Nextdoor is the private social network for your neighborhood. On Nextdoor, neighbors create private groups for their neighborhoods where they can ask questions, get to know one another, and exchange local advice and recommendations.
Up-regulation is a process that occurs within a cell triggered by a signal (originating internal or external to the cell), which results in increased expression of one or more genes and as a result the protein(s) encoded by those genes.
Most cells have: 1  A nucleus â controlling the activity of the cell. 2  All cells have these at one point. 3  Cytoplasm â where chemical reactions occur. 4  Inside the cytoplasm are enzymes which speed up these reactions. 5  A cell membrane â to control the passage of substances in and out of the cell.ost cells have: 1  A nucleus â controlling the activity of the cell. 2  Cytoplasm â where chemical reactions occur. 3  A cell membrane â to control the passage of substances in and out of the cell. 4  A Mitochondria which is where the energy is released from.