Question 1

Which of the following best explains why carbon is considered a versatile element in organic molecules?

Accepted Answer

Carbon can form up to four covalent bonds, allowing for a variety of stable structures such as chains, branches, and rings.

Question 2

A dehydration reaction is essential in the synthesis of biological polymers. Which of the following correctly describes this process?

Accepted Answer

A dehydration reaction links two monomers together by removing a molecule of water: $$	ext{Monomer}_1 + 	ext{Monomer}_2 ightarrow 	ext{Polymer} + \mathrm{H}_2\mathrm{O}$$

Question 3

Which of the following statements about lipids is correct?

Accepted Answer

Lipids are hydrophobic molecules that do not mix well with water and are not formed from repeating monomer units.

Question 4

A triglyceride is formed by joining which of the following components?

Accepted Answer

One glycerol molecule and three fatty acid molecules through dehydration reactions.

Question 5

Which of the following best distinguishes saturated fats from unsaturated fats?

Accepted Answer

Saturated fats have no double bonds in their fatty acid chains, while unsaturated fats have at least one double bond.

Question 6

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

Accepted Answer

Catalyzing chemical reactions as enzymes.

Question 7

Steroids, such as cholesterol, are characterized by which structural feature?

Accepted Answer

A carbon skeleton consisting of four fused rings.

Question 8

Which of the following statements about carbohydrates is correct?

Accepted Answer

Monosaccharides are the monomers of carbohydrates and cannot be broken down into smaller sugars.

Question 9

Which of the following is an example of a disaccharide, and how is it formed?

Accepted Answer

Lactose, formed by joining glucose and galactose via a dehydration reaction.

Question 10

Which polysaccharide is used for energy storage in animals and where is it primarily found?

Accepted Answer

Glycogen, primarily found in liver and muscle cells.

Question 11

Proteins are polymers made from which type of monomer, and what type of bond links them?

Accepted Answer

Amino acids, linked by peptide bonds.

Question 12

The function of a protein is most directly determined by which of the following?

Accepted Answer

The three-dimensional shape resulting from its amino acid sequence.

Question 13

Which of the following best describes the structure of a nucleotide found in nucleic acids?

Accepted Answer

A five-carbon sugar, a phosphate group, and a nitrogen-containing base.

Question 14

Which of the following base pairing rules is correct for DNA?

Accepted Answer

Adenine (A) pairs with Thymine (T), and Guanine (G) pairs with Cytosine (C).

Question 15

Which of the following statements about RNA is true?

Accepted Answer

RNA contains the sugar ribose and uses uracil (U) instead of thymine (T).

Question 16

A patient is diagnosed with a genetic disorder that affects the structure of their hemoglobin protein. Which level of protein structure is most likely altered, leading to this disease?

Accepted Answer

The primary structure, which is the sequence of amino acids.

Question 17

Which of the following best explains why cellulose is not digestible by humans, even though it is made of glucose monomers?

Accepted Answer

Humans lack the enzymes to break the specific $$\beta-$$glycosidic bonds found in cellulose.

Question 18

During digestion, which chemical reaction is primarily responsible for breaking down macromolecules into their monomers?

Accepted Answer

Hydrolysis, which adds water to break bonds between monomers: $$	ext{Polymer} + \mathrm{H}_2\mathrm{O} ightarrow 	ext{Monomer}_1 + 	ext{Monomer}_2$$

Question 19

A scientist is studying a molecule with the formula $$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6. $$Which of the following statements is most accurate about this molecule?

Accepted Answer

It could be either glucose or fructose, which are isomers with the same formula but different structures.

Question 20

Which of the following best describes the relationship between monomers and polymers in biological macromolecules?

Accepted Answer

Polymers are long chains made by linking together many monomers through dehydration reactions.

Chapter 3: The Molecules of Life – Structure and Function of Biological Macromolecules

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