Q: A solution has a pH of 4. What is the concentration of hydrogen ions $$[H^+] in $$this solution?

$$[H^+] = 10$$^{-4}$$ \ \text{M}$$

Question 1

Which of the following best describes the difference between kinetic and potential energy in the context of human physiology?

Accepted Answer

Kinetic energy is the energy of motion, such as blood flow, while potential energy is stored energy, such as in chemical bonds.

Question 2

A patient is exposed to a radioisotope for diagnostic imaging. Which property of radioisotopes makes them useful for this purpose?

Accepted Answer

They emit radiation as they decay to more stable forms, which can be detected.

Question 3

Which of the following elements is most abundant in the human body by mass and is essential for cellular respiration?

Accepted Answer

Oxygen

Question 4

A sodium atom (Na) reacts with a chlorine atom (Cl) to form sodium chloride (NaCl). What type of bond is formed, and what happens to the electrons?

Accepted Answer

An ionic bond is formed by the transfer of an electron from Na to Cl.

Question 5

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

Accepted Answer

Water molecules are polar, allowing them to surround and dissociate ions.

Question 6

A solution has a pH of 4. What is the concentration of hydrogen ions $$[H^+] in $$this solution?

Accepted Answer

$$[H^+] = 10$$^{-4}$$ \ 	ext{M}$$

Question 7

Which of the following statements about enzymes is correct?

Accepted Answer

Enzymes lower the activation energy required for a reaction.

Question 8

Which of the following best describes 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 9

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

Accepted Answer

They form the main structure of cell membranes due to their amphipathic nature.

Question 10

A patient is experiencing muscle cramps due to an electrolyte imbalance. Which ion is most likely involved, and why is it important?

Accepted Answer

Calcium; it is necessary for muscle contraction and nerve impulse transmission.

Question 11

Which of the following best describes the role of buffers in the human body?

Accepted Answer

Buffers resist changes in pH by binding or releasing hydrogen ions.

Question 12

Which of the following is true regarding the structure of DNA?

Accepted Answer

DNA contains deoxyribose sugar and the bases adenine, thymine, cytosine, and guanine.

Question 13

Which of the following reactions is an example of a dehydration synthesis reaction?

Accepted Answer

Joining two amino acids to form a dipeptide with the release of water.

Question 14

Which of the following best explains why enzymes are specific to their substrates?

Accepted Answer

The active site of an enzyme has a unique shape that fits only specific substrates.

Question 15

Which of the following best describes an exergonic reaction?

Accepted Answer

A reaction that releases energy and has products with less potential energy than reactants.

Question 16

Which of the following is a property of water that is critical for maintaining body temperature homeostasis?

Accepted Answer

High heat capacity

Question 17

Which of the following best describes the difference between a solution, a colloid, and a suspension?

Accepted Answer

Solutions have tiny particles that do not settle out; colloids have larger particles that scatter light; suspensions have very large particles that settle out.

Question 18

Which of the following best explains why carbon is the backbone of organic molecules?

Accepted Answer

Carbon can form up to four covalent bonds, allowing for a variety of complex structures.

Question 19

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

Accepted Answer

Carbohydrate – monosaccharide

Question 20

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

Accepted Answer

ATP provides immediate, usable energy for cellular work.

Chapter 2: Chemistry Comes Alive – Foundations for Anatomy & Physiology

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