Long-time stimulant drug users have excessive amounts of dopamine in the synaptic cleft due to inhibition of re-uptake.īecause of this, the body responds by decreasing the amount of available receptors.
MCAT Practice 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.
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. MCAT Practice 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. Steroid hormones, derived from cholesterol, act on intracellular receptors and produce mRNA specific to the outcome they produce. This will likely be categorized as which type of hormone?Īnswer: B. 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. MCAT Practice 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. We encourage you to review both options and see which MCAT practice test better fits your needs. Some of these providers include MCAT diagnostic tests for no extra charge. The second option is to use the MCAT sample questions from one of the other providers we have listed below. We have 8+ practice tests with the MCAT questions broken down by the section you will find them on the MCAT.Īll of our MCAT practice questions are automatically scored and include answer explanations to help you better understand the material and why an answer was right or wrong.
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