Cell attachments

Question 1

3 basic molecular attachments

Answer 1

1. adhesion molecules - integral glycoproteins
2. cytoskeletal filaments - anchor adhesion molecule
3. intracellular attachment proteins - link adhesions to cytoskeleton

Question 2

define cell junct.

Answer 2

large numbers of attachment proteins together

Question 3

2 methods of anchoring cells to each other

Answer 3

1. adherens jcts

2. desmosomes

Question 4

2 types of adherens jcts.

Answer 4

1. fascia adherens - focal sites

2. zonula adherens - belt-like around whole cell

Question 5

2 types of attachments to extra-cell matrix

Answer 5

1. focal contacts

2. hemidesmosomes - anchor cell to basement membrane

Question 6

2 types of non-anchoring attachments

Answer 6

1. tight junctions

2. gap junctions

Question 7

Feat. of tight JCTs

Answer 7

• surround cell
• seal spaces between cells - internal surfaces
• organize cell membrane

Question 8

Feat. of gap JCTs

Answer 8

• tiny channels between cells
• allows minimal tranfers
• made up with 6 spiralled connexon