Question

1) The studies in cell sorting and affinity demonstrated

A	the epidermis has a tighter affinity that the nueraltissue

B	the mesoderm is never capable of resorting as the outter layerof a re-sorted tissue

C	all of the above

D	mesoderm actually requires input from both the ectoderm andendoderm to "know" it's middle location

E	there is no mechanism in which cells known their properlocation identity within a developing embryo

2) The extracellular matrix

A	provides a structure for cells to crawl over

B	contains multiple signaling proteins to guide/repel cells sothey progress in the correct direction

C	interacts with the transmembrane proteins on the cells toproduce a response

D	all of the above

3) EMT is required

A	for mammary glad formation

B	for progression of cancer from single tumor to metastaticcancerous cells roaming throughout the body

C	for neural crest cell formation which provides the cells forinternal organs

D	all of the above

E	for the initiation of gastrulation in birds and mammals becausethey form as a disc and not a ball of cells

4) Permissive induction

A	allow for species to change their genetic fate due to thesignals recieved from surrounding tissue

B	describes regions of specificity hotspots within the developingembryo

C	describes when cells that no indication towards their fate dueto having the proper signalling/surroundings

D	none of the above

5) Classical Cadherins (those dependent on calcium for properfunction)

A	all have the same sequence identity (~98%) on the intracelluarside acroos multipe species

B	are all regulated by the same 3 catenin proteins to regulatestability and cytoskeletal regulation

C	Require calcium for a conformational change to present theirbinding site

D	are very specific to which other cadherin on the neighboringcell it is interested in binding to

E	all of the above