Cantabria PAU Biology Practice Questions - Cantabria PAU Biology Examination - UNICAN (Biología 2o Bachillerato 2026) Exam - Cantabria PAU Biology Practice Questions - Cantabria PAU Biology Examination - UNICAN (Biología 2o Bachillerato 2026) Exam

Question 1

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

High heat of vaporization due to intermolecular hydrogen bonds. Low boiling point caused by nonpolar covalent bonds. Higher density in the solid state than in the liquid state. Low surface tension that favors hydrophobic cohesion.

Correct Answer:

High heat of vaporization due to intermolecular hydrogen bonds.

Question 2

What happens to a human erythrocyte placed in a saline solution that is hypertonic relative to its cytoplasm?

It takes up water by osmosis until it undergoes lysis or hemolysis. It loses water by osmosis to the external medium and undergoes crenation (shriveling). It takes up Na+ ions by simple diffusion, increasing cell volume. It remains unchanged because the membrane is completely impermeable to water.

Correct Answer:

It loses water by osmosis to the external medium and undergoes crenation (shriveling).

Question 3

What is the main function of the bicarbonate buffer system (HCO3− / H2CO3) in human blood plasma?

To catalyze hydrolysis of plasma proteins during physiological exercise. To raise osmotic pressure by irreversibly precipitating calcium phosphate salts. To keep plasma pH within physiological limits (about 7.35–7.45). To transport dietary triglycerides directly to adipose tissue.

Correct Answer:

To keep plasma pH within physiological limits (about 7.35–7.45).

Question 4

How do the α and β anomers of D-glucopyranose differ structurally in aqueous solution?

In the total number of carbon atoms in the hydrocarbon chain. In having a ketone group instead of an aldehyde group in the open-chain form. In the ability to form peptide bonds with aromatic amino acids. In the spatial orientation of the hydroxyl (–OH) attached to the anomeric carbon (C1).

Correct Answer:

In the spatial orientation of the hydroxyl (–OH) attached to the anomeric carbon (C1).

Question 5

Why does sucrose (α-D-glucopyranosyl-(1→2)-β-D-fructofuranoside) lack reducing power toward Fehling’s reagent?

Because both anomeric carbons (C1 of glucose and C2 of fructose) are involved in the glycosidic bond. Because it contains only galactose units linked by β(1→4) bonds. Because its structure completely lacks hydroxyl groups on the furanose rings. Because it denatures rapidly at room temperature, releasing carbon monoxide.

Correct Answer:

Because both anomeric carbons (C1 of glucose and C2 of fructose) are involved in the glycosidic bond.

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Prepare with the Cantabria PAU Biology Practice Questions - Cantabria PAU Biology Examination - UNICAN (Biología 2o Bachillerato 2026) Exam practice quiz. This question bank includes 100 questions covering such, role, cells, fundamental, and transport. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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Cantabria PAU Biology Practice Questions - Cantabria PAU Biology Examination - UNICAN (Biología 2o Bachillerato 2026) Exam

This practice set contains 100 questions from the matching question bank and focuses on such, role, cells, fundamental, and transport. 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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Cantabria PAU Biology Practice Questions - Cantabria PAU Biology Examination - UNICAN (Biología 2o Bachillerato 2026) Exam

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