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Canary Islands PAU Biology Examination — ULPGC & ULL (Biología 2º Bachillerato 2026) practice questions are available now; exam metadata is being verified.
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2026 Statistics
Key Facts: Canary PAU Biology Exam
90 Minutes
Exam duration
COPAU / ULPGC / ULL
EUR 76.12
Base registration fee for Access Phase
Gobierno de Canarias
0–10 Scale
Grading scale for Bachillerato and PAU exams
Spanish Ministry of Education
5 Core Blocks
Biochemistry, Cell Biology, Metabolism, Genetics, Microbiology & Immunology
LOMLOE Biology Syllabus
100 Questions
Practice bank size in OpenExamPrep
OpenExamPrep
Canary Islands PAU Biology (ULPGC & ULL 2026) is a 90-minute university entrance exam assessing 2º Bachillerato Biology across 5 core subject blocks.
Sample Canary PAU Biology Practice Questions
Try these sample questions to test your Canary PAU Biology exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.
1Which physicochemical property of water is primarily responsible for maintaining temperature stability in aquatic environments and preventing rapid thermal fluctuations in living organisms?
A.Low dielectric constant allowing nonpolar solute precipitation
B.Covalent interaction between hydrophobic hydrocarbon residues
C.High specific heat capacity resulting from extensive intermolecular hydrogen bonding
D.High density in the solid state compared to the liquid state
Explanation: Water possesses a high specific heat capacity (1 cal/g·°C or 4.184 J/g·°C) because a significant amount of thermal energy is absorbed to disrupt the extensive network of hydrogen bonds before water molecules increase their kinetic energy. This property buffers biological systems and aquatic ecosystems against sudden temperature changes.
2What happens to a red blood cell (erythrocyte) when placed in a hypertonic NaCl solution?
A.Water enters the cell by osmosis, causing it to swell and undergo osmotic lysis
B.Water leaves the cell by osmosis, causing it to shrink and become crenated
C.NaCl enters the cell via active transport until equilibrium is established
D.The cell membrane becomes impermeable and no net movement of water occurs
Explanation: In a hypertonic solution, the external solute concentration is higher than the intracellular osmolarity. Water moves out of the erythrocyte by osmosis down its water potential gradient, causing the cell to shrink and wrinkle, a process known as crenation (or plasmolysis in walled plant cells).
3Which monosaccharide is a ketohexose essential for carbohydrate metabolism and fruit sweetness?
A.D-Fructose
B.D-Galactose
C.D-Ribose
D.D-Glucose
Explanation: D-Fructose is a six-carbon monosaccharide (hexose) containing a ketone group at carbon 2, making it a ketohexose. It is abundant in fruits and honey and is phosphorylated during glycolysis by fructokinase or hexokinase.
4Which glycosidic bond joins the two monosaccharide units in sucrose (table sugar)?
A.alpha(1->4) glycosidic bond between two D-glucose molecules
B.beta(1->4) glycosidic bond between D-galactose and D-glucose
C.alpha(1->6) glycosidic bond at glycogen branch points
D.alpha(1)->beta(2) glycosidic bond joining the anomeric carbons of D-glucose and D-fructose
Explanation: Sucrose is a non-reducing disaccharide composed of alpha-D-glucopyranose and beta-D-fructofuranose linked by an alpha(1)->beta(2) glycosidic bond involving the anomeric carbons of both monosaccharides.
5Which polysaccharide serves as the primary energy storage molecule in animal cells?
A.Glycogen
B.Cellulose
C.Starch
D.Chitin
Explanation: Glycogen is a highly branched polymer of D-glucose linked by alpha(1->4) linear chains and alpha(1->6) branch points, stored mainly in the liver and skeletal muscle of animals for rapid glucose mobilization.
6How do double bonds in cis-unsaturated fatty acids affect lipid physical properties at room temperature?
A.They transform fatty acids into amphipathic steroids
B.They promote covalent cross-linking between adjacent acyl chains
C.They increase packing density and raise the melting point, making the lipid solid
D.They introduce kinks in the hydrocarbon chain, reducing intermolecular packing and lowering the melting point
Explanation: Cis double bonds create rigid bends (kinks) in the hydrocarbon chain of unsaturated fatty acids. These kinks prevent tight parallel packing of acyl chains, weakening Van der Waals interactions and resulting in lower melting points (liquid oils at room temperature).
7Why are glycerophospholipids described as amphipathic biomolecules?
A.They contain both hydrophilic polar head groups and hydrophobic nonpolar fatty acid tails
B.They dissolve completely in both water and organic solvents without forming aggregates
C.They consist entirely of nonpolar hydrocarbon chains linked by peptide bonds
D.They are composed of four condensed hydrocarbon rings with a terminal hydroxyl group
Explanation: Glycerophospholipids possess a polar, hydrophilic head (phosphate group attached to an alcohol like choline or ethanolamine) and two nonpolar, hydrophobic hydrocarbon tails (fatty acid chains). This dual nature drives spontaneous lipid bilayer self-assembly in aqueous environments.
8Which chemical bond connects fatty acid residues to glycerol in a triacylglycerol molecule?
A.Peptide bond
B.Phosphodiester bond
C.Glycosidic bond
D.Ester bond
Explanation: Triacylglycerols are formed through esterification reactions between the three hydroxyl groups (-OH) of glycerol and the carboxyl groups (-COOH) of three fatty acids, yielding three ester bonds and releasing three water molecules.
9What is the net electrical charge of an amino acid at its specific isoelectric point (pI)?
A.Negative (-1) due to complete dissociation of the amino group
B.Variable depending on atmospheric pressure
C.Positive (+2) due to double protonation of the alpha-carboxyl group
D.Zero (zwitterionic state with balanced positive and negative charges)
Explanation: At the isoelectric point (pI), an amino acid exists as a zwitterion where the amino group is protonated ($-NH_3^+$) and the carboxyl group is deprotonated ($-COO^-$). The positive and negative charges balance out, resulting in a net electrical charge of zero.
10Which chemical interactions stabilize the alpha-helix and beta-pleated sheet structures of proteins?
A.Disulfide bridges between cysteine side chains
B.Hydrogen bonds between carbonyl oxygens and amide hydrogens of the peptide backbone
C.Hydrophobic interactions between aromatic side chains in the core
D.Ionic bonds between lysine and glutamate residue side chains
Explanation: Secondary protein structures (alpha-helices and beta-pleated sheets) are stabilized by hydrogen bonding between the carbonyl oxygen ($C=O$) of one peptide bond and the amino hydrogen ($N-H$) of another along the polypeptide backbone.
About the Canary PAU Biology Practice Questions
Verified exam format metadata for Canary Islands PAU Biology Examination — ULPGC & ULL (Biología 2º Bachillerato 2026) is pending. The practice questions above remain available while official exam length, timing, passing score, fee, and administrator details are reviewed.