Q: A solution has a pH of 5. What is the hydrogen ion concentration $$[H^+] of $$this solution?

$$[H^+] = 1 \times 10$$^{-5}$$ \ \mathrm{M}$$

Question 1

Which of the following best describes the difference between a cation and an anion?

Accepted Answer

A cation is a positively charged ion formed when an atom loses electrons, while an anion is a negatively charged ion formed when an atom gains electrons.

Question 2

A solution has a pH of 5. What is the hydrogen ion concentration $$[H^+] of $$this solution?

Accepted Answer

$$[H^+] = 1 	imes 10$$^{-5}$$ \ \mathrm{M}$$

Question 3

Which of the following is a property of water that is critical for maintaining body temperature homeostasis?

Accepted Answer

Water has a high heat capacity, allowing it to absorb heat without significant temperature change.

Question 4

Which of the following best explains why oils do not dissolve in water?

Accepted Answer

Oils are nonpolar and hydrophobic, so they do not interact with water's polar molecules.

Question 5

A patient is diagnosed with phenylketonuria, a disorder caused by a deficiency in the enzyme phenylalanine hydroxylase. What is the most direct consequence of this deficiency?

Accepted Answer

Accumulation of phenylalanine and decreased production of tyrosine.

Question 6

Which of the following statements about the octet rule is correct?

Accepted Answer

Atoms are most stable when their outermost shell contains 8 electrons.

Question 7

Which of the following best describes the role of enzymes in biological reactions?

Accepted Answer

Enzymes decrease the activation energy, speeding up reactions without being consumed.

Question 8

Which of the following is an example of a catabolic reaction?

Accepted Answer

The breakdown of a protein into amino acids.

Question 9

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

Accepted Answer

DNA is double-stranded and contains deoxyribose; RNA is single-stranded and contains ribose.

Question 10

A solution is made by dissolving 10 grams of glucose in 100 mL of water. In this solution, which is the solute and which is the solvent?

Accepted Answer

Glucose is the solute; water is the solvent.

Question 11

Which of the following best explains why blood is considered a suspension?

Accepted Answer

Blood contains large, unevenly distributed particles that settle out when undisturbed.

Question 12

Which of the following is true regarding the structure of a phospholipid?

Accepted Answer

It contains a glycerol backbone, two fatty acid tails, and a phosphate head.

Question 13

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

Accepted Answer

The sequence of amino acids in the polypeptide chain.

Question 14

Which of the following is a correct example of complementary base pairing in DNA?

Accepted Answer

Adenine pairs with thymine, guanine pairs with cytosine.

Question 15

Which of the following best describes an exchange reaction?

Accepted Answer

Atoms from reactants are exchanged to form new products.

Question 16

Which of the following is a property of a buffer system in the human body?

Accepted Answer

It resists changes in pH by neutralizing added acids or bases.

Question 17

Which of the following best describes the difference between a polar and a nonpolar covalent bond?

Accepted Answer

Polar covalent bonds involve unequal sharing of electrons, while nonpolar covalent bonds involve equal sharing.

Question 18

Which of the following is a real-life application of radioisotopes in medicine?

Accepted Answer

They are used as radiotracers to diagnose and treat diseases such as cancer.

Question 19

Which of the following best describes the process of hydrolysis?

Accepted Answer

It breaks polymers into smaller subunits using water.

Question 20

Which of the following statements about saturated and unsaturated fatty acids is correct?

Accepted Answer

Unsaturated fatty acids have one or more double bonds and are generally liquid at room temperature.

The Chemistry of Life: Foundations for Anatomy & Physiology

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