Free Test Prep MCAT Exam Questions

Which of the following molecules will stop being produced first when oxygen is no longer supplied to the cell? Section: Biological Sciences 

When softball players take batting practice, they often use a machine called an “automatic pitcher,” which isessentially a cannon that uses air pressure to launch a projectile. In a prototype automatic pitcher, a softball isloaded into the barrel of the cannon and rests against a flat disk. That disk is locked into place, and a high airpressure is built up behind it. When the disk is released, the softball is pushed along the barrel of the cannonand ejected at a speed of V0.Figure 1 shows the batter and automatic pitcher. The angle of the barrel to the horizontal is θ. The unit vectors iand j point in the horizontal and vertical directions respectively.Figure 2What is the ratio of the horizontal distance traveled by the softball at Point B to the horizontal distance traveledat Point C?Section: Physical Sciences

Early experimentation on the single-celled organism Acetabularia led to important discoveries about the role ofthe nucleus in regulating cell function. Acetabularia is an enormous single cell with three distinct regions: a cap,a root-like rhizoid, and a stalk which connects the two. The following experiments were conducted to study thedevelopment of the cell:Experiment 1The stalk of an Acetabularia was cut, fragmenting the cell. The fragment which included the cap died shortlyafterwards while the fragment containing the rhizoid regenerated to form a complete Acetabularia.Experiment 2The nucleus from Acetabularia mediterranea, which has a flat cap, was transplanted into Acetabulariacrenulata, which has a tufted cap, following removal of the Acetabularia crenulata nucleus. The Acetabulariacrenulata cap eventually assumed the flat shape.Experiment 3The nucleus of Acetabularia mediterranea was removed from the young cell before it first formed a cap. Anormal cap formed several weeks later. The cell proved to be inviable and died shortly thereafter.Experiment 4A young Acetabularia was fractioned into a number of portions before it first formed a cap. Several weeks later,both the portion containing the nucleus and the portion containing the apical tip of the stalk formed caps. Theother portions did not form caps.Acetabularia is a(n):Section: Biological Sciences 

What is the relationship between suicide rates and social change according to the sociologist Emile Durkheim?Section: Psychology and Sociology 

Before birth, the rodent brain is sexually undifferentiated. It is only in the first few days following birth, during aperiod referred to as the critical period, that the rodent brain differentiates along male or female lines. Thehormone testosterone plays a critical role in this development. Specifically, sexual differentiation is determinedby the presence of estradiol, an estrogen derivative of testosterone, in certain areas of the brain. Testosteroneis converted to estradiol in critical brain cells that contain the enzyme aromatase.To study the effects of testosterone on the neonatal rodent brain, the following experiments were conducted:The above research, combined with additional studies, concluded that testosterone has two “organizational”effects on the male rodent brain:DefeminizationModerate levels of testosterone-derived estradiol during the critical period are sufficient for defeminization ofthe brain. Defeminization of the rodent brain results in loss of estrogen positive feedback on LH and FSHsecretion and the ensuing loss of cyclicity, as well as loss of female sex behavior.MasculinizationHigh levels of estradiol due to high levels of testosterone during the critical period results in masculinization ofthe brain. Masculinization leads to the induction of male sex behavior including antagonism towards othermales and the mounting of females.The conversion of testosterone to estradiol is what type of reaction?Section: Biological Sciences