Extremadura PAU Biology Practice Questions - Extremadura PAU Biology Examination - UEx (Biología 2o Bachillerato 2026) Exam - Extremadura PAU Biology Practice Questions - Extremadura PAU Biology Examination

Question 1

Which physicochemical property of water enables homeothermic organisms to maintain a stable body temperature through sweat evaporation?

High heat of vaporization caused by extensive intermolecular hydrogen bonding. Low boiling point resulting from nonpolar covalent interactions. High density in the solid state relative to the liquid state. Low surface tension facilitating hydrophobic solute aggregation.

Correct Answer:

High heat of vaporization caused by extensive intermolecular hydrogen bonding.

Question 2

What happens to human erythrocytes when they are placed into a hypertonic sodium chloride solution?

They absorb water via osmosis until undergoing osmotic lysis (hemolysis). They lose water via osmosis to the external medium and undergo crenation (shriveling). They take up sodium ions by simple diffusion, causing an increase in cell volume. They remain morphologically unchanged because the cell membrane is completely impermeable to water.

Correct Answer:

They lose water via osmosis to the external medium and undergo crenation (shriveling).

Question 3

Which hexose monosaccharide serves as the primary metabolic fuel for cellular respiration in human tissues?

D-Ribose D-Galactose D-Glucose Fructose

Correct Answer:

D-Glucose

Question 4

Which chemical feature distinguishes unsaturated fatty acids from saturated fatty acids?

The presence of branched hydrocarbon chains with aldehyde functional groups. The presence of phosphate groups attached to the glycerol backbone. The complete absence of carboxylic acid functional groups at the terminal carbon. The presence of one or more carbon-carbon double bonds (C=C) in the hydrocarbon tail.

Correct Answer:

The presence of one or more carbon-carbon double bonds (C=C) in the hydrocarbon tail.

Question 5

What type of chemical covalent bond joins adjacent amino acid residues in a polypeptide chain?

Peptide bond (amide bond between alpha-carboxyl and alpha-amino groups). Glycosidic bond between hydroxyl groups. Phosphodiester bond between 3'-OH and 5'-phosphate groups. Ester bond between fatty acid carboxyl and glycerol hydroxyl groups.

Correct Answer:

Peptide bond (amide bond between alpha-carboxyl and alpha-amino groups).

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Prepare with the Extremadura PAU Biology Practice Questions - Extremadura PAU Biology Examination - UEx (Biología 2o Bachillerato 2026) Exam practice quiz. This question bank includes 100 questions covering structural, cells, eukaryotic, cycle, and enzyme. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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Extremadura PAU Biology Practice Questions - Extremadura PAU Biology Examination - UEx (Biología 2o Bachillerato 2026) Exam

This practice set contains 100 questions from the matching question bank and focuses on structural, cells, eukaryotic, cycle, and enzyme. 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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Extremadura PAU Biology Practice Questions - Extremadura PAU Biology Examination - UEx (Biología 2o Bachillerato 2026) Exam

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