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Author Archives: Anonymous

Which of the following is true of the cerebellum?

Which of the following is true of the cerebellum?

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Which approach is being used if scientists inject a drug tha…

Which approach is being used if scientists inject a drug that blocks dopamine and then measure changes in movement?

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A mixture is:

A mixture is:

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A student is given two samples: one has pH 6.4 and the other…

A student is given two samples: one has pH 6.4 and the other has pH 7.4. Which statement best compares their hydrogen ion concentrations?

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Which of the following correctly describes cations and anion…

Which of the following correctly describes cations and anions?

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What is the most common charge of the ion formed by magnesiu…

What is the most common charge of the ion formed by magnesium (Mg)?

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Convert 0.55 L to milliliters.

Convert 0.55 L to milliliters.

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The graduated cylinder shown below contains 500. grams of li…

The graduated cylinder shown below contains 500. grams of liquid. What is the density of the liquid? (given mass and volume in graduated cylinder)

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I confirm that I have read and understood the course syllabu…

I confirm that I have read and understood the course syllabus and related policies. 

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A red blood cell is placed in a hypertonic solution and rapi…

A red blood cell is placed in a hypertonic solution and rapidly shrinks. A second red blood cell sample is treated with a compound that reduces the number of functional water channels in the membrane, then placed in the same hypertonic solution. These treated cells shrink more slowly than untreated cells. Identify the tonicity of the solution and predict the direction of net water movement for both samples. Explain why reducing water channels slows the volume change without changing which direction water will move. Predict what would happen if an ion channel opened that allowed potassium to leave the cell while in the hypertonic solution, and explain how that would affect water movement.

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