100+ Free Baccalauréat Série D Cameroun Practice Questions

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2026 Statistics

Key Facts: Baccalauréat Série D Cameroun Exam

Coef 6

SVTEEHB Subject Coefficient (Highest weight in Série D)

Office du Baccalauréat du Cameroun (OBC)

>= 10.00 / 20

Minimum Passing General Average (Moyenne d'admission)

Règlement Général des Examens OBC

13,000 FCFA

Official Registration Fee for Regular Candidates

MINESEC / OBC Fee Schedule

100 MCQs

Practice Questions in this Comprehensive Bank

OpenExamPrep Cameroon Curriculum Adaptation

Free English-language MCQ study adaptation for Cameroon's French-language Baccalauréat Série D (Mathématiques et Sciences de la Vie et de la Terre), covering SVTEEHB, Mathematics, Physics, Chemistry, and Philosophy/French Humanities. It is an independent preparation resource designed to test syllabus mastery.

Sample Baccalauréat Série D Cameroun Practice Questions

Try these sample questions to test your Baccalauréat Série D Cameroun exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1In cellular respiration, what is the primary mechanism by which the ATP synthase complex in the inner mitochondrial membrane synthesizes ATP from ADP and inorganic phosphate?

A.Chemiosmotic coupling driven by the flow of protons (H+) down their electrochemical gradient from the intermembrane space into the matrix

B.Direct substrate-level phosphorylation driven by high-energy phosphate transfer from succinyl-CoA in the mitochondrial matrix

C.Active transport of sodium ions (Na+) across the outer mitochondrial membrane coupled to ATP hydrolysis

D.Direct electron transfer from reduced coenzymes (NADH and FADH2) to the catalytic F1 subunit of ATP synthase

Explanation: According to Peter Mitchell's chemiosmotic theory, the electron transport chain pumps protons from the mitochondrial matrix into the intermembrane space, establishing an electrochemical proton gradient. As protons flow back down this gradient into the matrix through the F0 channel of ATP synthase, the proton-motive force drives the rotational catalytic synthesis of ATP by the F1 subunit.

2During semi-conservative DNA replication in eukaryotic cells, why is the lagging strand synthesized discontinuously as Okazaki fragments?

A.DNA topoisomerase can only unwind DNA in the 3' to 5' direction along the leading strand template

B.DNA polymerases can only polymerize new nucleotides in the 5' to 3' direction, requiring backward synthesis away from the advancing replication fork

C.RNA primers can only bind to the leading strand, preventing continuous elongation on the lagging template

D.Helicase cleaves the lagging strand into short single-stranded fragments prior to nucleotide insertion

Explanation: Because DNA polymerases add incoming deoxynucleotides exclusively to the free 3'-OH group of an existing polynucleotide chain, synthesis proceeds strictly in the 5' to 3' direction. On the lagging strand template (oriented 5' to 3' toward the replication fork), replication must occur discontinuously away from the fork in short Okazaki fragments that are subsequently joined by DNA ligase.

3How does a competitive enzyme inhibitor affect the kinetic parameters Michaelis constant (Km) and maximum reaction velocity (Vmax) of an enzymatic reaction?

A.It decreases Vmax while leaving Km unchanged

B.It decreases both Km and Vmax in equal proportions

C.It increases the apparent Km while leaving Vmax unchanged

D.It increases both Km and Vmax simultaneously

Explanation: A competitive inhibitor structurally resembles the natural substrate and reversibly binds to the enzyme's active site. Because high substrate concentrations can completely displace the inhibitor, the maximum catalytic rate (Vmax) remains unchanged, but a higher substrate concentration is required to reach half-maximal velocity, resulting in an increased apparent Km.

4According to Francis Crick's Wobble Hypothesis in molecular genetics, what mechanism explains how a single transfer RNA (tRNA) anticodon can recognize multiple synonymous codons on mRNA?

A.The 5' base of the mRNA codon can form non-standard hydrogen bonds with the 3' base of the tRNA anticodon

B.DNA ligase modifies the central nucleotide of the anticodon loop during post-transcriptional splicing

C.Aminoacyl-tRNA synthetase attaches multiple different amino acids to the same tRNA molecule based on ribosomal conformation

D.Spatial flexibility at the 5' position of the tRNA anticodon allows unconventional non-Watson-Crick base pairing with the 3' base of the mRNA codon

Explanation: Crick's wobble hypothesis establishes that base pairing between the first two codon bases (5' to 3' on mRNA) and the last two anticodon bases (3' to 5' on tRNA) is strictly standard Watson-Crick, while conformational flexibility at the 5' position of the anticodon allows 'wobble' pairing (such as inosine pairing with U, C, or A) with the 3' nucleotide of the codon. This accounts for the degeneracy of the genetic code without requiring 61 distinct tRNA species.

