Developmental Biology 433
Quiz 1
Name ___________________________
1. (2 points) Potency is a term to describe:
a. The range of cell fates a cell is capable of assuming.
b. The strength of interactions a cell has with other cells.
c. The ability of a cell to assume its normal cell fate when isolated.
d. The ability of certain embryos to compensate for removed cells.
2. (2 points) Choose the term that best completes the following sentence.
The differential affinity of different cell types for one another is mediated by cell
surface molecules called _Cell adhesion molecules_.
Actin
Affinitrins
Cell adhesion molecules
Extracellular matrix
Integrins
Microtubules
Receptor kinases
3. a. (2 points) Describe or define paracrine signaling.
Signaling between cells over short distances, not requiring direct cell-cell contact.
b. (4 points) What are the key properties of the signaling molecules in paracrine
signaling?
Any two of the following:
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They are secreted or otherwise released to the outside of the cell.
They are diffusible over short distances.
They are usually proteins.
I also accepted they are bound by receptors on the responding cell.