There is cell death in the areas with high dopamine cells.There are decreased dopamine receptors on the post-synaptic membrane.There is decreased dopamine in the synaptic cleft.What is the likely state of this patient’s dopamine system? They are acting aggressive, and claiming they need medication or “bad things will happen”. Question: A patient comes into the ER looking extremely agitated. Question #3Ĭategory: Psychological, Social, and Biological Foundations Methylation is an epigenetic modification that generally trends toward silencing gene expression. Histone deacetyltransferase (HDAC) binds DNA more tightly to histone, creating more heterochromatin, which is not expressed. Although in the real world these methods are not exclusive to increasing or decreasing activity, for MCAT testing purposes, histone acetyltransferase (HAT) frees DNA from histone proteins for expression. Increase in heterochromatin:euchromatin ratioĪnswer: C. This is a straightforward question that assesses knowledge of modification of DNA segments.Decrease in histone deacetyltransferase activity. ![]()
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