur?

Answer 3

surface tension is what drives cells to cohere as a way to reduce their overall surface tension by reducing the amount of surface exposed

Question 4

Differences in cell adhesiveness in different tissues is known as…

Answer 4

sorting out

Question 5

____1.____ is the combined result of differences in ____2.____ and ____3.____ between cells of the different types

Answer 5

1. sorting out
2. adhesiveness
3. surface tension

Question 6

What are the three classes of adhesion molecules?

Answer 6

1. cadherins (calcium-dependent cell-cell adhesion)
2. immunoglobulin superfamily (calcium-independent cell-cell adhesion)
3. integrins (adhesion between a cell and its substratum)

Question 7

____1.____ are the adhesive components of cell junctions and about ___2.___ different types of cadherins have been identified in ____3.____

Answer 7

1. cadherins (calcium-dependent cell-cell adhesion)
2. 30
3. vertebrates

Question 8

T or F: When two cell lines with different amounts of N-cadherin on their surface are mixed, they re-assort with the cells containing the most N-cadherin ending up on the oustide

Answer 8

FALSE (inside instead of outside)