MCAT Question of the Day

Which of the following compounds will not react with acetyl chloride?

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Curare is a chemical used in arrow poisons as well as in pharmaceutical compounds. It competes with acetylcholine for receptor sites along the motor end plate. The immediate physiological effects of high doses of curare can include:

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During respiratory ventilation, impulses along the phrenic nerves stimulate the diaphragm, causing it to contract and move downward. When this occurs, which of the following takes place in the thoracic cavity and lungs?

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Chromosome puffs can be observed along giant polytene chromosomes in the salivary gland cells of insect larvae. They appear ot be regions of DNA that uncoil or decondense. The locations of puffs change at different times during larval development in response to hormonal signals. This phenomenon is an example of:

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The inflammatory response results from the release of histamine by mast cells or basophils. The redness, heat, pain, and swelling associated with inflammation are due to which physiological effects of histamine?

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For the reaction 2NO2 –> N2O4, which of the following is true?

I. Adding NO2 shifts the equilibrium to the right.
II. Increasing the volume of the container shifts the equilibrium to the right.
III. Adding helium gas to the container shifts the equilibrium to the right.

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What is the work done in holding a 20-N weight at a height of 2 m above the floor for a total of 5 s?

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The human body has various ways to protect itself against pathogens, including specific and nonspecific defense mechanisms. The nonspecific defenses do not distinguish one pathogen from another. Which of the following would NOT be considered a component of the nonspecific defenses?

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The period of a simple pendulum can be increased by:

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The cerebellum is the part of the brain that helps coordinate skeletal muscles and helps maintain posture and balance. To perform this complex function, the cerebellum must receive input from:

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