GBRC JRF Recruitment 2026: Complete Syllabus, 20-Question Mock Test & Interview Prep Guide

Recruitment Guide 2026

GBRC JRF Recruitment: Complete Screening Test Syllabus, 20-Question Mock Test & Interview Guide

Advertisement No: GBRC/Recruitment/2026/02 | Gujarat Biotechnology Research Centre

📌 Important Examination Notification Summary

• Post Name: Junior Research Fellow (JRF)
• Advt No.: GBRC/Recruitment/2026/02
• Exam Date: August 5, 2026
• Reporting Time: 08:30 AM
• Venue: GBRC, 6th Floor, MS Building, Sector 11, Gandhinagar - 382011
• Exam Format: Multiple-Choice Questions (MCQs) followed by Technical Interview
• Mandatory Items: Valid Photo ID (Aadhaar, Passport, etc.) and Examination Call Letter

📚 Detailed Subject & Topic Wise Syllabus Breakdown

To successfully crack the GBRC JRF screening test, candidates must focus their preparation on three core modules specified in the official syllabus layout:

1. Project Work & Practical Lab Techniques

• Master's Thesis / Project Methodology
• Buffer preparations & Dilution math (C₁V₁ = C₂V₂)
• Spectrophotometry & Fluorometry (A₂₆₀ / A₂₈₀ purity)
• Gel Electrophoresis (PAGE & Agarose)
• PCR, qPCR, and Primer Design
• Recombinant DNA Techniques & Cloning Vectors

2. Core Biological Sciences

• Molecular Biology: Replication, Transcription, Translation
• Biochemistry: Enzyme Kinetics (K_m, V_max), Metabolism
• Genetics: Mendelian Rules, Mutations, Gene Mapping
• Cell Biology: Cell Signaling, Apoptosis, Organelles
• Immunology: Antibodies, ELISA, Flow Cytometry

3. Related Fields & Applied Science

• Bioinformatics: BLAST, Sequence Alignments, Databases
• Biostatistics: t-test, ANOVA, Standard Deviation
• Advanced Tools: Next-Gen Sequencing (NGS), CRISPR-Cas9
• Microbiology: Cell Wall Chemistry, Culture Techniques

📝 Interactive Original 20-Question Mock Test

Practice with this full-length original mock test designed to match the difficulty level of GBRC previous screening exams. Click on "Show Answer & Explanation" under each question to verify your answers.

Q1. A researcher isolates a 5.0 kb plasmid containing a single restriction site for EcoRI and two restriction sites for BamHI spaced 1.5 kb apart. If digested completely with both enzymes, yielding fragments of 2.5 kb, 1.5 kb, and 1.0 kb, where is the EcoRI site located?

• A) Within the 1.5 kb BamHI fragment
• B) Exactly 1.0 kb away from one of the BamHI sites in the larger 3.5 kb region
• C) Overlapping with one of the BamHI recognition sequences
• D) It is impossible to obtain these fragments

Show Answer & Explanation

Correct Answer: B
Explanation: The two BamHI sites divide the 5.0 kb plasmid into 1.5 kb and 3.5 kb fragments. The single EcoRI site cuts within the larger 3.5 kb fragment, cleaving it into 2.5 kb and 1.0 kb pieces.

Q2. In qPCR using SYBR Green I chemistry, a candidate observes a double peak in the post-amplification melt curve. What does this indicate?

• A) High efficiency of Taq polymerase
• B) Formation of non-specific amplification products or primer-dimers
• C) Denaturation of target DNA at two distinct melting temperatures
• D) Contamination of EDTA in the reaction mix

Show Answer & Explanation

Correct Answer: B
Explanation: SYBR Green binds to all double-stranded DNA. Two distinct melting peaks denote two different DNA products (e.g., your target amplicon and non-specific primer-dimers).

Q3. Which enzyme mix is required in Gateway Cloning to transfer a gene of interest from an Entry Clone to a Destination Vector (LR Reaction)?

• A) Integrase (Int) and Excisionase (Xis) only
• B) BP Clonase enzyme mix
• C) LR Clonase mix containing Integrase (Int), Integration Host Factor (IHF), and Excisionase (Xis)
• D) T4 DNA Ligase and Alkaline Phosphatase

Show Answer & Explanation

Correct Answer: C
Explanation: The LR recombination reaction between attL and attR sites is catalyzed specifically by the LR Clonase enzyme mix (Int, IHF, and Xis).

Q4. A double-stranded DNA sample contains 28% Cytosine. According to Chargaff's Rules, what is the percentage of Adenine?

• A) 28%
• B) 22%
• C) 44%
• D) 56%

Show Answer & Explanation

Correct Answer: B
Explanation: %C = %G = 28%. Total G+C = 56%. Remaining A+T = 100% - 56% = 44%. Since %A = %T, Adenine = 44% / 2 = 22%.

Q5. In Blue-White screening, white colonies indicate successful recombinant transformation because:

• A) Ampicillin gene is inactivated
• B) Insertional inactivation disrupts α-complementation of β-galactosidase, preventing X-Gal cleavage
• C) X-Gal is utilized as a carbon source
• D) IPTG competitively inhibits β-galactosidase

Show Answer & Explanation

Correct Answer: B
Explanation: Inserting foreign DNA into the lacZα gene prevents functional β-galactosidase synthesis, leaving colonies white as X-Gal is not cleaved.

