Valencian Community PAU Biology Practice Questions - Valencian Community PAU Biology (Biologia 2o Bachillerato) Exam - Valencian Community PAU Biology Practice Questions - Valencian Community PAU Biology (Biologia 2o Bachillerato) Exam

Question 1

Which physicochemical property of water is primarily responsible for maintaining thermal homeostasis in living organisms during high environmental temperature spikes?

High specific heat capacity and high latent heat of vaporization Low surface tension and high dielectric constant Maximum density at 0 °C and low viscosity High electrical conductivity and non-polar solvent capability

Correct Answer:

High specific heat capacity and high latent heat of vaporization

Question 2

A red blood cell is placed in an aqueous solution of 0.3 M NaCl. Assuming normal intracellular osmolarity is equivalent to 0.15 M NaCl (~0.3 Osm/L), what physiological phenomenon will occur?

Water exits the cell by osmosis, causing crenation. Water enters the cell by osmosis, leading to hemolysis. Na+ ions rapidly diffuse into the cell, resulting in turgor. No net movement of water occurs because the solution is isotonic.

Correct Answer:

Water exits the cell by osmosis, causing crenation.

Question 3

Which of the following monosaccharides is an aldohexose that forms a chair conformation $\beta$-D-glucopyranose in aqueous solution?

D-Glucose D-Fructose D-Ribose Glyceraldehyde

Correct Answer:

D-Glucose

Question 4

Which disaccharide consists of two D-glucose units joined by an $\alpha(1 \rightarrow 4)$ glycosidic bond and exhibits reducing properties?

Maltose Sucrose Lactose Cellobiose

Correct Answer:

Maltose

Question 5

Structural polysaccharides like cellulose differ fundamentally from energy-storage polysaccharides like starch and glycogen because cellulose contains:

$$\beta(1 \rightarrow 4)$ glycosidic bonds forming unbranched straight chains stabilized by interchain hydrogen bonds. $$\alpha(1 \rightarrow 4)$ glycosidic bonds with frequent $\alpha(1 \rightarrow 6)$ branch points every 8–12 residues. Alternating N-acetylglucosamine and N-acetylmuramic acid units cross-linked by peptide bridges. Sulfated glycosaminoglycan disaccharide repeating units linked to core proteins.

Correct Answer:

$$\beta(1 \rightarrow 4)$ glycosidic bonds forming unbranched straight chains stabilized by interchain hydrogen bonds.

Question 1

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Prepare with the Valencian Community PAU Biology Practice Questions - Valencian Community PAU Biology (Biologia 2o Bachillerato) Exam practice quiz. This question bank includes 100 questions covering cell, text, structural, molecule, and membrane. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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Valencian Community PAU Biology Practice Questions - Valencian Community PAU Biology (Biologia 2o Bachillerato) Exam

This practice set contains 100 questions from the matching question bank and focuses on cell, text, structural, molecule, and membrane. 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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Valencian Community PAU Biology Practice Questions - Valencian Community PAU Biology (Biologia 2o Bachillerato) Exam

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