5Which key stromal enzyme catalyzes the initial carbon dioxide fixation step in the Calvin-Benson cycle of C3 photosynthetic plants?

A.Ribulose-1,5-bisphosphate carboxylase-oxygenase (RuBisCO)

B.Phosphoenolpyruvate carboxylase (PEP carboxylase)

C.Glyceraldehyde-3-phosphate dehydrogenase (GAPDH)

D.ATP sulfurylase

Explanation: RuBisCO catalyzes the carboxylation of the 5-carbon acceptor molecule ribulose-1,5-bisphosphate (RuBP) with carbon dioxide, generating an unstable 6-carbon intermediate that immediately splits into two molecules of 3-phosphoglycerate (3-PGA) in the stroma of chloroplasts.

6In a dihybrid testcross involving two autosomal genes A and B, a heterozygous female (AB/ab) is crossed with a homozygous recessive male (ab/ab). The testcross yields 420 AB/ab, 410 ab/ab, 85 Ab/ab, and 85 aB/ab offspring. What is the recombination frequency and map distance between the two loci?

A.8.5% recombination frequency, corresponding to 8.5 cM

B.17.0% recombination frequency, corresponding to 17.0 cM

C.34.0% recombination frequency, corresponding to 34.0 cM

D.50.0% recombination frequency, indicating independent assortment on separate chromosomes

Explanation: Recombination frequency (RF) is calculated as: RF = (Number of recombinant offspring / Total number of offspring) * 100. Here, recombinants = 85 + 85 = 170, and total offspring = 420 + 410 + 85 + 85 = 1000. RF = (170 / 1000) * 100 = 17.0%. By definition, 1% recombination corresponds to 1 centimorgan (cM) or map unit, so the distance is 17.0 cM.

7In humans, hemophilia A is an X-linked recessive bleeding disorder. A woman whose father had hemophilia A marries a phenotypically normal man. What is the probability that their first son will be affected by hemophilia A?

A.0% (0.00)

B.25% (0.25)

C.50% (0.50)

D.100% (1.00)

Explanation: Because the woman's father had hemophilia (X^h Y), she must have inherited his X^h chromosome, making her an obligate carrier with genotype X^H X^h. Her husband has normal clotting with genotype X^H Y. When considering male offspring specifically, the son receives a Y chromosome from his father and has a 50% (1/2) chance of inheriting the maternal X^h allele, giving a 50% probability of being affected.

8During gametogenesis, how does chromosomal non-disjunction occurring during Meiosis I differ in its gametic outcome from non-disjunction occurring during Meiosis II?

A.Meiosis I non-disjunction produces 100% normal haploid gametes (n), whereas Meiosis II non-disjunction produces 100% triploid gametes (3n)

B.Meiosis I non-disjunction yields two normal gametes (n) and two nullisomic gametes (n-1), whereas Meiosis II non-disjunction yields four disomic gametes (n+1)

C.Meiosis I non-disjunction results in 50% aneuploid gametes (n+1 and n-1), whereas Meiosis II non-disjunction results in 100% aneuploid gametes

D.Meiosis I non-disjunction results in 100% aneuploid gametes (two n+1 and two n-1), whereas Meiosis II non-disjunction results in 50% aneuploid gametes (one n+1, one n-1) and 50% normal gametes (two n)

Explanation: In Meiosis I non-disjunction, homologous chromosomes fail to separate, causing both homologues to migrate to one pole. All four resulting gametes are abnormal: two carry an extra chromosome (n+1) and two lack that chromosome (n-1). In Meiosis II non-disjunction, sister chromatids fail to separate in only one secondary meiocyte, producing one n+1 gamete, one n-1 gamete, and two normal haploid gametes (n).

9Which physiological feature fundamentally distinguishes a secondary immune response from a primary immune response upon re-exposure to a specific antigen?

A.A significantly shorter latency phase, a rapid exponential surge in high-affinity IgG antibody titers, and greater persistence due to memory B and T cells

B.A prolonged lag phase of several weeks followed exclusively by low-affinity IgM secretion by non-differentiated naive B cells

C.Immediate suppression of cytotoxic T lymphocytes combined with non-specific phagocytosis by neutrophils without clonal expansion

D.Complete absence of immunoglobulin isotype switching, resulting in sole production of IgE antibodies

Explanation: Due to the presence of pre-existing, antigen-specific memory B and T cells formed during the primary challenge, the secondary immune response exhibits a much shorter lag time (hours to days vs. 1-2 weeks), produces vastly higher antibody titers predominantly of the high-affinity IgG isotype via affinity maturation, and maintains protective levels for years.

