Cells communicate with each other by sending out various chemical signals. Once received, signal transduction occurs and the cell responds accordingly. Which of the following statements is true
Cells communicate with each other by sending out various chemical signals. Once received, signal transduction occurs and the cell responds accordingly. Which of the following statements is true
Steroid hormones are broadcast signals that enter cells without the need for an external receptor to begin signal transduction.
Paracrine signalling involves secreted proteins, like growth factors, that travel over long distances to target cells.
Synaptic signalling involves neurotransmitters traveling through neurons to reach target cells throughout the organism.
G proteins are ligands embedded in the cell membrane that begin the transduction process by receiving cell signals.
Cholesterol needs to be carried from cell to cell by a protein called apolipoprotein. Why does cholesterol need to be carried by this, or any other, protein?
Cholesterol cannot enter the cell through the cell membrane due to the fact that it is a hydrophobic molecule.
Since cholesterol is hydrophilic it cannot move through the cell membrane and must be carried through by the apolipoprotein.
Since cholesterol is hydrophobic, it cannot move through the aqueous environment of blood and must be carried.
If there is too much cholesterol, the cell cannot bind to the molecule, so it must be carried.