Question 1

Which of the following best describes an ion?

Accepted Answer

An atom that has gained or lost electrons, resulting in a net electrical charge.

Question 2

A patient is found to have a blood pH of 7.1. Which of the following best describes this condition and its potential consequences?

Accepted Answer

The blood is acidic, which can damage cells and tissues by disrupting chemical bonds and protein shapes.

Question 3

Which of the following statements about water is correct?

Accepted Answer

Water is the only molecule on Earth that exists naturally in all three states: solid, liquid, and gas.

Question 4

Which of the following best explains why sodium (Na) and chlorine (Cl) form an ionic bond?

Accepted Answer

Sodium donates an electron to chlorine, resulting in oppositely charged ions that attract each other.

Question 5

A molecule of glucose ($$C_6H_{12}O_6$) is classified as which type of macromolecule, and what is its primary function in the body?

Accepted Answer

Carbohydrate; immediate energy source

Question 6

Which of the following is a correct representation of a decomposition reaction, and what is its significance in human physiology?

Accepted Answer

$$AB \rightarrow A + B$$; it is important for breaking down nutrients during digestion.

Question 7

Which of the following best describes the role of enzymes in chemical reactions within the body?

Accepted Answer

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

Question 8

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

Accepted Answer

Proteins are composed of amino acids linked by peptide bonds, and their function depends on their three-dimensional shape.

Question 9

Which of the following best explains why a saturated fatty acid is solid at room temperature, while an unsaturated fatty acid is liquid?

Accepted Answer

Unsaturated fatty acids have double bonds that create kinks, preventing tight packing and making them liquid.

Question 10

A solution has a hydrogen ion concentration of $$1 	imes 10$$^{-9}$$ M. What is the pH of this solution, and is it acidic, neutral, or basic?

Accepted Answer

pH = 9; basic

Question 11

Which of the following best describes the difference between DNA and RNA?

Accepted Answer

DNA is usually double-stranded and contains thymine, while RNA is usually single-stranded and contains uracil.

Question 12

Which of the following is a correct example of a dehydration synthesis reaction?

Accepted Answer

Joining two monosaccharides to form a disaccharide with the removal of a water molecule.

Question 13

Which of the following elements is NOT one of the four most abundant elements in the human body?

Accepted Answer

Calcium

Question 14

A patient is experiencing muscle cramps due to an electrolyte imbalance. Which of the following ions is most likely involved, and why are electrolytes important in physiology?

Accepted Answer

Potassium; electrolytes are important for conducting electrical currents in nerve and muscle cells.

Question 15

Which of the following best describes the relationship between ATP and ADP in cellular energy transfer?

Accepted Answer

ATP is formed from ADP by the addition of a phosphate group, storing energy that can be released when ATP is converted back to ADP.

Question 16

Which of the following best explains why proteins denature at high temperatures?

Accepted Answer

High temperatures disrupt hydrogen bonds and other interactions, causing the protein to lose its three-dimensional shape and function.

Question 17

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 18

Which of the following best describes a polar covalent bond?

Accepted Answer

A bond in which electrons are shared unequally, resulting in partial charges on the atoms.

Question 19

Which of the following best explains the importance of hydrogen bonds in water?

Accepted Answer

Hydrogen bonds are responsible for water's high surface tension and its ability to act as a solvent.

Question 20

A molecule has the formula $$C_{16}H$$_{32}$$O_2. It is $$insoluble in water and is used for long-term energy storage. To which class of macromolecules does it belong?

Accepted Answer

Lipids

Chemistry Fundamentals for Anatomy & Physiology I

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