Basque PAU Biology Practice Questions - Basque Country PAU Biology Examination - UPV EHU (2o Bachillerato 2026) Exam - Basque PAU Biology Practice Questions - Basque Country PAU Biology Examination

Question 1

Why does liquid water have an exceptionally high specific heat capacity compared to other small covalent molecules?

Extensive intermolecular hydrogen bonding absorbs thermal energy before increasing kinetic movement. Covalent bonds within water molecules continuously break and reform at room temperature. Water molecules form ionic complexes that retain thermal kinetic energy efficiently. High molecular mass allows water to store vast amounts of rotational kinetic energy.

Correct Answer:

Extensive intermolecular hydrogen bonding absorbs thermal energy before increasing kinetic movement.

Question 2

Which physical property of water enables continuous sap transport against gravity in xylem vessels of tall plants?

Low surface tension and high compressibility High cohesion and adhesion combined with high tensile strength Maximal density at 4 degrees Celsius and low viscosity High dielectric constant and low specific heat capacity

Correct Answer:

High cohesion and adhesion combined with high tensile strength

Question 3

What happens to a plant cell when it is placed into a hypertonic salt solution?

Water enters the vacuole causing the cell to burst via osmotic lysis. Sodium ions enter the cell via simple diffusion until turgor pressure stabilizes. Water leaves the central vacuole causing the plasma membrane to detach from the cell wall (plasmolysis). Solute equilibrium is maintained with no net movement of water across the membrane.

Correct Answer:

Water leaves the central vacuole causing the plasma membrane to detach from the cell wall (plasmolysis).

Question 4

Which functional group distinction differentiates an aldose monosaccharide like D-glucose from a ketose like D-fructose?

An aldose cannot form D and L enantiomeric isomers, whereas a ketose can. An aldose has carboxylic acid groups, whereas a ketose contains ester linkages. An aldose forms ring structures with five atoms, whereas a ketose forms rings with seven atoms. An aldose contains a carbonyl group at carbon-1 (aldehyde), whereas a ketose contains a carbonyl at carbon-2 (ketone).

Correct Answer:

An aldose contains a carbonyl group at carbon-1 (aldehyde), whereas a ketose contains a carbonyl at carbon-2 (ketone).

Question 5

Why is sucrose considered a non-reducing disaccharide, unlike maltose and lactose?

The glycosidic bond involves the anomeric carbons of both glucose (alpha-1) and fructose (beta-2), leaving no free anomeric hydroxyl group. Sucrose lacks hydroxyl groups capable of participating in oxidation-reduction reactions. Sucrose is composed exclusively of beta-D-galactose monomers joined by beta-1,4-bonds. Sucrose spontaneously hydrolyzes into free carboxylic acids in aqueous solution.

Correct Answer:

The glycosidic bond involves the anomeric carbons of both glucose (alpha-1) and fructose (beta-2), leaving no free anomeric hydroxyl group.

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

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Basque PAU Biology Practice Questions - Basque Country PAU Biology Examination - UPV EHU (2o Bachillerato 2026) Exam

This practice set contains 100 questions from the matching question bank and focuses on cell, eukaryotic, acid, cells, and structural. 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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Basque PAU Biology Practice Questions - Basque Country PAU Biology Examination - UPV EHU (2o Bachillerato 2026) Exam

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