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Sample Moldova Bacalaureat Biology Practice Questions

Try these sample questions to review concepts for the Moldova Bacalaureat Biology exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 60+ question experience with AI tutoring.

1Which pentose sugar is a structural constituent of ribonucleic acid (RNA) and differs from 2-deoxyribose by having a hydroxyl group (-OH) attached to its 2' carbon?
A.Glucose
B.Fructose
C.Ribose
D.Galactose
Explanation: Ribose is a five-carbon aldopentose sugar (C5H10O5) containing a hydroxyl group at the 2' carbon. In contrast, 2-deoxyribose (found in DNA) lacks this oxygen atom at the 2' position, carrying only a hydrogen atom (-H).
2What type of covalent chemical bond links adjacent amino acid monomers together during translation on a ribosome?
A.Peptide bond
B.Phosphodiester bond
C.Glycosidic bond
D.Disulfide bond
Explanation: Peptide bonds are covalent amide linkages formed via condensation (dehydration synthesis) reactions between the alpha-carboxyl group (-COOH) of one amino acid and the alpha-amino group (-NH2) of the incoming amino acid, catalyzed by the peptidyl transferase activity of the large ribosomal subunit.
3Which nuclear sub-compartment is the primary site of ribosomal RNA (rRNA) transcription and the assembly of ribosomal subunits in eukaryotic cells?
A.Nuclear envelope
B.Nucleolus
C.Nuclear pore complex
D.Centrosome
Explanation: The nucleolus is a dense, non-membrane-bound subnuclear structure organized around nucleolar organizer regions (NORs). It is responsible for transcribing precursor rRNA, processing it, and assembling it with ribosomal proteins imported from the cytoplasm to produce the 40S and 60S ribosomal subunits.
4Which eukaryotic organelle contains acidic hydrolytic enzymes capable of digesting phagocytosed pathogens, damaged organelles, and cellular debris?
A.Golgi apparatus
B.Peroxisome
C.Mitochondrion
D.Lysosome
Explanation: Lysosomes are single-membrane organelles containing over 50 different acid hydrolases (including proteases, nucleases, lipases, and sulfatases) optimal at pH ~4.5–5.0, maintained by vacuolar H+-ATPases. They mediate heterophagy, autophagy, and autolysis.
5Which of the following characteristics distinguishes prokaryotic cells (such as bacteria) from eukaryotic cells?
A.Absence of membrane-bound organelles and a true nuclear envelope
B.Presence of linear chromosomes enclosed within a nuclear matrix
C.Presence of 80S cytosolic ribosomes and mitochondria
D.Presence of endomembrane compartments including the Golgi apparatus
Explanation: Prokaryotic cells lack membrane-bound internal organelles (including a true nucleus, mitochondria, chloroplasts, endoplasmic reticulum, and Golgi apparatus). Their genetic material consists of a single circular double-stranded DNA molecule located in the nucleoid region, and they possess smaller 70S ribosomes.
6What is the biological definition of osmosis across a living cell membrane?
A.Movement of solute molecules against an electrochemical gradient using ATP hydrolysis
B.Transport of large macromolecules via endocytic vesicle engulfment
C.Net diffusion of water molecules across a selectively permeable membrane toward a region of higher solute concentration
D.Carrier-mediated facilitated diffusion of ions down their concentration gradient
Explanation: Osmosis is the spontaneous net movement of solvent (water) molecules through a selectively permeable membrane from a solution of lower solute concentration (higher water potential) to a solution of higher solute concentration (lower water potential), equalizing chemical potentials.
7During which phase of mitosis do sister chromatids cleave their centromeric cohesin links and move toward opposite poles of the mitotic spindle?
A.Prophase
B.Anaphase
C.Telophase
D.Metaphase
Explanation: During mitotic anaphase, the separase enzyme cleaves cohesin proteins holding sister chromatids together. Kinetochore microtubules depolymerize at their plus and minus ends, pulling individual daughter chromosomes to opposite centrosomal poles (Anaphase A), while polar microtubules slide to elongate the cell (Anaphase B).
8In the glycolytic pathway taking place in the eukaryotic cytosol, what is the net yield of ATP and reduced nicotinamide adenine dinucleotide (NADH) per single molecule of glucose oxidized to two pyruvate molecules?
A.4 net ATP and 4 NADH
B.2 net ATP and 0 NADH
C.1 net ATP and 2 NADH
D.2 net ATP and 2 NADH
Explanation: Glycolysis consists of an energy-investment phase (consuming 2 ATP to phosphorylate glucose to fructose-1,6-bisphosphate) and an energy-payoff phase (generating 4 ATP via substrate-level phosphorylation and reducing 2 NAD+ to 2 NADH via glyceraldehyde-3-phosphate dehydrogenase). Net yield = 4 - 2 = 2 ATP, along with 2 NADH and 2 pyruvate.
9According to the Singer-Nicolson fluid mosaic model, what is the primary structural role of cholesterol within eukaryotic animal plasma membranes?
A.It acts as a bidirectional fluidity buffer, restraining phospholipid movement at elevated temperatures and preventing tight acyl packing at lower temperatures
B.It provides direct enzymatic hydrolysis of ATP to drive primary active transport across the phospholipid bilayer
C.It forms the hydrophilic pore lining that facilitates continuous passive diffusion of water-soluble ions
D.It binds to extracellular peptide hormones to initiate second-messenger signal cascades
Explanation: Cholesterol intercalates between phospholipids with its steroid ring interacting with hydrophobic hydrocarbon tails and its hydroxyl group positioned near polar heads. At high temperatures, it stabilizes membrane structure by restraining fatty acid tail movement; at low temperatures, it prevents crystalline hydrocarbon packing, preserving essential membrane fluidity.
10Which of the following cellular physiological functions is predominantly carried out by the smooth endoplasmic reticulum (SER) rather than the rough endoplasmic reticulum (RER)?
A.Synthesis of secretory proteins and insertion of signal peptides
B.N-linked core glycosylation of nascent lysosomal hydrolases
C.Synthesis of lipids (including phospholipids and steroid hormones), detoxification of hydrophobic xenobiotics, and sequestering of calcium ions
D.Synthesis of ribosomal RNA and maturation of the 60S ribosomal subunit
Explanation: The smooth endoplasmic reticulum lacks surface ribosomes and is specialized for lipid and steroid hormone synthesis (e.g., in adrenal cortex and gonadal cells), detoxification of lipid-soluble drugs and toxic metabolites via cytochrome P450 enzymes in hepatocytes, and calcium sequestration and release (as the sarcoplasmic reticulum in muscle fibers).

