Exam 8: Cell-Cell Interactions

Pemphigus vulgaris is an autoimmune disorder in which antibodies are produced against the cadherins of desmosomes.The blistering seen in these individuals is probably a result of

What is a major difference in the extracellular matrix (ECM)between plant and animal cells?

Hormones function as

Transport of materials across a cell membrane

Intercalated disks are cell-cell junctions found between cardiac muscle cells.A feature of intercalated disks is a large number of gap junctions.This means

Osteocytes are bone cells.Collagen fibers and calcium salts are found in abundance between and among the osteocytes.The collagen and calcium salts are

A G-protein receptor with GTP bound to it

Second messengers

Anorganic bone matrix (ABM)is a material commonly used in bone grafts.Scientists compared ABM with ABM-peptide.The peptide that was bound to ABM was 15 amino acids long,derived from the extracellular matrix molecule,collagen.The researchers found that anchorage-dependent cells were more likely to adhere to and grow on the ABM-peptide than on ABM alone.What conclusion might be drawn from this research?

A kinase is an enzyme that

What is the function of the middle lamella in plant cells?

Which of the following statements is false?

Scientists have found that extracellular matrix components may induce specific gene expression in embryonic tissues such as the liver and testis.For this to happen,there must be direct communication between the extracellular matrix and the developing cells.Which kind of transmembrane protein would most likely be involved in this kind of induction?

If cancer cells detach from neighboring cells,what is a likely outcome of this event?

Insulin is a hormone produced by the pancreas.When insulin binds to its receptor,which of the following will occur?

One characteristic of life and living systems is that they are able to adapt.Toward this end,cells interact with other cells and their environment through the action of their

All of the following can be proteins found in the extracellular matrix of animal cells except

Which of the following hormones stimulates fruit ripening?