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The molecule that can bind to a receptor protein is called a ligand.
shape.
receptor proteins bind to signal molecules
Biomolecular structure is the intricate folded, three-dimensional shape that is formed by a molecule of protein, DNA, or RNA, and that is important to its function.
When a receptor protein acts as an enzyme, the receptor protein activates a second messenger that acts as a signal molecule within the cell. Resources: HOLT Biology Textbook - 9th grade edition Chapter 4, Cells and Their Environment.
... a receptor protein.
The structure of the hemoglobin in a molecule is the quaternary structure.
Signal Transduction
A channel linked receptor transduces functions of the same protein molecule. An example of a channel linked receptor are neurotransmitters in the brain.
The function of each protein molecule depends on its specific sequence of amino acids, as well as its three-dimensional structure. These factors determine how the protein interacts with other molecules and what biological activities it can perform. The function can also be influenced by factors such as post-translational modifications and the protein's cellular location.
G-protein-linked receptor
Receptor proteins- have a binding site for a specific molecule