Lecture 6- Extracellular Structures

Question 1

plant cell wall function

Answer 1

maintains cell shape and prevents excess uptake of water

Question 2

structure of plant cell wall

Answer 2

cellulose

Question 3

animal extracellular matrix (ECM) function

Answer 3

maintains cell attachments across long distances, allows communication, maintains tissue integrity, stores growth factors

Question 4

ECM structure

Answer 4

secreted glycoproteins

Question 5

collagen

Answer 5

forms matrix of ECM and connects cells over long distances

Question 6

fibronectin

Answer 6

link collagen to integrins

Question 7

integrins

Answer 7

proteins that link ECM to the cytoskeleton

Question 8

epithelial layers

Answer 8

layers of cells b/w you and environment

Question 9

epithelial cells must stay connected to _____ and to _______ otherwise they undergo apoptosis

Answer 9

ECM; each other

Question 10

tumor

Answer 10

mass of cells that arose from unregulated cell divisions and through accumulation of mutations

Question 11

one major early steps in cancer progression is a _______to ECM

Answer 11

loss of attatchment

Question 12

intercellular junctions in epithelial cells maintain _______

Answer 12

tissue integrity

Question 13

tight junctions function

Answer 13

seal cells together and prevent passage of molecules in between gap between cells

Question 14

desmosomes function

Answer 14

distribute stretching force across a tissue and connect the cytoskeleton (IF) of adjacent cells

Question 15

gap junctions function

Answer 15

provide non-selective transport of small molecules b/w cells
-allows sharing nutrients and signals