Exam 7: Interactions Between Cells and Their Environment

You study another tissue that also contains a fibrillar component.In this tissue,however,the fibers are arranged in layers with each layer perpendicular to those above and below it.In addition,the fibers are uniform in size.What properties would such a tissue have?

What substance joins proteoglycans together into gigantic complexes called proteoglycan aggregates? These complexes can occupy very large volumes.

The degradation of the extracellular matrix,along with cell surface proteins,is accomplished mostly by a _____-containing enzyme family called _______.

Which of the following is not a function of the plant cell wall?

Which of the following tissues are typically not derived from mesenchymal cells?

If antibodies to fibronectin are exposed to an embryo through which neural crest cells are migrating,what happens?

While most IgSF members are involved in various aspects of immune function,some of them mediate ________ cell-cell adhesion.

What integral membrane protein family made of two membrane-spanning chains ( $\alpha$ and $\beta$ )is involved in attaching cells to their extracellular microenvironment?

All collagen family members consist of _____ chains arranged in a _______.

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

In the corneal stroma,the uniformity of collagen fiber size and the ordered packing of the fibers confers what property on the corneal stroma?

A new type of communication system has been discovered that consists of thin,highly elongated tubules capable of conducting cell-surface proteins,cytoplasmic vesicles and calcium signals from one cell to another.This system is referred to as ________.

The filaments associated with hemidesmosomes are __________.

Which of the following proteins are known to be associated with focal adhesions?

What kind of experiments have provided evidence that most integrins have unique functions?

The tightest attachment between a cell and its extracellular matrix is seen at the site where an epithelial cell is attached to the underlying basement membrane.The specialized adhesive structure found at such a site is called a(n)________.

What proteins have been shown to be altered by genetic mutations in patients who suffer from epidermolysis bullosa?

If experimentally linked $\alpha$ / $\beta$ heterodimer integrin subunits are separated,what happens?

Each connexon in a gap junction is constructed of ___ connexin subunits.

In the intercellular junctional complex,why is the tight junction closer to the surface of the epithelium (the apical end of the cell)than the belt desmosome?