Q: If a solution has a pH of 5, which statement is true about its hydrogen ion concentration?

It has a high concentration of H\textsuperscript{+} ions and is acidic.

Q: Which of the following is a correct description of a buffer in the human body?

A buffer maintains pH stability by neutralizing excess H\textsuperscript{+} or OH\textsuperscript{--} ions.

Q: A patient is diagnosed with acidosis. What does this indicate about their body fluid pH and ion concentration?

Low pH and excess H\textsuperscript{+} ions

Q: Which of the following is true about the relationship between hydrogen ion concentration and pH?

As H\textsuperscript{+} concentration increases, pH decreases.

Question 1

Which atomic particle is responsible for the atomic number of an element, and what is its charge?

Accepted Answer

Proton; positive charge

Question 2

A sodium atom (Na) has 11 protons and 12 neutrons. What is its mass number?

Accepted Answer

$$23$$

Question 3

Which type of chemical bond is formed by the sharing of electrons between atoms?

Accepted Answer

Covalent bond

Question 4

What is the main reason hydrogen bonds are important in biological molecules?

Accepted Answer

They hold large molecules together and contribute to unique properties of water.

Question 5

Which of the following best describes a decomposition reaction in physiology?

Accepted Answer

AB \rightarrow A + B

Question 6

If a solution has a pH of 5, which statement is true about its hydrogen ion concentration?

Accepted Answer

It has a high concentration of H	extsuperscript{+} ions and is acidic.

Question 7

Which of the following is a correct description of a buffer in the human body?

Accepted Answer

A buffer maintains pH stability by neutralizing excess H	extsuperscript{+} or OH	extsuperscript{--} ions.

Question 8

Which organic molecule is primarily used for quick energy and as a component of cell membranes?

Accepted Answer

Carbohydrates

Question 9

A fatty acid with one or more double bonds in its hydrocarbon chain is classified as:

Accepted Answer

Unsaturated

Question 10

Which of the following is NOT a function of proteins in the human body?

Accepted Answer

Energy storage

Question 11

What type of bond forms between the amino group of one amino acid and the carboxylic acid group of another?

Accepted Answer

Peptide bond

Question 12

Which protein structure level is defined by the sequence of amino acids in a polypeptide chain?

Accepted Answer

Primary structure

Question 13

Enzymes lower the activation energy of chemical reactions. Which equation best represents activation energy ($$E_a) in a $$reaction?

Accepted Answer

$$E_a = E_{transition\ state} - E_{reactants}$$

Question 14

Which statement about enzyme specificity is correct?

Accepted Answer

Each enzyme catalyzes only one specific reaction.

Question 15

A patient is diagnosed with acidosis. What does this indicate about their body fluid pH and ion concentration?

Accepted Answer

Low pH and excess H	extsuperscript{+} ions

Question 16

Which of the following reactions is an example of an exchange reaction?

Accepted Answer

AB + CD \leftrightarrow AD + CB

Question 17

Which of the following is a coenzyme?

Accepted Answer

A nonprotein organic molecule such as a vitamin

Question 18

A solution with a pH of 9 is considered:

Accepted Answer

Basic

Question 19

Which of the following best explains why water has a high surface tension?

Accepted Answer

Hydrogen bonds between neighboring water molecules

Question 20

Which of the following is true about the relationship between hydrogen ion concentration and pH?

Accepted Answer

As H	extsuperscript{+} concentration increases, pH decreases.

The Chemical Level of Organization: Foundations for Anatomy & Physiology

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