Exam 7: Interactions Between Cells and Their Environment

You genetically engineer nonadhesive cells to express different varieties of cadherins and then mix the cells in various combinations. What is the best prediction of the outcome?

Which of the following is NOT a role of proteoglycan?

The blood-brain barrier is very restrictive, preventing even water and small ions from crossing. However, _______ can pass through the blood-brain barrier by sending a signal that opens up the junction.

From the apical surface to the basal surface of an epithelial cell, what is the order of cell junctions observed in the junctional complex?

What type of protein also seen in animal cells spans the plant plasma membrane and is thought to transmit signals from the cell wall to the cytoplasm?

Patients with abnormal claudin-16 gene suffered from ___________.

Epidermolysis bullosa, an inherited blistering disease, is caused by ________.

Which tissues below are NOT typically derived from the cells on the dorsal surface of a mammalian embryo after gastrulation once some of these cells begin expressing N-cadherins and stop expressing E-cadherins?

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

Cadherins appear to be important in holding cells together in __________ tissues.

Calcium ions form bridges between ________.

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

You place mammary gland epithelial cells in culture and then treat them with enzymes that digest the surrounding extracellular matrix. If extracellular matrix materials are then added back to the cells, what happens?

Basement membranes contain type IV collagen, a nonfibrillar collagen organized in a flattened network. The type IV collagen trimer has some interspersed nonhelical segments. What property does this confer upon basement membranes?

What substance joins proteoglycans together into gigantic complexes called proteoglycan aggregates?

You are studying a plant and inject fluorescein, a fluorescent dye, into a single cell on the surface of the plant. After a brief period of time, the dye spreads to cells neighboring the injected cell. What do you conclude?

The filaments associated with hemidesmosomes are correctly known as __________. (Select all correct choices)

What lines the plasmodesmata seen in plant cells?

L1 is an IgSF molecule that has been shown to be important in neural development; it is thought that it may be involved in axon growth within the embryonic nervous system. What evidence supports this statement?

What can be described as solitary, nonadhesive, nonpolarized migratory cells arrangement?