Catalonia PAU Biology Practice Questions - Catalonia PAU Biology Examination - CIC Generalitat de Catalunya (Biologia 2n Batxillerat 2026) Exam - Catalonia PAU Biology Practice Questions - Catalonia PAU Biology Examination - CIC Generalitat de Catalunya (Biologia 2n Batxillerat 2026) Exam

Question 1

Which physicochemical property of water allows humans and other mammals to release excess body heat effectively during sweating?

High heat of vaporization resulting from extensive intermolecular hydrogen bonding. Low boiling point caused by nonpolar covalent bonds within the water molecule. High density in the solid phase compared to the liquid phase. Low surface tension facilitating rapid hydrophobic evaporation.

Correct Answer:

High heat of vaporization resulting from extensive intermolecular hydrogen bonding.

Question 2

What happens to human red blood cells (erythrocytes) when placed in a hypertonic sodium chloride solution?

Water moves out of the cells by osmosis, causing them to shrink and undergo crenation. Water enters the cells by osmosis until they swell and burst in a process called hemolysis. Sodium ions rapidly diffuse into the cells by simple diffusion, causing cell swelling. The cells maintain a constant volume because the plasma membrane is impermeable to water.

Correct Answer:

Water moves out of the cells by osmosis, causing them to shrink and undergo crenation.

Question 3

Which structural feature distinguishes D-glucose from D-fructose?

D-glucose is an aldohexose with a carbonyl group at C1, whereas D-fructose is a ketohexose with a carbonyl group at C2. D-glucose is a pentose sugar found in RNA, whereas D-fructose is a hexose sugar found in plant cell walls. D-glucose contains beta-1,4-glycosidic linkages, whereas D-fructose contains alpha-1,4-glycosidic linkages. glucose is a non-reducing sugar, whereas D-fructose cannot undergo ring closure in aqueous solution.

Correct Answer:

D-glucose is an aldohexose with a carbonyl group at C1, whereas D-fructose is a ketohexose with a carbonyl group at C2.

Question 4

Which chemical reaction forms a triglyceride (triacylglycerol) from glycerol and fatty acid molecules?

Esterification of three fatty acid carboxyl groups with three glycerol hydroxyl groups, releasing three water molecules. Hydrolysis of peptide bonds between amino acid residues in the presence of acidic catalysts. Condensation of three phosphate groups with the nitrogenous base adenosine to form high-energy bonds. Hydrogenation of unsaturated carbon-carbon double bonds to produce branched sphingolipids.

Correct Answer:

Esterification of three fatty acid carboxyl groups with three glycerol hydroxyl groups, releasing three water molecules.

Question 5

Which functional groups react during the formation of a peptide bond between two amino acids?

The alpha-carboxyl group of one amino acid and the alpha-amino group of another amino acid. The variable R-group side chain of a hydrophobic amino acid and a phosphate group. The hydroxyl group of a serine residue and the methyl group of an alanine residue. The aldehyde group of a reduced sugar and the imidazole ring of a histidine residue.

Correct Answer:

The alpha-carboxyl group of one amino acid and the alpha-amino group of another amino acid.

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Prepare with the Catalonia PAU Biology Practice Questions - Catalonia PAU Biology Examination - CIC Generalitat de Catalunya (Biologia 2n Batxillerat 2026) Exam practice quiz. This question bank includes 100 questions covering cells, cycle, acid, eukaryotic, and protein. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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Catalonia PAU Biology Practice Questions - Catalonia PAU Biology Examination - CIC Generalitat de Catalunya (Biologia 2n Batxillerat 2026) Exam

This practice set contains 100 questions from the matching question bank and focuses on cells, cycle, acid, eukaryotic, and protein. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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Catalonia PAU Biology Practice Questions - Catalonia PAU Biology Examination - CIC Generalitat de Catalunya (Biologia 2n Batxillerat 2026) Exam

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