Unit 2 - Cell Interactions - Mar 13

Question 1

Basement Membrane (basal lamina)

Answer 1

most abundant of animal cell ECM which underlies (under) epithelial tissue

Question 2

Extracellular Matrix (ECM) and order(top-bot)?

Answer 2

Material produced by cells that becomes a non-living part of the surrounding tissue, influences cell shape and gene expression. (Essentially what’s left over after you decellularize a tissue)
1.Epithelial tissue
2.connective tissue

Question 3

Interstitial matrix of connective tissue

Answer 3

underlies basement membrane and makes up bulk of connective tissue

Question 4

What is the Skin?

Answer 4

community of cells containing 2 main layers: the epidermis and dermis (beneath)

Question 5

The Epidermis

Answer 5

several layers thick and is an epithelial tissue, mainly keratinocytes but also melanocytes

Question 6

The Dermis

Answer 6

1. made of connective tissue
2. contains nerve endings and blood vessels
3. is strong and flexible
4. consists of mostly fibroblasts which synthesize extracellular matrix and repair wounds

Question 7

Connective Tissue

Answer 7

a tissue type characterized by few cells and substantial amounts of extracellular matrix (ECM)

Question 8

Epithelial Cells

Answer 8

cells arranged in 1+ layers and create epithelial tissue

Question 9

Integrins

Answer 9

integral membrane proteins that help cells actively adhere to ECM

Question 10

Cadherin

Answer 10

integral membrane protein that help cells adhere to one another

Question 11

Cell-cell interaction purposes by Junctional Complexes

Answer 11

macromolecular, mediates cell-cell interactions’ many purposes which include Adhesion Junctions, Occluding Junctions, Channel-Forming Junctions.

Question 12

Adhesion Junctions

Answer 12

cells stick to one another and to ECM to form tissue

Question 13

Occluding Junctions

Answer 13

prevent passage of hydrophilic solutes from one side of cell layer to other

Question 14

Channel Forming Junctions

Answer 14

sharing small molecules in cytosol; makes cell signaling faster for temporary tissue cell activity coordination

Question 15

Tight Junctions

Answer 15

an occluding junction that seals cells together (like zip lock to create a barrier)

Question 16

Desmosomes

Answer 16

an adhesion junction that connects the IF networks of neighboring cells (cadherin-type integral membrane protein)

Question 17

Gap Junctions

Answer 17

a channel forming junction that acts as channels between cells

Question 18

The plant cell wall is primarily made up of different types of

Answer 18

carbohydrate polymers

Question 19

Cellulose

Answer 19

in all plants, the most abundant polymer on earth, polymer of glucose, grants tensile strength (resistance to pulling)