For each of the following sentences, fill in the blanks with the best word or ph

Question

For each of the following sentences, fill in the blanks with the best word or phrase selected from the list below. Not all words or phrases will be used. The survival, proliferation and size of each cell in an animals are controlled by extracellular signal molecules secreted by neighboring and distant cells. Many of these signal molecules bind to a cell-surface receptors and trigger various intracellular signaling pathways. One class of signal molecules, called___, stimulates cell division. Members of a second class of signal molecules are called ____,because they simulate cell growth and an increase in cell mass. The third class of signal molecules, called ____, inhibits___by regulating members of the ____family of proteins. In addition to such stimulatory factors, some signal proteins such as ___act negatively on other cells, inhibiting their survival, growth, or proliferation.

Explanation / Answer

one class of signal molecules called mitogens, stimulate cell division

members of second class of signal molecules are called growth factors, because they stimulate cell growth and increase in cell mass.

third class of signal molecules are called survival factors, inhibits apoptosis by regulating members of the Bcl-2 family of proteins

some signal proteins such as ligand act negatively on other cells, inhibiting their survival, growth or proliferation

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