Exam 3 Part 3

Question 1

Proteoglycans

Answer 1

Component of ECM, repeating structure of proteins and sugars

Question 2

glycosaminoglycans

Answer 2

GAG - proteins linked to long chains of negatively-charged polysaccharide polymers

Question 3

glycosaminoglycans

Answer 3

GAG - proteins linked to long chains of negatively-charged polysaccharide polymers

Question 4

functional properties of proteoglycans

Answer 4

negative charge attract Na+ which attracts water, results in a gel-like consistency
Provides protection against compression, shock absorption, lubrication, and space filing
occupy large volume relative to mass
combination with tensile strength of collage nmakes a very though tissue: can support hundreds of kg/cm2

Question 5

polarization of epithelial cells at the surface

Answer 5

= function
junctions help with sidedness
apical and basal sides

Question 6

tight junction

Answer 6

seals neighboring cells together in an epithelial sheet to prevent leakage of extracellular molecules between them;helps polarize cells

Question 7

adherens junction

Answer 7

joins an actin bundle in one cell to a similar bundle in a neighboring cell

Question 8

desmosome

Answer 8

joins the intermediate filaments in one cell to those in a neighbor

Question 9

gap junciton

Answer 9

forms channels that allow small, intracellular, water-soluble molecules, including inorganic ions and metabolites, to pass from cell to cell

Question 10

hemidesmosome

Answer 10

anchors intermediate filaments in a cell to the basal lamina

Question 11

tight junction proteins

Answer 11

occludin and claudin

seal to itself not each other

Question 12

cadherin

Answer 12

in adherens junction

transmembrane protein that bind to each other outside cells and to a linker protein inside cells

Question 13

adherens junctions protein

Answer 13

cadherin

Question 14

occludin and claudin

Answer 14

tight junction proteins

Question 15

adhesion belt

Answer 15

vital for developmental movements

form from adherens junctions

Question 16

connexons

Answer 16

make up gap junctions, several together make up
small, inorganic molecules can pass through these
how heart beats regularly

Question 17

cell wall

Answer 17

provide the tensile strength in plant cells instead of collagen

Question 18

cellulose

Answer 18

comprises most of cell wall - associates with plectin

Question 19

lignin

Answer 19

cross-links with cellulose in wood

Question 20

plasmodesmata

Answer 20

in plants, similar to gap junction

desmotubule makes tube between the ER of two adjacent cells and through the cell wall