Question 1

Which of the following best describes the difference between saturated and unsaturated fats at the molecular level?

Accepted Answer

Saturated fats have only single bonds between carbon atoms, while unsaturated fats have one or more double bonds.

Question 2

A patient is diagnosed with high levels of LDL cholesterol. Which of the following is a likely health risk associated with this condition?

Accepted Answer

Increased risk of cardiovascular disease

Question 3

Which of the following is a correct pairing of a macromolecule and its monomer?

Accepted Answer

Carbohydrate – Monosaccharide

Question 4

Which of the following best explains why cellulose is indigestible by most animals?

Accepted Answer

Cellulose contains beta-glycosidic linkages that most animals lack enzymes to hydrolyze.

Question 5

A scientist is analyzing a molecule with the following structure: a phosphate group, a glycerol backbone, and two fatty acid chains. Which type of molecule is this?

Accepted Answer

Phospholipid

Question 6

Which of the following statements about DNA and RNA is correct?

Accepted Answer

DNA contains the base thymine, while RNA contains uracil.

Question 7

Which of the following best describes the primary function of enzymes in biological systems?

Accepted Answer

Enzymes act as catalysts to speed up chemical reactions by lowering activation energy.

Question 8

A mutation causes a change in the primary structure of a protein. Which level of protein structure is directly affected by this mutation?

Accepted Answer

Primary structure

Question 9

Which of the following equations correctly represents the hydrolysis of a disaccharide into two monosaccharides?

Accepted Answer

$C_{12}H_{22}O_{11} + H_2O \rightarrow 2C_6H_{12}O_6$

Question 10

Which of the following best describes the role of phospholipids in cell membranes?

Accepted Answer

They form a bilayer with hydrophilic heads facing outward and hydrophobic tails facing inward, creating a semi-permeable membrane.

Question 11

A geneticist is comparing the genomes of two closely related species. Which field of study does this work fall under?

Accepted Answer

Genomics

Question 12

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

Accepted Answer

Catalyzing biochemical reactions

Question 13

Which of the following best explains why trans fats are considered unhealthy?

Accepted Answer

They increase LDL cholesterol and decrease HDL cholesterol, raising the risk of heart disease.

Question 14

Which of the following best describes the structure of a nucleotide?

Accepted Answer

A phosphate group, a pentose sugar, and a nitrogenous base

Question 15

A researcher is studying the proteome of a cell. What is the focus of this research?

Accepted Answer

The complete set of proteins expressed by the cell

Question 16

Which of the following best explains the importance of the sequence of amino acids in a protein?

Accepted Answer

It determines the protein's three-dimensional structure and function.

Question 17

Which of the following is a correct statement about the relationship between genomics and proteomics?

Accepted Answer

Genomics and proteomics both analyze large-scale biological data, but genomics focuses on genes and proteomics on proteins.

Question 18

Which of the following best describes the function of cholesterol in animal cell membranes?

Accepted Answer

It helps maintain membrane fluidity and stability.

Question 19

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

Accepted Answer

Joining monomers to form polymers by removing a molecule of water

Question 20

A patient is found to have a genetic disorder caused by a mutation in a gene encoding an enzyme. Which of the following best explains how this mutation could lead to disease?

Accepted Answer

The mutation changes the enzyme's amino acid sequence, altering its shape and preventing it from catalyzing its specific reaction.

Macromolecules and Their Biological Functions: Study Notes for General Biology

Study Guide - Practice Questions

Study Guide - Flashcards