You may only be able to manage two hours of MCAT prep if you have a heavy day with classes or work. Tip #2: Assess what else you have going on.Plus, you need time to eat, rest, exercise, and unwind. You may feel like you should be studying all the time, but you likely have other responsibilities and commitments. The Right MCAT Study Schedule for Youĭecide how many hours of prep you should do in a week to create your daily schedule. Our sample schedules can help you tackle the test AND maintain your sanity. MCAT prep may feel overwhelming, but setting the right MCAT study schedule will help you feel more in control. 8/13/20 THE CORRECT ANSWER IS A.COVID-19 Update: To help students through this crisis, The Princeton Review will continue our "Enroll with Confidence" refund policies. Knockout of pyruvate decarboxylase or citrate synthase would effectively shut down the Krebs cycle but would not account for the difference in NADH versus FADH 2 metabolism (choices B and C are wrong). As the cell begins to deplete its store of NAD +, it would begin to undergo fermentation in order to regenerate NAD + (choice D is correct). If this protein were rendered nonfunctional, NADH would no longer be able to make this delivery, but FADH 2 would remain able to do so. NADH, the other commonly used electron carrier, unloads its high-energy electrons in the first step of the electron transport chain, at NADH dehydrogenase. Since FADH 2 is still able to deliver its electrons to the chain, the defect must occur upstream of this process. The protein must be involved in a reaction occurring within the mitochondrion, and given that the products of fermentation rapidly accumulate, this appears to indicate a defect in the electron transport chain. Since the protein of interest is localized to the inner mitochondrial membrane, and since knockout of the gene (and thus elimination of the protein) still allows glycolysis to occur, the protein is likely not hexokinase, which catalyzes the first step in glycolysis and is located in the cytosol (choice A can be eliminated). (Note that telomerase is an enzyme that can lengthen telomeres cells expressing telomerase are often immortal cells and are able to divide an infinite number of times, further emphasizing the importance of the telomeres in preventing senescence.) 9/3/20 THE CORRECT ANSWER IS B. However, the activation of the apoptotic pathway would result in cell death shortly thereafter once the cell ceases to exist, molecular changes will no longer accumulate in the cell and, thus, it ceases to age (choice C would not contribute to cellular senescence and is the correct answer choice). This could lead to problems with the cell and cellular senescence (choice D can contribute to senescence and can be eliminated). The loss of the telomere means that with subsequent cell divisions, as the chromosome continues to shorten, there may be losses of important protein coding regions. Initially, because the telomeres are long, this does not present a problem however, with ongoing rounds of cell division, the telomeres become increasingly shorter and are eventually lost altogether. Telomeres are short sequence repeats found on the ends of linear chromosomes and are typically degraded and shortened during cell division. In turn, this would lead to the production of potentially dysfunctional or harmful proteins, increasing senescence (choice B could contribute to senescence and can be eliminated). Persistence of mutations from errors in DNA synthesis could result in mounting abnormal genetic material. Uneven division of mitotic intracellular debris would lead to increased accumulation of debris in certain cells this may have an inhibitory effect on the metabolism of those cells, leading to senescence (choice A could contribute to senescence and can be eliminated). COVID-19 Update: To help students through this crisis, The Princeton Review will continue our "Enroll with Confidence" refund policies.
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