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.Increased histone acetyltransferase activity.When acting on DNA, which of the following processes will usually lead to a decrease in gene expression? Question: One of the many reasons that the eukaryotic cell can possess so much information in its DNA is the ability to condense coding regions when they are not being expressed. Question #2Ĭategory: Chemical and Physical Foundations Amino acid hormones can have the ability to enter the cell, but are usually made up of very small combinations of amino acids, and never of cholesterol, a four hydroxycarbon ring. Peptide hormones, such as insulin, act on outer membrane receptors, but are polarized, so they cannot enter the cell. Thus, they are found both inside and out of the cell. This will likely be categorized as which type of hormone?Īnswer: B. Steroid hormones, derived from cholesterol, act on intracellular receptors and produce mRNA specific to the outcome they produce. Question: A scientist using mouse models to determine the response of blood hormones to large levels of glucose in the body discovers a new hormone not previously described.Īccording to his data, this hormone is found both inside and out of cells when carrying out its function, increase the amount of nucleic acid in the cell while functioning, and are derived from a structure containing four hydroxycarbon rings. Question #1Ĭategory: Biological and Biochemical Foundations We have provided some examples from different sections that are tested on the MCAT. In order to provide you with a better understanding of MCAT practice questions, we have provided you with a quick overview of some MCAT example questions. Use their MCAT practice questions to prepare for the exam. Also take a full-length MCAT practice test. Full-length exam with MCAT sample questions. These providers offer various MCAT diagnostic tests to help you figure out what information you know, and what information you do not know. If you want some more MCAT practice after using our questions above, use one of the providers in the table below.
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