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

$$[\mathrm{H}^+] = 1 \times 10$$^{-4}$$~\mathrm{M}$$

Question 1

Which of the following best describes the function of the lymphatic system in the human body?

Accepted Answer

It returns excess tissue fluid to the bloodstream and provides immune defense.

Question 2

A patient is experiencing rapid heart rate due to blood loss. Which type of feedback loop is primarily responsible for restoring homeostasis in this scenario?

Accepted Answer

Negative feedback loop

Question 3

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

Accepted Answer

Water molecules are polar and can surround and separate ions due to their partial charges.

Question 4

Which of the following equations correctly represents the dissociation of hydrochloric acid ($$\mathrm{HCl}) in $$water?

Accepted Answer

$$\mathrm{HCl} \rightarrow \mathrm{H}^+ + \mathrm{Cl}^-$$

Question 5

Which of the following best describes the difference between a covalent bond and an ionic bond?

Accepted Answer

Covalent bonds involve the sharing of electrons, while ionic bonds involve the transfer of electrons.

Question 6

A solution has a pH of 4. What is the hydrogen ion concentration $$[\mathrm{H}^+] in $$this solution?

Accepted Answer

$$[\mathrm{H}^+] = 1 	imes 10$$^{-4}$$~\mathrm{M}$$

Question 7

Which of the following best explains why enzymes are important in biological systems?

Accepted Answer

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

Question 8

Which of the following is an example of a positive feedback mechanism in the human body?

Accepted Answer

Blood clotting after a vessel injury

Question 9

Which of the following best describes the process of dehydration synthesis?

Accepted Answer

Joining monomers to form polymers by removing a molecule of water

Question 10

A buffer solution is prepared by mixing acetic acid ($$\mathrm{CH}_3\mathrm{COOH}) $$and sodium acetate ($$\mathrm{CH}_3\mathrm{COONa}). $$What is the primary function of this buffer in a biological system?

Accepted Answer

To maintain a constant pH by neutralizing added acids or bases

Question 11

Which of the following best explains why ice floats on liquid water?

Accepted Answer

Ice is less dense than liquid water because hydrogen bonds hold water molecules in a lattice structure.

Question 12

Which of the following is a correct statement about isotopes?

Accepted Answer

Isotopes have the same number of protons but different numbers of neutrons.

Question 13

Which of the following best describes the role of the respiratory system?

Accepted Answer

It exchanges gases between the blood and the external environment.

Question 14

Which of the following best explains the difference between endergonic and exergonic reactions?

Accepted Answer

Endergonic reactions absorb energy, while exergonic reactions release energy.

Question 15

Which of the following best describes the relationship between monomers and polymers?

Accepted Answer

Monomers are small molecules that join together to form polymers.

Question 16

Which of the following is a correct example of a hydrolysis reaction?

Accepted Answer

Sucrose + $$\mathrm{H}_2\mathrm{O}$$ $$\rightarrow$$ Glucose + Fructose

Question 17

A patient is diagnosed with metabolic acidosis. Which of the following best describes the change in their blood pH and hydrogen ion concentration?

Accepted Answer

Blood pH decreases and $$[\mathrm{H}^+]$$ increases.

Question 18

Which of the following best explains why carbon is able to form such a wide variety of organic molecules?

Accepted Answer

Carbon can form up to four covalent bonds with other atoms.

Question 19

Which of the following best describes the function of the nervous system?

Accepted Answer

It coordinates and controls body activities by transmitting electrical signals.

Question 20

Which of the following best explains the importance of hydrogen bonds in biological molecules?

Accepted Answer

Hydrogen bonds stabilize the three-dimensional structure of proteins and the double helix of DNA.

Fundamental Concepts in Anatomy & Physiology: Organ Systems, Chemistry, and Biochemistry

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