Question 1

Which of the following best illustrates the relationship between structure and function in the plasma membrane of a cell?

Accepted Answer

The plasma membrane is made of phospholipids with hydrophilic heads and hydrophobic tails, allowing it to form a bilayer that controls the movement of substances in and out of the cell.

Question 2

Which of the following is NOT a fundamental life process essential for maintaining homeostasis?

Accepted Answer

Fermentation

Question 3

A patient is experiencing muscle weakness due to an imbalance in sodium and potassium ions. Which type of feedback mechanism is most likely involved in restoring ion balance?

Accepted Answer

Negative feedback

Question 4

Which of the following best describes the difference between intracellular and extracellular fluid?

Accepted Answer

Extracellular fluid is found outside cells and contains higher concentrations of sodium ions, while intracellular fluid is found inside cells and contains higher concentrations of potassium ions.

Question 5

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 6

Given the atomic number ($$Z) $$and mass number ($$A) of an $$element, which formula correctly calculates the number of neutrons ($$N) in $$the atom?

Accepted Answer

$$N = A - Z$$

Question 7

Which of the following best explains why carbon is so versatile and important in organic molecules in the body?

Accepted Answer

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

Question 8

Which of the following is a correct comparison between covalent and ionic bonds?

Accepted Answer

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

Question 9

Which of the following best describes the law of conservation of energy in the context of chemical reactions in the body?

Accepted Answer

Energy is transferred or transformed, but the total amount of energy remains constant.

Question 10

A chemical reaction in the body requires an enzyme to lower the activation energy. Which equation best represents the effect of an enzyme on activation energy ($$E_a$$)?

Accepted Answer

$$E_{a,enzyme} \u003c E_{a,uncatalyzed}$$

Question 11

Which of the following is a correct example of a decomposition reaction in the body?

Accepted Answer

The breakdown of glycogen into glucose molecules.

Question 12

Which of the following best describes a buffer in body fluids?

Accepted Answer

A buffer resists changes in pH by neutralizing excess acids or bases.

Question 13

Which of the following is a correct statement about ATP (adenosine triphosphate) in cellular metabolism?

Accepted Answer

ATP stores energy in its phosphate bonds and releases energy when converted to ADP.

Question 14

Which of the following is a correct comparison between acids and bases in aqueous solutions?

Accepted Answer

Acids increase the concentration of hydrogen ions ($$[H^+]$$), while bases decrease it.

Question 15

Which of the following is a correct description of a reversible chemical reaction?

Accepted Answer

A reaction that can proceed in both forward and reverse directions, reaching equilibrium.

Question 16

Which of the following best describes the role of hydrogen bonds in water?

Accepted Answer

Hydrogen bonds contribute to water's high surface tension and ability to dissolve many substances.

Question 17

Which of the following is a correct statement about the relationship between monomers and polymers?

Accepted Answer

Polymers are large molecules made by joining together many monomers.

Question 18

Which of the following is a correct example of a protein's tertiary structure?

Accepted Answer

The overall three-dimensional shape formed by interactions between R groups of amino acids.

Question 19

Which of the following best explains why enzymes are highly specific in their action?

Accepted Answer

Enzymes have active sites that fit only specific substrates due to their unique three-dimensional structure.

Question 20

A patient is diagnosed with metabolic acidosis. Which of the following best describes the role of buffers in the patient's blood?

Accepted Answer

Buffers help maintain pH by neutralizing excess hydrogen ions ($$H^+$$), preventing dangerous drops in blood pH.

Anatomy & Physiology: Foundational Concepts and Chemical Basis of Life

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