Madrid PAU Biology Practice Questions - Madrid PAU Biology Examination - UCM & Public Universities (Biología 2o Bachillerato 2026) Exam - Madrid PAU Biology Practice Questions - Madrid PAU Biology Examination - UCM & Public Universities (Biología 2o Bachillerato 2026) Exam

Question 1

Which physicochemical property of water allows aquatic organisms to survive under ice-covered lakes during cold winter seasons?

Maximum density of water occurs in the liquid state at 4 °C, causing ice to float and insulate the underlying water High specific heat capacity causes water to freeze from the bottom of the lake upward Low surface tension prevents ice crystals from forming on the surface of the lake High latent heat of vaporization forces liquid water to contract upon freezing

Correct Answer:

Maximum density of water occurs in the liquid state at 4 °C, causing ice to float and insulate the underlying water

Question 2

When red blood cells (erythrocytes) are placed in a hypertonic NaCl solution, what cellular phenomenon occurs?

Water leaves the cells by osmosis, causing them to shrink and undergo crenation Water enters the cells by osmosis, causing them to swell and undergo osmotic lysis (hemolysis) Solutes actively pump out of the cells until turgor pressure equals osmotic pressure The cell wall exerts wall pressure to prevent any net movement of water

Correct Answer:

Water leaves the cells by osmosis, causing them to shrink and undergo crenation

Question 3

Calculate the osmotic pressure (π) at 27 °C (300 K) for a 0.2 M aqueous solution of sodium chloride (NaCl), assuming complete dissociation (van 't Hoff factor i = 2) and R = 0.0821 L·atm/(mol·K).

9.85 atm 4.93 atm 2.46 atm 19.70 atm

Correct Answer:

9.85 atm

Question 4

D-Glucose and D-Galactose are structural isomers that differ in configuration specifically around carbon-4. What term precisely describes their structural relationship?

C-4 Epimers Enantiomers Anomers Ketose-aldose tautomers

Correct Answer:

C-4 Epimers

Question 5

Which of the following disaccharides is a non-reducing sugar because both of its anomeric carbons are involved in the glycosidic bond?

Sucrose (α-D-glucopyranosyl-(1→2)-β-D-fructofuranoside) Maltose (α-D-glucopyranosyl-(1→4)-D-glucopyranose) Lactose (β-D-galactopyranosyl-(1→4)-D-glucopyranose) Cellobiose (β-D-glucopyranosyl-(1→4)-D-glucopyranose)

Correct Answer:

Sucrose (α-D-glucopyranosyl-(1→2)-β-D-fructofuranoside)

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

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Madrid PAU Biology Practice Questions - Madrid PAU Biology Examination - UCM & Public Universities (Biología 2o Bachillerato 2026) Exam

This practice set contains 100 questions from the matching question bank and focuses on cell, structural, cycle, cells, and acid. 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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Madrid PAU Biology Practice Questions - Madrid PAU Biology Examination - UCM & Public Universities (Biología 2o Bachillerato 2026) Exam

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