Question 1

Which of the following best explains why water is an effective temperature buffer in the human body?

Accepted Answer

Water has a high heat capacity, allowing it to absorb and release large amounts of heat with little temperature change.

Question 2

A patient is found to have a blood pH of 6.8. Which of the following statements is most accurate regarding this condition?

Accepted Answer

The patient is experiencing acidosis, which can be life-threatening if not corrected.

Question 3

Which of the following best describes the difference between a saturated and an unsaturated fatty acid?

Accepted Answer

A saturated fatty acid contains only single covalent bonds between carbon atoms, while an unsaturated fatty acid contains one or more double bonds.

Question 4

Which of the following chemical reactions is an example of a decomposition reaction in the body?

Accepted Answer

The breakdown of glycogen to release glucose molecules.

Question 5

A molecule of DNA contains the following components EXCEPT:

Accepted Answer

Uracil

Question 6

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

Accepted Answer

They lower the activation energy required for a reaction to proceed.

Question 7

Which of the following statements about ionic bonds is correct?

Accepted Answer

Ionic bonds involve the transfer of electrons from one atom to another, resulting in the formation of charged ions.

Question 8

A solution has a hydrogen ion concentration of $$1 	imes 10$$^{-4}$$ M. What is the pH of this solution?

Accepted Answer

$$4$$

Question 9

Which of the following best explains why phospholipids are essential components of cell membranes?

Accepted Answer

They have both hydrophilic heads and hydrophobic tails, allowing them to form bilayers that separate aqueous environments.

Question 10

Which of the following is a correct statement about the structure of proteins?

Accepted Answer

The primary structure is the linear sequence of amino acids in the polypeptide chain.

Question 11

A patient is given a radioactive isotope for imaging. Which property of radioisotopes makes them useful for this purpose?

Accepted Answer

They emit detectable energy as they decay to more stable forms.

Question 12

Which of the following best describes the process of hydrolysis in the body?

Accepted Answer

It is the breakdown of polymers into monomers by the addition of water.

Question 13

Which of the following is a function of buffers in the human body?

Accepted Answer

Buffers resist abrupt changes in pH by binding or releasing hydrogen ions.

Question 14

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

Accepted Answer

DNA contains deoxyribose and thymine, while RNA contains ribose and uracil.

Question 15

Which of the following is an example of an exergonic reaction in the body?

Accepted Answer

The hydrolysis of ATP to ADP and inorganic phosphate, releasing energy.

Question 16

A molecule of ATP is hydrolyzed in a muscle cell. Which equation correctly represents this reaction?

Accepted Answer

$$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} ightarrow \mathrm{ADP} + \mathrm{P}_i + 	ext{energy}$$

Question 17

Which of the following best explains why enzymes are specific to their substrates?

Accepted Answer

The active site of an enzyme has a unique shape that fits only specific substrate molecules.

Question 18

Which of the following statements about acids and bases is correct?

Accepted Answer

Acids are proton donors that release $$\mathrm{H}^+$$ ions in solution.

Question 19

A protein is exposed to high heat and loses its three-dimensional structure. What is this process called, and what is a likely consequence?

Accepted Answer

Denaturation; the protein loses its function because the active site is deactivated.

Chemistry Comes Alive: Foundations for Anatomy & Physiology

Guida di studio - Domande di pratica