Exam 7: Interactions Between Cells and Their Environment

What class of plant cell proteins facilitates plant cell growth by causing a localized relaxation of the cell wall,which allows the cell to elongate at that site in response to turgor pressure generated within the cell?

During gap junction formation,connexons in apposing cells become tightly connected through extensive noncovalent interactions of __________.

Collagen fibrils are strengthened by covalent cross-links between _____ and ____ residues on adjacent collagen molecules.

From what cell organelle does the desmotubule appear to be derived?

Why would the collagen found in basement membranes have molecular arrangements and structure different from that found in other collagens and what are some of these differences?

What ion is not known to bind to integrins?

What determines the strength of adhesion between apposing cells held together by cadherins?

Which tissues below are not typically derived from the single-celled epithelium on the dorsal surface of a chick embryo after gastrulation?

What could be defined as an organized network of extracellular materials found beyond the immediate vicinity of the plasma membrane?

Which tight junction will form a tighter seal?

Cells were allowed to bind to beads that had been covered with a coating of fibronectin.When the membrane-bound beads were pulled by an optical tweezer,the resultant mechanical stimulus was transmitted into the cell interior.What response did this cause?

Which animal cell structure do plasmodesmata in plants most closely resemble?

What kind of molecule does not pass through a gap junction?

What is thought to be the origin of immunoglobulins?

What is the function of most IgSFs?

A scientist is growing cartilage cells in culture.He accidentally spills into the culture enzymes that enzymatically digest the ECM surrounding the cartilage cells.What happens to the behavior of the cartilage cells? How could any change in behavior be reversed?

________ are members of an integral membrane glycoprotein family that bind to specific sugar arrangements in oligosaccharides that project from the surfaces of other cells.

Evidence strongly suggests that the bent conformation of an integrin is _______ and unable to bind its ligand.

Type II collagen mutations alter the properties of cartilage tissue and are known to cause _______.

You coat a Petri dish with fibronectin and proteoglycans and culture cells on the dish.The cells adhere to the dish.You repeat the experiment but this time add RGD tripeptides to the culture dish as the cells are added.The result of this experiment is an example of what biochemical process?