Q: Which of the following equations correctly expresses molarity ($M$) of a solution?

$M = \frac{\text{moles of solute}}{\text{liters of solution}}$

Question 1

Which of the following best describes a solution in the context of body fluids?

Accepted Answer

A homogeneous mixture where the solute is evenly distributed within the solvent and does not settle out.

Question 2

A patient is given an intravenous saline solution. Which component acts as the solvent in this mixture?

Accepted Answer

Water

Question 3

Which property of water allows it to absorb and release large amounts of heat with little change in its own temperature, and why is this important for homeostasis?

Accepted Answer

High heat capacity; it helps maintain stable internal body temperature despite external temperature changes.

Question 4

Which of the following best explains why blood is considered a suspension?

Accepted Answer

It contains large particles (cells) that settle out if left undisturbed.

Question 5

A buffer system in the blood helps maintain pH within a narrow range. What would happen if a strong acid was added to the blood?

Accepted Answer

The buffer would bind excess $H^+$ ions, minimizing the change in pH.

Question 6

Which of the following equations correctly expresses molarity ($M$) of a solution?

Accepted Answer

$M = \frac{	ext{moles of solute}}{	ext{liters of solution}}$

Question 7

Which of the following is a function of electrolytes in the human body?

Accepted Answer

They allow for muscle contraction and transmission of nerve impulses.

Question 8

A synthesis reaction in the body is best described as:

Accepted Answer

A reaction where smaller molecules combine to form a larger, more complex molecule.

Question 9

Which of the following statements about ATP is correct?

Accepted Answer

ATP stores energy in its phosphate bonds and releases it when a phosphate group is transferred to another molecule.

Question 10

Which of the following best describes the difference between saturated and unsaturated triglycerides?

Accepted Answer

Saturated triglycerides have only single covalent bonds between carbon atoms, while unsaturated triglycerides have one or more double bonds.

Question 11

A patient with a blood pH of 7.1 is experiencing acidosis. Which of the following best explains the role of buffers in this situation?

Accepted Answer

Buffers will bind excess $H^+$ ions to help raise the pH toward normal.

Question 12

Which of the following is a correct statement about the structure and function of phospholipids?

Accepted Answer

They have a hydrophilic phosphate head and two hydrophobic fatty acid tails, making them ideal for forming cell membranes.

Question 13

Which of the following best explains why water is called the 'universal solvent' in the body?

Accepted Answer

It can dissolve a wide variety of solutes, including ions and polar molecules, facilitating transport and chemical reactions.

Question 14

Which of the following is a correct match between a macromolecule and its monomer?

Accepted Answer

Protein – amino acid

Question 15

A patient is unable to digest polysaccharides efficiently. Which of the following is most likely impaired in this patient?

Accepted Answer

The breakdown of complex carbohydrates into monosaccharides for energy.

Question 16

Which of the following best describes the function of enzymes in the body?

Accepted Answer

They lower the activation energy required for chemical reactions, increasing the rate of those reactions.

Question 17

Which of the following is a real-life example of a sol-gel transformation in the body?

Accepted Answer

The cytosol of a cell changing consistency during cell division.

Question 18

Which of the following statements about carbon is correct and explains its importance in organic molecules?

Accepted Answer

Carbon is electroneutral, allowing it to form stable bonds with many elements and create diverse molecular structures.

Question 19

A solution contains 0.5 moles of glucose dissolved in enough water to make 1 liter of solution. What is the molarity of the solution?

Accepted Answer

$0.5\ 	ext{mol/L}$

Question 20

Which of the following best explains why high or low pH can disrupt cellular activity?

Accepted Answer

Extreme pH can alter protein structure and function by disrupting chemical bonds.

Chemistry Foundations for Anatomy & Physiology: Mixtures, Chemical Reactions, and Macromolecules

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