A signal reaches a cell mostly in the form of a signalling molecule binding to a receptor on the cell surface. This binding activates a chain of events that amplifies the signal and transfers it inside the cell. Protein kinases phosphorylate proteins and cause their activation or deactivation, or in general modify their activity. When a signalling molecule binds to a receptor, a cascade is activated and the second messengers, such as cAMP, are synthesized. cAMP molecules activate the protein kinases, which phosphorylate specific proteins and activate them.
The answer is cell division
I believe the mineral he found was mica.
A simple way to remember the difference between mitosis and meiosis is that <u>Mitos</u>is produces cells found in <u>my toes</u> and the rest of your body cells. Meiosis creates sex cells for the purpose of reproduction.
<span>The mutation did not affect amino
acid sequence or the molecular weight (no evidence of amino acid substitution
or protein truncation). Therefore, the mutation is not likely within the coding
region of the gene. Most likely the
mutation is in the regulatory region of the gene such as the promoter region.
Such mutation would interfere with transcription initiation and hence decreases
the amount of mRNA and protein produced. </span>
