Question 1

Which of the following best explains why water is considered a polar molecule?

Accepted Answer

Because the oxygen atom is more electronegative, creating a partial negative charge near oxygen and a partial positive charge near hydrogen.

Question 2

A patient is suffering from acidosis. Which of the following blood pH values would most likely be observed in this patient?

Accepted Answer

$$7.00$$

Question 3

Which of the following best describes the function of enzymes in biochemical reactions?

Accepted Answer

Enzymes lower the activation energy, allowing reactions to occur more rapidly.

Question 4

Which of the following is a correct statement about ionic bonds?

Accepted Answer

Ionic bonds form when one atom donates an electron to another, resulting in oppositely charged ions that attract each other.

Question 5

A solution has a hydrogen ion concentration of $$[H^+] = 1 	imes 10$$^{-8}$$ \ \mathrm{mol/L}. $$What is the pH of this solution?

Accepted Answer

$$8$$

Question 6

Which of the following best describes a dehydration synthesis reaction?

Accepted Answer

A reaction in which two monomers are joined together by removing a molecule of water.

Question 7

Which of the following statements about buffers is correct?

Accepted Answer

Buffers maintain pH by releasing or absorbing $$H^+$$ ions as needed.

Question 8

A molecule of glucose ($$C_6H_{12}O_6$) is classified as which of the following?

Accepted Answer

A monosaccharide

Question 9

Which of the following best explains why water has a high heat capacity?

Accepted Answer

Hydrogen bonds between water molecules require a large amount of energy to break.

Question 10

Which of the following is a property of a solution with a pH of 12?

Accepted Answer

It is basic (alkaline) and has a high concentration of $$OH^-$$ ions.

Question 11

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

Accepted Answer

Saturated fatty acids have no double bonds and are solid at room temperature, while unsaturated fatty acids have one or more double bonds and are liquid at room temperature.

Question 12

A patient is given a solution with a pH of 3. Which of the following best describes this solution?

Accepted Answer

It is a strong acid.

Question 13

Which of the following is true about hydrolysis reactions in the body?

Accepted Answer

They break down polymers into monomers by adding water.

Question 14

Which of the following best explains why electrolytes are important in the human body?

Accepted Answer

They conduct electrical currents in body fluids, which is essential for nerve and muscle function.

Question 15

Which of the following is a correct statement about the relationship between acids, bases, and pH?

Accepted Answer

As the concentration of $$H^+$$ increases, the pH decreases.

Question 16

Which of the following best describes the tertiary structure of a protein?

Accepted Answer

The overall three-dimensional shape of a single polypeptide chain, stabilized by interactions between side chains.

Question 17

Which of the following is a correct example of a synthesis (anabolic) reaction?

Accepted Answer

$$A + B \rightarrow AB$$

Question 18

Which of the following statements about phospholipids is correct?

Accepted Answer

Phospholipids have hydrophilic heads and hydrophobic tails, making them essential components of cell membranes.

Question 19

Which of the following best explains why water is an excellent solvent for ionic compounds?

Accepted Answer

Water molecules surround and separate ions due to their polarity, allowing the ions to dissolve.

Question 20

A solution contains $$1 	imes 10$$^{-4}$$ \ \mathrm{mol/L} of$$ $$OH^-$$ ions. What is the pH of this solution?

Accepted Answer

$$10$$

Fundamentals of Chemistry for Anatomy & Physiology

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