Question 1

Which of the following statements correctly describes the difference between saturated and unsaturated fatty acids in terms of their chemical structure and physical properties?

Accepted Answer

Saturated fatty acids have no double bonds and are typically solid at room temperature, while unsaturated fatty acids have one or more double bonds and are usually liquid at room temperature.

Question 2

A dehydration reaction is crucial in the synthesis of biological polymers. Which equation best represents the dehydration reaction between two glucose molecules to form maltose?

Accepted Answer

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

Question 3

Which of the following best explains why cellulose is indigestible to most animals, including humans?

Accepted Answer

Cellulose contains $\beta$-glycosidic linkages, and humans lack enzymes to hydrolyze these bonds.

Question 4

Which of the following is NOT a function of proteins in living organisms?

Accepted Answer

Storing hereditary information

Question 5

A patient is diagnosed with sickle-cell disease. Which molecular change is responsible for the altered shape of red blood cells in this condition?

Accepted Answer

A single amino acid substitution in the primary structure of hemoglobin

Question 6

Which of the following correctly matches the macromolecule with its monomer?

Accepted Answer

Nucleic acid – Nucleotide

Question 7

Phospholipids are essential components of cell membranes. What property allows them to form bilayers in aqueous environments?

Accepted Answer

They have hydrophilic heads and hydrophobic tails, causing them to self-assemble into bilayers.

Question 8

Which of the following best describes the difference between starch and cellulose?

Accepted Answer

Starch has $\alpha$-glycosidic linkages, making it helical, while cellulose has $\beta$-glycosidic linkages, making it straight and unbranched.

Question 9

Which of the following is a correct statement about the structure of DNA?

Accepted Answer

DNA consists of two antiparallel polynucleotide strands forming a double helix.

Question 10

A scientist is studying the process of hydrolysis in biological systems. Which equation best represents the hydrolysis of sucrose?

Accepted Answer

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

Question 11

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

Accepted Answer

Structural support in fungal cell walls and arthropod exoskeletons

Question 12

Which of the following best describes the role of enzymes in biological systems?

Accepted Answer

Enzymes are catalytic proteins that speed up chemical reactions without being consumed.

Question 13

Which of the following correctly describes the primary structure of a protein?

Accepted Answer

The sequence of amino acids in the polypeptide chain

Question 14

Which of the following is a consequence of denaturation in proteins?

Accepted Answer

The protein loses its native structure and biological activity.

Question 15

Which of the following is a correct pairing of nitrogenous bases in DNA?

Accepted Answer

Adenine pairs with thymine

Question 16

Which of the following is true about the flow of genetic information in eukaryotic cells?

Accepted Answer

DNA is transcribed into mRNA, which is then translated into protein.

Question 17

Which of the following best explains why lipids are not considered true polymers?

Accepted Answer

Lipids are assembled from smaller molecules but do not consist of repeating monomer units.

Question 18

Which of the following is a correct description of a phosphodiester linkage in nucleic acids?

Accepted Answer

A bond between the phosphate group of one nucleotide and the sugar of another nucleotide

Question 19

Which of the following is a real-world application of genomics and proteomics in biology?

Accepted Answer

Analyzing large sets of genes and proteins to understand evolutionary relationships and disease mechanisms

The Structure and Function of Biological Molecules

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