$$[H^+] = 1 \times 10$$^{-4}$$ \ \text{M}$$

Question 1

Which of the following best describes the difference between a molecule and a compound?

Accepted Answer

A molecule is formed by the combination of two or more atoms, while a compound is a molecule composed of two or more different elements.

Question 2

Which of the following statements about covalent bonds is correct?

Accepted Answer

Covalent bonds involve the sharing of electrons between atoms.

Question 3

A solution has a pH of 4. What is the concentration of hydrogen ions $$[H^+] in $$this solution?

Accepted Answer

$$[H^+] = 1 	imes 10$$^{-4}$$ \ 	ext{M}$$

Question 4

Which of the following best explains why water is an excellent solvent for ionic compounds?

Accepted Answer

Water is a polar molecule, so it can surround and separate ions due to its partial charges.

Question 5

Which of the following functional groups is found in both proteins and nucleic acids?

Accepted Answer

Amino group $$(-NH_2$)$$

Question 6

Which of the following best describes the process of dehydration synthesis?

Accepted Answer

It is the process by which monomers are joined to form polymers, releasing water as a byproduct.

Question 7

A patient is diagnosed with acidosis. Which of the following pH values would most likely be found in their blood?

Accepted Answer

pH = 6.8

Question 8

Which of the following is a correct statement about the structure of phospholipids and their role in biological membranes?

Accepted Answer

Phospholipids have both hydrophilic heads and hydrophobic tails, allowing them to form bilayers that make up cell membranes.

Question 9

Which of the following best explains why cellulose is not digestible by most animals?

Accepted Answer

Most animals lack the enzyme required to break the beta-glycosidic bonds in cellulose.

Question 10

Which of the following is NOT a component of a nucleotide?

Accepted Answer

Fatty acid

Question 11

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

Accepted Answer

Denaturation

Question 12

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 13

Which of the following best explains the role of ATP in cellular metabolism?

Accepted Answer

ATP stores and releases energy by breaking the bond between its second and third phosphate groups.

Question 14

Which of the following is a correct description of a hydrogen bond?

Accepted Answer

A weak attraction between a hydrogen atom covalently bonded to one molecule and an oxygen or nitrogen atom on another molecule.

Question 15

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

Accepted Answer

The association of two or more polypeptide chains to form a functional protein.

Question 16

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

Accepted Answer

They are used as tracers in diagnostic imaging to track the movement of substances in the body.

Question 17

Which of the following best explains why phospholipids are considered amphipathic molecules?

Accepted Answer

They have both hydrophilic (water-attracting) heads and hydrophobic (water-repelling) tails.

Question 18

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

Accepted Answer

$$A + B \rightarrow AB$$

Question 19

Which of the following statements about enzymes is correct?

Accepted Answer

Enzymes are biological catalysts that speed up chemical reactions without being consumed.

Chapter 2:The Chemistry of Biology: -Book Notes

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