<h2>Answer:</h2><h2 /><h2>DNA molecules are a precursor to self-replicating RNA molecules, which are used to build proteins. Early RNA molecules were able to self-replicate, which helps to explain why all organisms share the same genetic code.</h2>
How your teeth are shaped and formed
The body will stop making proteins that need it
<h3><u>Answer;</u></h3>
b). Activation of an upstream guanine nucleotide exchange factor
<h3><u>Explanation</u>;</h3>
- <em><u>When a ligand activates the G protein-coupled receptor, it induces a conformational change in the receptor that allows the receptor to function as a guanine nucleotide exchange factor (GEF) that exchanges GDP for GTPthus turning the G protein-coupled receptor on.</u></em>
- The activated G-protein then dissociates into an alpha (G-alpha) and a beta-gamma complex.