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100+ Free La Rioja PAU Biology Practice Questions
La Rioja PAU Biology (Biología 2º Bachillerato) practice questions are available now; exam metadata is being verified.
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2026 Statistics
Key Facts: La Rioja PAU Biology Exam
90 min
Exam Time Limit
Universidad de La Rioja
0–10
Grading Scale
Gobierno de La Rioja
4.0
Min. Access Phase Score
Universidad de La Rioja (UR)
EUR 55.43
Base Registration Fee
Gobierno de La Rioja
5 Blocks
Curriculum Content Areas
2º Bachillerato Biology Syllabus
The La Rioja PAU Biology exam (Biología) is administered by Universidad de La Rioja (UR) and Gobierno de La Rioja for students completing 2nd Bachillerato. The exam lasts 90 minutes and is graded on a 0–10 scale (minimum 4.0 required in the Access Phase). Note that local questions on this platform are an English-language MCQ study adaptation created to help students master the underlying 2nd Bachillerato curriculum.
Sample La Rioja PAU Biology Practice Questions
Try these sample questions to test your La Rioja 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 property of liquid water enables it to resist rapid temperature fluctuations in biological organisms and aquatic ecosystems?
A.High specific heat capacity
B.Low latent heat of vaporization
C.High electrical conductivity
D.Maximum density at 0 °C
Explanation: Water possesses a high specific heat capacity (4.184 J/g·°C) because extensive hydrogen bonding absorbs significant thermal energy before individual molecular kinetic energy increases, buffering cellular and environmental temperatures.
2What osmotic phenomenon occurs when a plant cell is placed in a hypertonic solution, causing its protoplast to shrink away from the rigid cell wall?
A.Plasmolysis
B.Crenation
C.Hemolysis
D.Turgor
Explanation: Plasmolysis is the shrinking of a plant cell's cytoplasm away from the cell wall when water exits the vacuole via osmosis into a hypertonic surrounding medium.
3Which carbohydrate is a ketohexose that forms a five-membered furanose ring in its dominant cyclic form and combines with glucose to form sucrose?
A.D-Fructose
B.D-Glucose
C.D-Galactose
D.D-Ribose
Explanation: D-Fructose is a ketohexose monosaccharide containing a ketone functional group at C-2; in solution, it cyclizes primarily into a five-membered furanose ring and bonds with D-glucose via an alpha-1,beta-2-glycosidic linkage to form sucrose.
4Which chemical bond connects two amino acids together during ribosome-catalyzed protein synthesis by releasing a molecule of water?
A.Peptide bond
B.Phosphodiester bond
C.Glycosidic bond
D.Ester bond
Explanation: A peptide bond is a covalent amide linkage formed by a condensation reaction between the alpha-carboxyl group of one amino acid and the alpha-amino group of another, releasing water.
5Which secondary protein structural element is characterized by a right-handed coiled conformation stabilized by intra-chain hydrogen bonds between every N-H group and C=O group four residues prior?
A.Alpha-helix
B.Beta-pleated sheet
C.Beta-turn
D.Triple helix
Explanation: The alpha-helix is a common polypeptide secondary structure coiled in a right-handed spiral where hydrogen bonds form between the carbonyl oxygen of residue i and the amide hydrogen of residue i+4.
6Which structural polysaccharide composed of beta-1,4-linked N-acetylglucosamine monomers forms the rigid exoskeleton of arthropods and cell walls of fungi?
A.Chitin
B.Cellulose
C.Glycogen
D.Amylose
Explanation: Chitin is an unbranched polymer of N-acetylglucosamine residues joined by beta-1,4-glycosidic bonds, providing structural support in fungal cell walls and arthropod exoskeletons.
7According to Chargaff's rules for double-stranded B-DNA, if a sample contains 32% Adenine, what is the expected percentage of Cytosine?
A.18%
B.32%
C.36%
D.64%
Explanation: Cytosine accounts for 18% because in double-stranded DNA, %A = %T (32% + 32% = 64%), leaving 36% for G + C; since %G = %C, Cytosine equals 36% / 2 = 18%.
8Which enzyme class catalyzes the transfer of a phosphate group from ATP to a specific substrate molecule?
A.Kinase
B.Phosphatase
C.Isomerase
D.Dehydrogenase
Explanation: Kinases (a subclass of transferases) transfer a high-energy phosphate group from a donor molecule like ATP onto a target substrate, such as a sugar or protein.
9Which lipid category is non-saponifiable because it lacks ester linkages and fatty acid chains, comprising compounds derived from five-carbon isoprene units?
A.Terpenes
B.Triacylglycerols
C.Glycerophospholipids
D.Sphingomyelins
Explanation: Terpenes (isoprenoids) are non-saponifiable lipids constructed from repeated 5-carbon isoprene (2-methyl-1,3-butadiene) subunits and do not contain fatty acid ester bonds.
10What effect does a competitive enzyme inhibitor have on the kinetic parameters Vmax (maximum velocity) and Km (Michaelis constant)?
A.Vmax remains unchanged; Km increases
B.Vmax decreases; Km remains unchanged
C.Vmax decreases; Km decreases
D.Vmax increases; Km increases
Explanation: A competitive inhibitor binds reversibly to the active site, competing with substrate; at high substrate concentrations, substrate outcompetes the inhibitor so Vmax is unchanged, but a higher substrate concentration is required to reach 1/2 Vmax, increasing Km.
About the La Rioja PAU Biology Practice Questions
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