Question 1

Which of the following best describes the difference between a compound and a mixture?

Accepted Answer

Compounds involve chemical bonding between components, while mixtures do not.

Question 2

A patient is suffering from dehydration. Which property of water is most important for rehydrating cells quickly?

Accepted Answer

Polar solvent properties

Question 3

Which of the following is true regarding the atomic structure of carbon?

Accepted Answer

Carbon can form up to four covalent bonds because it has four electrons in its valence shell.

Question 4

Which of the following best explains why enzymes are essential for life?

Accepted Answer

They lower the activation energy, allowing reactions to proceed rapidly at body temperature.

Question 5

A solution contains 180.12 g of glucose ($$C_6H_{12}O_6$) dissolved in enough water to make 1 liter. What is the molarity (M) of this solution?

Accepted Answer

$$1\ M$$

Question 6

Which of the following statements about acids and bases is correct?

Accepted Answer

Acids release $$H^+$$ ions in solution, while bases release $$OH^-$$ ions.

Question 7

A patient’s arterial blood pH is measured at 6.9 during CPR. Based on your knowledge of enzyme function and pH, what is the most likely outcome?

Accepted Answer

Enzyme activity will decrease, leading to a poor prognosis.

Question 8

Which of the following best describes a hydrogen bond?

Accepted Answer

A weak attraction between a hydrogen atom carrying a partial positive charge and an electronegative atom with a partial negative charge.

Question 9

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

Accepted Answer

$$A + B \rightarrow AB$$

Question 10

Which of the following is a property of phospholipids that makes them essential for cell membrane structure?

Accepted Answer

They have both hydrophilic heads and hydrophobic tails.

Question 11

A molecule of DNA differs from RNA in which of the following ways?

Accepted Answer

DNA is double-stranded and contains deoxyribose; RNA is single-stranded and contains ribose.

Question 12

Which of the following best describes the role of ATP in cellular metabolism?

Accepted Answer

ATP provides immediate, usable energy for cellular work.

Question 13

Which of the following is an example of a buffer system in the human body?

Accepted Answer

Bicarbonate buffer system

Question 14

Which of the following is a correct statement about the octet rule?

Accepted Answer

Atoms are most stable when they have 8 electrons in their valence shell, except for hydrogen and helium.

Question 15

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

Accepted Answer

Catalyzing chemical reactions

Question 16

A solution has a pH of 5. How many times more acidic is it than a solution with a pH of 7?

Accepted Answer

100 times

Question 17

Which of the following best describes a colloid?

Accepted Answer

A heterogeneous mixture with large particles that do not settle out.

Question 18

Which of the following is a trace element in the human body and is essential for thyroid hormone production?

Accepted Answer

Iodine

Question 19

Which of the following is true about the difference between saturated and unsaturated fatty acids?

Accepted Answer

Saturated fatty acids have only single bonds and are solid at room temperature; unsaturated fatty acids have one or more double bonds and are liquid at room temperature.

Question 20

Which of the following best describes the role of enzymes in metabolic pathways?

Accepted Answer

They lower the activation energy, allowing reactions to occur rapidly and specifically.

Chemistry Comes Alive: Foundations for Human Anatomy & Physiology

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