Gene regulation in eukaryotic cells is regulated by repressors as well as by transcriptional activators. Like their prokaryotic counterparts, eukaryotic repressors bind to specific DNA sequences and inhibit transcription. Any step of gene expression may be modulated, from the DNA-RNA transcription step to post-translational modification of a protein. The following is a list of stages where gene expression is regulated, the most extensively utilised point is Transcription Initiation: Chromatin domains.
Chloroplast and mitochondria. Only mitochondria is an animal.
Salinity refers to the principal characteristic that determines whether an aquatic ecosystem is classified as marine or freshwater. It is the measure of all the salts dissolved in water.
Acid causes metals to corrode
The word you are looking for is aquifers. Aquifers are a body of permeable rock that allows a specific substance that is a liquid or a gas to pass through. In this case, it would be allowing water to pass through.
