Silicate tetrahedron. A siliconâoxygen tetrahedron is the Si O 4 anionic group, or a silicon atom with four surrounding oxygen atoms arranged to define the corners of a tetrahedron. This is a fundamental component of most silicates in the Earth's crust. siliconâoxygen tetrahedron is the Si O 4 anionic group, or a silicon atom with four surrounding oxygen atoms arranged to define the corners of a tetrahedron.
Best Answer: G proteins are special proteins that help plasma membrane receptors work. Many different signal molecules use G-protein linked receptors, including epinephrine and other hormones. It is part of a second messenger system. How it works is that some chemical messenger binds to the receptor at the membrane.
1 Glucagon binds its receptor in the plasma membrane of target cells (e.g. hepatocytes). 2  Bound receptor interacts with and, through a set of G proteins, turns on adenylate cyclase, which is also an integral membrane protein.ell surface receptors are integral membrane proteins and, as such, have regions that contribute to three basic domains: 1  Extracellular domains: Some of the residues exposed to the outside of the cell interact with and bind the hormone-another term for these regions is the ligand-binding domain.