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 muscle contraction, while potential energy is stored energy, such as in ATP molecules.

Question 2

A solution is prepared by dissolving 10 grams of glucose (C$$_6H$_{12}O$_6) in $$enough water to make 1 liter of solution. What is the molarity (M) of the solution? (Molecular weight of glucose = 180 g/mol)

Accepted Answer

$$0.056\ 	ext{M}$$

Question 3

Which of the following statements about isotopes is correct?

Accepted Answer

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

Question 4

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

Accepted Answer

Water has a V-shaped structure with unequal sharing of electrons, resulting in partial positive and negative charges.

Question 5

A patient is given a saline solution intravenously. Which type of mixture is this solution, and why?

Accepted Answer

Solution, because the solute particles are very tiny and do not settle out or scatter light.

Question 6

Which of the following is a correct statement about the octet rule and its significance in chemical bonding?

Accepted Answer

Atoms are most stable when they have 8 electrons in their outermost (valence) shell, leading to the formation of chemical bonds.

Question 7

Which of the following best describes the difference between ionic and covalent bonds?

Accepted Answer

Ionic bonds involve the transfer of electrons from one atom to another, resulting in charged ions, while covalent bonds involve the sharing of electrons between atoms.

Question 8

Which of the following is an example of a hydrogen bond in the human body?

Accepted Answer

The attraction between the slightly positive hydrogen of one water molecule and the slightly negative oxygen of another water molecule.

Question 9

A chemical reaction in the body combines glucose and oxygen to form carbon dioxide, water, and energy. Which type of reaction is this, and what is its physiological significance?

Accepted Answer

Decomposition reaction; it breaks down glucose to release energy for cellular work.

Question 10

Which of the following factors would increase the rate of a chemical reaction in the human body?

Accepted Answer

Increasing the temperature and adding a catalyst (enzyme).

Question 11

A buffer system in the blood helps maintain pH homeostasis. Which of the following best describes how a buffer works?

Accepted Answer

A buffer resists changes in pH by binding or releasing hydrogen ions as needed.

Question 12

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

Accepted Answer

Enzymes act as biological catalysts, lowering the activation energy and speeding up chemical reactions without being consumed.

Question 13

Which of the following is a property of water that is critical for its role in the human body?

Accepted Answer

Excellent solvent properties, allowing it to dissolve many substances.

Question 14

A patient with a blood pH of 6.8 is experiencing which of the following conditions?

Accepted Answer

Acidosis

Question 15

Which of the following best describes the structure of a phospholipid and its importance in cell membranes?

Accepted Answer

Phospholipids have a hydrophilic head and hydrophobic tails, forming a bilayer that is the basis of cell membranes.

Question 16

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

Accepted Answer

Carbohydrate – Monosaccharide

Question 17

Which of the following best explains why saturated fats are solid at room temperature while unsaturated fats are liquid?

Accepted Answer

Unsaturated fats have double bonds that create kinks, preventing tight packing and making them liquid at room temperature.

Question 18

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

Accepted Answer

The sequence of amino acids in a polypeptide chain.

Question 19

Which of the following statements about ATP (adenosine triphosphate) is correct?

Accepted Answer

ATP stores energy in its high-energy phosphate bonds, which can be hydrolyzed to release energy for cellular work.

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

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