PHP â Sort Functions For Arrays. In this chapter, we will go through the following PHP array sort functions: sort() â sort arrays in ascending order. rsort() â sort arrays in descending order. asort() â sort associative arrays in ascending order, according to the value.
Environmental factors that can affect gene expression. Exposing a fetus, infant, or child to a chemical or nutritional (or other) stressor during development can affect the risk of disease development even into adulthood. The mechanisms involved are probably epigenetics (Boekelheide et al. 2012).
Post-transcriptional Controls 289 POST-TRANSCRIPTIONAL CONTROLS We have seen that transcription regulators control gene expression by switching on or off transcription initiation. The vast majority of genes in all organisms are regulated in this way.n Overview of Gene Expression 271made in reticulocytes, the cells that develop into red blood cells, but it cannot be detected in any other cell type.Many proteins in a cell are produced in such small numbers that they cannot be detected by the technique of gel electrophoresis.