I think 2
but not shure : I
hope this helps
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.
B continue to produce oxygen
Explanation:
carbon will not reduce to synthesise sugars
The cell which located on the surface of an endoplasmic reticulum is ribosomes