10Regarding antigen presentation in cellular immunology, which statement accurately differentiates Class I and Class II Major Histocompatibility Complex (MHC / CMH) molecules?

A.MHC Class I molecules are expressed exclusively on professional antigen-presenting cells to activate CD4+ T helper cells

B.MHC Class I molecules present endogenous peptide antigens to CD8+ cytotoxic T cells on all nucleated cells, whereas MHC Class II molecules present exogenous peptide antigens to CD4+ helper T cells on professional APCs

C.MHC Class II molecules present lipid antigens directly to B cell receptors without requiring T cell receptor engagement

D.MHC Class II molecules are expressed on red blood cells and platelets to mediate antibody-dependent cellular cytotoxicity

Explanation: MHC Class I molecules are expressed on virtually all nucleated cells and present endogenous peptides (e.g., viral or tumoral proteins degraded by the proteasome) to CD8+ cytotoxic T lymphocytes. In contrast, MHC Class II molecules are expressed selectively on professional antigen-presenting cells (dendritic cells, macrophages, B lymphocytes) and present exogenous antigens processed via the endosomal-lysosomal pathway to CD4+ helper T lymphocytes.

About the Baccalauréat Série D Cameroun Exam

The Baccalauréat de l'Enseignement Secondaire Général Série D (Mathématiques et Sciences de la Vie et de la Terre) is Cameroon's national high-school leaving diploma certifying advanced mastery of life and earth sciences, mathematics, physics, chemistry, and humanities. Administered by the Office du Baccalauréat du Cameroun (OBC) under the authority of the Ministry of Secondary Education (MINESEC), this diploma serves as both the completion certificate of secondary education and the primary qualification for matriculation into Cameroonian and international universities, medical faculties (Faculté de Médecine et des Sciences Biomédicales - FMSB), agronomy schools (Faculté d'Agronomie et des Sciences Agricoles - FASA), and competitive engineering grand écoles. Format and language note: the official examination is written in French and assessed by essays, dissertations, structured problems and practical or oral papers, not by multiple-choice questions. This site's practice bank is a 100-question English-language MCQ study adaptation of the official syllabus — a study aid for the underlying knowledge and reasoning. It is not an official translation, not an official-format simulation, and not a substitute for practising French-language written composition or the practical and oral components.

Assessment

Multi-subject national written examination defined by Arrêté n° 94/22/MINESEC of 17 March 2022. 1er groupe: Mathématiques (4h, coef 4), SVTEEHB Théorique (4h, coef 4), SVTEEHB Pratique (2h, coef 2), Chimie Théorique (3h, coef 1,5), Chimie Pratique (1h, coef 0,5) and Informatique (2h, coef 2). 2ème groupe: Littérature ou Culture Générale (3h, coef 2), Langue Française (2h, coef 1), Anglais (2h, coef 3), Physique (3h, coef 2), Philosophie (2h, coef 2), Géographie (2h, coef 1), Éducation à la Citoyenneté et à la Morale (2h, coef 2) and EPS théorique (2h, coef 2), plus optional épreuves facultatives (1h, coef 1). Série D includes compulsory SVTEEHB Pratique and Chimie Pratique papers; it has no Histoire paper.

Time Limit

Approximately 34 hours of scheduled papers across the written phase of 25–26 and 28–30 May 2026; individual papers range from 1 to 4 hours

Passing Score

Moyenne générale of at least 10.00/20 across all coefficient-weighted papers

Exam Fee

13,000 FCFA (Office du Baccalauréat du Cameroun (OBC))

Baccalauréat Série D Cameroun Exam Content Outline

35%

Sciences de la Vie et de la Terre, Éducation à l'Environnement, Hygiène et Biotechnologie (SVTEEHB)

Cellular biology, enzymes, molecular genetics, Mendelian inheritance, human reproduction, neurophysiology, endocrine regulation, immunology, geology of Cameroon and Africa, plate tectonics, pedology, and environmental biotechnology (Coefficient 6 on official exam)

25%

Mathématiques

Analysis (limits, continuity, derivatives, logarithms, exponentials, integrals, differential equations), numerical sequences, complex numbers, combinatorics, probabilities, and two-variable statistics (Coefficient 4 on official exam)

25%

Sciences Physiques (Physique et Chimie)

Mechanics (Newton's laws, projectiles, fields), wave optics, nuclear physics and radioactivity, organic chemistry, acid-base aqueous equilibria, chemical kinetics, and electrochemistry (Physique Coef 3, Chimie Coef 2 on official exam)

