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Cells 8
Cell Signalling
| Question | Answer |
|---|---|
| Signalling through receptor kinases often: | Leads to the activation of a cascade of enzyme kinases |
| Steroids (steroid hormones) are examples of hydrophobic cell signalling molecules that | Rely on intracellular receptors |
| The cell-cell interactions are: | Essential for all multi-cellular organisms |
| The receptors for steroid hormones and peptide hormones are fundamentally different because | peptides are hydrophilic and steroids are hydrophobic |
| An example of an ion commonly used by cells for intracellular signalling is: | Ca2+ |
| Intracellular signalling proteins that act as molecular switches are often controlled by phosphorylation reactions | True |
| The fragment binds to receptor proteins on nearby cells and activates signaling pathways resulting in altered gene expression patterns in the cells. | Paracrine signaling |
| Which of the following is NOT a common second messenger in cell signaling? | Tyrosine |
| Signalling through G proteins is self-limiting because G proteins: | Hydrolize GTP to GDP inactivating themselves |
| Which of the following receptors is not a membrane receptor: | Steroid hormone receptor |
| What is the function of Ras during tyrosine kinase cell signalling? | It links the receptor protein to MAP kinase pathway |
| Endocrine signals are | Released by cells into bloodstream |
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Weybz13