Answer:
Ligand-receptor interaction is the first interaction that triggers cell signalling.
Explanation:
Ligands are the hormones, drugs or neurotransmitters that specifically bind with receptors present in cell surface to initiate cell signalling. Ligand binding to the receptor is reversible. Binding of the ligand to the receptor can activate or inactivate receptor. Activation may lead to cell signalling pathways. Inside cells, there are secondary molecules which on activation starts a cascade of reactions. which in-turn regulate the function of the ligand molecule.
Best Choice:
Ligand-receptor interaction is the first interaction that triggers cell signalling.
Your body used the respiratory system (lungs)
<span>hromoplast is the generic term but is usually used to refer only to those plastids that do not have chlorophyll.</span>
Energy. A solute can only move against concentration gradients using active transport which requires energy
They are all necessary for photosynthesis to occur.