15%

Français, Philosophie et Sciences Humaines

Philosophy (epistemology, bioethics, nature and culture, African philosophy), French language and literature (rhetorical figures, literary analysis, Cameroonian and African authors), and History-Geography of Cameroon (Français Coef 3, Philo Coef 2 on official exam)

How to Pass the Baccalauréat Série D Cameroun Exam

What You Need to Know

Passing score: Moyenne générale of at least 10.00/20 across all coefficient-weighted papers
Assessment: Multi-subject national written examination defined by Arrêté n° 94/22/MINESEC of 17 March 2022. 1er groupe: Mathématiques (4h, coef 4), SVTEEHB Théorique (4h, coef 4), SVTEEHB Pratique (2h, coef 2), Chimie Théorique (3h, coef 1,5), Chimie Pratique (1h, coef 0,5) and Informatique (2h, coef 2). 2ème groupe: Littérature ou Culture Générale (3h, coef 2), Langue Française (2h, coef 1), Anglais (2h, coef 3), Physique (3h, coef 2), Philosophie (2h, coef 2), Géographie (2h, coef 1), Éducation à la Citoyenneté et à la Morale (2h, coef 2) and EPS théorique (2h, coef 2), plus optional épreuves facultatives (1h, coef 1). Série D includes compulsory SVTEEHB Pratique and Chimie Pratique papers; it has no Histoire paper.
Time limit: Approximately 34 hours of scheduled papers across the written phase of 25–26 and 28–30 May 2026; individual papers range from 1 to 4 hours
Exam fee: 13,000 FCFA

Keys to Passing

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Baccalauréat Série D Cameroun Study Tips from Top Performers

1Focus intensely on SVTEEHB (Coef 6) and Mathematics (Coef 4), as these two subjects alone represent a massive proportion of your total weighted points.

2Master step-by-step problem-solving in Math and Physics-Chemistry, particularly differential equations, logarithmic/exponential functions, probability trees, projectile kinematics, and acid-base buffer calculations.

3Review the regional geology of Cameroon, especially the Cameroon Volcanic Line (LVC), the Pan-African North-Equatorial mobile belt, and coastal sedimentary basins (Douala, Kribi-Campo).

4Memorize biological mechanisms thoroughly: cellular respiration, protein synthesis, synaptic transmission, hormonal regulation of glycemia and reproduction, and immune response pathways.

5Practice past national OBC exam papers (épreuves des sessions antérieures) under timed conditions to improve speed and structural precision in essay and problem formatting.

6Do not neglect literary and philosophical subjects (Français and Philosophie, combined Coef 5); strong performances in essay writing and textual analysis often make the difference for honors mentions (mentions).

Frequently Asked Questions

What is the Baccalauréat Série D in Cameroon?

The Baccalauréat Série D is Cameroon's national scientific secondary school leaving diploma specializing in Life and Earth Sciences (SVTEEHB) and Mathematics. It is organized by the Office du Baccalauréat du Cameroun (OBC) and serves as the primary gateway to biomedical, environmental, pharmaceutical, and scientific higher education.

What are the key subjects and coefficients for Série D?

The dominant subjects in Série D are SVTEEHB (Coefficient 6), Mathématiques (Coefficient 4), Physique (Coefficient 3), Français (Coefficient 3), Chimie (Coefficient 2), Philosophie (Coefficient 2), Histoire-Géographie (Coefficient 2), Anglais / Épreuve Complémentaire (Coefficient 2), and Éducation Physique (Coefficient 2).

How is the passing grade calculated in the Cameroon Baccalauréat?

Each subject grade (out of 20) is multiplied by its coefficient. The sum of weighted points is divided by the total sum of coefficients. A candidate must achieve an overall general average (moyenne générale) of at least 10.00/20 to pass. Mention thresholds are: Passable (10.00-11.99), Assez Bien (12.00-13.99), Bien (14.00-15.99), and Très Bien (>= 16.00/20).

What higher education paths are open to Série D graduates?

Graduates can apply to university faculties of science, biomedical sciences, and medicine (such as FMSB Yaoundé, FMSP Douala, and FMBS Buea/Garoua), agronomy (FASA Dschang), pharmacy, nursing sciences, polytechnic engineering institutes (ENSPY), and geology/mining schools (EGEM Meiganga).

What is the official registration fee for the Cameroon Baccalauréat?

The official registration fee established by the OBC is 13,000 FCFA for regular school candidates, covering examination administrative costs, practical evaluations, and diploma issuance.

Is this practice bank an official examination paper?

No. The official Cameroon Baccalauréat is administered in French through written essay and problem-solving formats. This question bank is an independent English-language 4-option multiple-choice study adaptation designed to help students master core scientific concepts, calculation methods, and syllabus topics.

100+ Free Baccalauréat Série D Cameroun Practice Questions

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