About the Moldova Bacalaureat Biology Exam

Examenul Național de Bacalaureat — Biologie is a current Moldova national Bacalaureat assessment administered by ANCE. Published study domains include Diversity and evolution, Systems and vital processes, Genetics and organism improvement, Ecology and environmental protection. This local bank is an independent English-language MCQ study adaptation. It is not an official translation, not an official-format simulation, and does not replace practice with the official written tasks.

Exam sponsor: National Agency for Curriculum and Evaluation (ANCE), Ministry of Education and Research of the Republic of Moldova. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Official assessment: written paper with selected-response, short constructed-response, diagram/data interpretation, genetics problems, and structured biological explanations. This local bank is an independent English-language MCQ study adaptation. It is not an official translation, not an official-format simulation, and does not replace practice with the official written tasks.

Time Limit

180 minutes

Passing Score

A final Bacalaureat subject mark of at least 5.00 on the 10-point scale is required; the raw-point conversion is published with the official marking scheme.

Exam / Certification Fees

ANCE does not publish a separate per-paper fee for school-registered candidates.

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Official sources

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

Official percentage not published

Diversity and evolution

Organism classification, biodiversity, evolutionary evidence and natural selection.

Official percentage not published

Systems and vital processes

Cell structure and composition plus human organ systems, health, and life processes.

Official percentage not published

Genetics and organism improvement

DNA, cell division, Mendelian and linked inheritance, mutation, human genetics, breeding, and biotechnology.

Official percentage not published

Ecology and environmental protection

Ecosystems, trophic relations, pollution, biodiversity conservation, and environmental action.

Preparing for the Moldova Bacalaureat Biology Exam

What You Need to Know

  • Passing score: A final Bacalaureat subject mark of at least 5.00 on the 10-point scale is required; the raw-point conversion is published with the official marking scheme.
  • Assessment: Official assessment: written paper with selected-response, short constructed-response, diagram/data interpretation, genetics problems, and structured biological explanations. This local bank is an independent English-language MCQ study adaptation. It is not an official translation, not an official-format simulation, and does not replace practice with the official written tasks.
  • Time limit: 180 minutes
  • Exam / certification fees: ANCE does not publish a separate per-paper fee for school-registered candidates. Official sources

Using Our Practice Resources

  • Work through all 60 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

Moldova Bacalaureat Biology: Suggested Study Strategy

1Use the official ANCE program as the checklist for topics and competencies.
2After MCQ review, practise the official written task types under the published time conditions.
3Check answers against official terminology, source texts, diagrams, or calculations rather than memorizing option positions.

Frequently Asked Questions

Is this the official exam format?

No. This local bank is an independent English-language MCQ study adaptation. It is not an official translation, not an official-format simulation, and does not replace practice with the official written tasks.

What language is the official assessment offered in?

Confirmed 2026 paper language code(s): ro, ru, en, fr.

How many questions are on the official paper?

The official program does not promise a fixed future item count; consult the current ANCE paper and marking scheme.