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Cells 8

Cell Signalling

QuestionAnswer
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
Created by: Weybz13