3.4.1 Plasma Membrane: The Extracellular Matrix Flashcards
1
Q
extracellular matrix
A
- an integrated network of carbohydrate and protein for support and cell communication
2
Q
glycoproteins
A
- membrane proteins with carbohydrate chains covalently linked to amino acid side chains. This class of molecules includes collagen. Over half of our body’s proteins are comprised of collagen!
3
Q
proteoglycans
A
- a family of glycoproteins that have a core polypeptide with numerous carbohydrate chains attached. Proteoglycans are high in carbohydrate, which may comprise as much as 95 percent of the weight of the
molecule
4
Q
fibronectins
A
- a family of glycoproteins consisting of two polypeptides
linked by bonds. They bind matrix molecules to plasma membrane proteins.
5
Q
actin filaments
A
- underneath the lipid bilayer bind to plasma membrane
proteins, adding further support to the extracellular matrix. - Cell signals are created by the physical perturbation of components of the matrix. It is hypothesized that certain forms of cancer may occur when errors in cell signals occur.
6
Q
Which of the following is an example of a glycoprotein involved in the extracellular matrix?
A
- collagen
7
Q
Which of the following statements regarding collagen is false?
a. Collagen is a glycoprotein.
b. Collagen is found outside the cell.
c. Collagen is bound to cytoskeletal components.
d. About half of the total protein in the human body is collagen.
A
- c. Collagen is bound to cytoskeletal components.
8
Q
Integrins
A
- are plasma membrane proteins.
9
Q
Which of the following is/are not found in animal cell membranes?
A
- nucleic acids
10
Q
True or false?
On the inside of the cell, plasma membrane proteins involved with the extracellular matrix are anchored to fibronectins.
A
- false
