Chapter 16 Flashcards
consist of a glycine in every 3rd position
Triple helix domains
Proline is frequently found in the __ position and hydroxyproline in the __ position.
X, Y
________ are thought to stabilize the triple helix by forming hydrogen bonds
Hydroxyl groups
the only GAG that is a single long polysaccharide chain
Hyaluronan
GAGS linked to proteins
proteoglycans
A distinct site of on fibronectin is recognized by
integrin
Integrins bind: (3 examples)
collagen, fibronectin, and laminin.
Fibronectin has binding sites for:
collagen and GAGs
Basal laminae are mostly type ___ collagen
IV
four groups of cell adhesion molecules
Selectins
Integrins
Immunoglobulin (Ig)
Cadherins
mediate transient interactions between leukocytes and endothelial cells or blood platelets.
selectins
An adhesion molecule on one cell recognizes a different molecule on another cell.
heterophilic interaction
adhesion molecule on one cell binds to the same molecule on another cell.
Homophilic interaction
mediate homophilic interactions.
cadherins
form a seal that prevents free passage of molecules and ions between cells.
tight junctions
Tight junctions provide minimal adhesive strength between the cells, so they are usually associated with adherens junctions and desmosomes in a:
junctional complex.
open channels through the plasma membrane.
gap junctions
Gap junctions also allow passage of signaling molecules, such as:
cAMP and Ca2+
Gap junctions consist of trans-membrane proteins in the _______ family
connexin
Six connexins form a
connexon
Specialized gap junctions occur on specific nerve cells and form an
electrical synapse.
acts as a glue to hold adjacent cells together
middle lamella
Adjacent plant cells communicate through cytoplasmic connections called
plasmodesmata
Plasmodesmata form by _______________ following mitosis
incomplete separation of daughter cells
