Question 1

Which of the following best describes the four major classes of biomolecules found in all living organisms?

Accepted Answer

Carbohydrates, nucleic acids, proteins, and lipids

Question 2

Which property of carbon makes it especially important in the formation of biomolecules?

Accepted Answer

It can form four covalent bonds with other atoms

Question 3

A disaccharide is formed when two monosaccharides undergo which type of reaction?

Accepted Answer

Dehydration synthesis

Question 4

Which of the following is the correct empirical formula for most carbohydrates?

Accepted Answer

$$C_n(H_2O)_n$$

Question 5

Which of the following statements about phospholipids is correct?

Accepted Answer

They have a hydrophilic head and hydrophobic tails

Question 6

A patient is diagnosed with a genetic disorder that affects the structure of their glycoproteins. Which cellular process is most likely to be directly impacted?

Accepted Answer

Cell-cell recognition and signaling

Question 7

Which of the following best explains why unsaturated fatty acids are typically liquid at room temperature?

Accepted Answer

The presence of double bonds creates kinks, preventing tight packing

Question 8

Which of the following is a function of nucleotides in cells, aside from being building blocks of nucleic acids?

Accepted Answer

Acting as energy currency in metabolic transactions (e.g., ATP)

Question 9

A scientist isolates a biomolecule with the following properties: insoluble in water, contains long hydrocarbon chains, and is used for energy storage. Which class of biomolecule is this most likely to be?

Accepted Answer

Lipid

Question 10

Which of the following best describes the role of the Golgi apparatus in a eukaryotic cell?

Accepted Answer

Sorting, tagging, packaging, and distribution of proteins

Question 11

Which of the following is a correct statement about the structure of amino acids?

Accepted Answer

They have a central carbon atom bonded to an amino group, a carboxyl group, a hydrogen atom, and a variable R group

Question 12

Which of the following best explains why cellulose cannot be digested by humans, while starch can?

Accepted Answer

Humans lack the enzyme to break the $$\beta-1$$,4-glycosidic bonds in cellulose

Question 13

A mutation causes a change in the number of protons in an atom. What is the result of this change?

Accepted Answer

The atom becomes a different element

Question 14

Which of the following best describes the function of lysosomes in animal cells?

Accepted Answer

They contain enzymes that digest proteins, polysaccharides, lipids, nucleic acids, and worn-out organelles

Question 15

Which of the following is a correct description of the nuclear envelope?

Accepted Answer

It is a double-membrane structure with pores that control the passage of ions, molecules, and RNA

Question 16

Which of the following best explains the amphipathic nature of phospholipids and its importance in biological membranes?

Accepted Answer

Phospholipids have both hydrophilic and hydrophobic regions, allowing them to form bilayers that act as barriers to polar molecules

Question 17

A researcher is studying a molecule that consists of a long chain of amino acids joined by peptide bonds. Which level of protein structure is being described?

Accepted Answer

Primary structure

Question 18

Which of the following best describes the function of mitochondria in eukaryotic cells?

Accepted Answer

They are responsible for producing ATP through cellular respiration

Question 19

Which of the following is a real-world example of the importance of post-translational modifications in proteins?

Accepted Answer

Insulin must be cleaved and folded correctly after translation to become active in regulating blood sugar

Question 20

Which of the following best explains why water is essential for the structure and function of biomolecules in living organisms?

Accepted Answer

Water acts as a solvent, facilitating chemical reactions and maintaining the structure of macromolecules through hydrogen bonding

Biomolecules: The Chemical Basis of Life

Guida di studio - Domande di pratica

Study guide - Flashcard