Question 1

Which of the following best describes a dehydration synthesis reaction?

Accepted Answer

A reaction in which two monomers are joined together by removing a molecule of water.

Question 2

Which of the following is NOT one of the four main classes of large biological molecules?

Accepted Answer

Vitamins

Question 3

A student is analyzing a molecule with the following features: it is composed of many glucose units joined by glycosidic bonds, is highly branched, and is found in animal muscle and liver. Which molecule is the student most likely studying?

Accepted Answer

Glycogen

Question 4

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

Accepted Answer

Saturated fatty acids have only single bonds between carbon atoms, allowing them to pack tightly.

Question 5

Which type of bond links monosaccharides together in the polysaccharide starch?

Accepted Answer

Glycosidic bond

Question 6

During digestion, enzymes in the digestive tract break down polymers into monomers. What type of reaction is this?

Accepted Answer

Hydrolysis

Question 7

Which of the following best explains why trans fats are considered harmful to human health?

Accepted Answer

They are associated with an increased risk of coronary heart disease.

Question 8

A phospholipid molecule is described as amphipathic. What does this mean?

Accepted Answer

It contains both hydrophilic and hydrophobic regions.

Question 9

Which of the following is a correct example of a monomer and its corresponding polymer?

Accepted Answer

Glucose and starch

Question 10

Which functional groups are involved in the formation of a triglyceride during a dehydration reaction?

Accepted Answer

One hydroxyl and one carboxyl group

Question 11

A patient is advised to reduce their intake of saturated fats. Which of the following foods should they limit based on the chemical properties of saturated fats?

Accepted Answer

Butter

Question 12

Which of the following statements about cellulose is correct?

Accepted Answer

It is composed of glucose monomers joined by glycosidic bonds.

Question 13

Which of the following best describes the difference between a monomer and a polymer?

Accepted Answer

A monomer is a single building block, while a polymer is a chain of many monomers joined together.

Question 14

Which of the following is a function of carbohydrates in living organisms?

Accepted Answer

Providing energy storage and structural support

Question 15

A scientist is studying a lipid molecule that contains four fused rings and is a precursor to hormones. Which class of lipid is this molecule most likely to belong to?

Accepted Answer

Steroids

Question 16

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

Accepted Answer

They contain double bonds that create kinks, preventing tight packing.

Question 17

Which of the following is a correct description of a glycosidic linkage?

Accepted Answer

A covalent bond between two monosaccharides formed by a dehydration reaction.

Question 18

A food manufacturer wants to convert liquid vegetable oil into a solid fat for use in baked goods. Which chemical process would they use, and what is a potential health risk associated with the resulting product?

Accepted Answer

Hydrogenation; increased risk of coronary heart disease due to trans fats

Question 19

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

Accepted Answer

Phospholipids have both hydrophilic heads and hydrophobic tails, enabling the formation of bilayers in cell membranes.

Question 20

A patient with a diet high in trans fats is at increased risk for which of the following conditions, according to epidemiological studies?

Accepted Answer

Coronary heart disease

Carbohydrates and Lipids: Structure, Function, and Biological Importance

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