Q6. An enzyme reaction has a K_m of 2.5 × 10^-4 M. At a substrate concentration of 7.5 × 10^-4 M, what fraction of V_max will be achieved?

• A) 0.25 V_max
• B) 0.50 V_max
• C) 0.75 V_max
• D) 0.80 V_max

Show Answer & Explanation

Correct Answer: C
Explanation: Using v = (V_max × [S]) / (K_m + [S]) = (V_max × 7.5) / (2.5 + 7.5) = (7.5 / 10) V_max = 0.75 V_max.

Q7. What primary role does SDS play during protein denaturation in SDS-PAGE?

• A) Cleaves disulfide bonds
• B) Imparts a uniform negative charge-to-mass ratio to proteins while disrupting non-covalent bonds
• C) Acts as a pH buffer
• D) Binds to basic amino acids

Show Answer & Explanatio

Correct Answer: B
Explanation: SDS denatures proteins and confers a uniform negative charge density so migration speed depends strictly on molecular weight.

Q8. How many mL of a 1 M Tris-HCl stock solution are needed to prepare 250 mL of a 50 mM solution?

• A) 12.5 mL
• B) 25.0 mL
• C) 5.0 mL
• D) 1.25 mL

Show Answer & Explanation

Correct Answer: A
Explanation: C₁V₁ = C₂V₂ ⇒ (1000 mM) × V₁ = (50 mM) × (250 mL) ⇒ V₁ = 12.5 mL.

Q9. In Isoelectric Focusing (IEF), what happens when a protein reaches a pH gradient region equal to its pI?

• A) It gains a net positive charge
• B) It undergoes structural denaturation
• C) Its net charge becomes zero, halting movement in the electric field
• D) It binds irreversibly to gel ampholytes

Show Answer & Explanation

Correct Answer: C
Explanation: At pI (isoelectric point), a protein's net charge is zero, stopping its migration in an electric field.

Q10. Which chromatographic method relies on specific reversible binding between a target macromolecule and a matrix-bound ligand?

• A) Size-Exclusion Chromatography
• B) Ion-Exchange Chromatography
• C) Hydrophobic Interaction Chromatography
• D) Affinity Chromatography

Show Answer & Explanation

Correct Answer: D
Explanation: Affinity chromatography utilizes high-specificity biological interactions (e.g., Ni-NTA and His-tag, antibody-antigen).

Q11. What is the main function of flow cell adapters in Illumina Next-Generation Sequencing (NGS)?

• A) Act as fluorescent markers
• B) Hybridize to complementary oligos on the flow cell for bridge amplification
• C) Cleave single-stranded DNA
• D) Amplify bacterial contaminants

Show Answer & Explanation

Correct Answer: B
Explanation: Adapters bind to lawn oligos on the flow cell surface, allowing cluster generation via bridge PCR amplification.

Q12. Which BLAST program translates a nucleotide query in six reading frames to search against a protein database?

• A) BLASTn
• B) BLASTp
• C) BLASTx
• D) tBLASTn

Show Answer & Explanation

Correct Answer: C
Explanation: BLASTx translates a nucleotide query in all 6 reading frames and compares it against a protein database.

Q13. To compare plant growth means across three independent fertilizer treatment groups, which test is most appropriate?

• A) Paired t-test
• B) Student's t-test
• C) One-way ANOVA
• D) Chi-Square Test

Show Answer & Explanation

Correct Answer: C
Explanation: One-way ANOVA is used to determine statistically significant differences between the means of three or more independent groups.

Q14. In BLAST analysis, an E-value of 1 × 10^-20 indicates:

• A) 20% chance of incorrect alignment
• B) Very high statistical significance with minimal chance of random match
• C) 20% sequence identity
• D) Low alignment score

Show Answer & Explanation

Correct Answer: B
Explanation: An E-value near zero indicates an extremely low probability that the match occurred purely by random chance.

Q15. What short motif adjacent to the target sequence is strictly required for Cas9 protein binding and cleavage in CRISPR systems?

• A) TATA box
• B) Protospacer Adjacent Motif (PAM)
• C) Shine-Dalgarno sequence
• D) Polyadenylation signal

Show Answer & Explanation

Correct Answer: B
Explanation: Cas9 requires a PAM motif (e.g., 5'-NGG-3') downstream of the target site to recognize and cleave target DNA.

Q16. If a dsDNA sample gives an A₂₆₀ reading of 0.80, what is its concentration (given 1.0 A₂₆₀ = 50 µg/mL)?

• A) 25 µg/mL
• B) 40 µg/mL
• C) 50 µg/mL
• D) 80 µg/mL

Show Answer & Explanation

Correct Answer: B
Explanation: Concentration = 0.80 × 50 µg/mL = 40 µg/mL.

Q17. Which component of Gram-negative bacterial outer membranes acts as a major endotoxin triggering immune responses?

• A) Teichoic acid
• B) Peptidoglycan
• C) Lipopolysaccharide (LPS / Lipid A)
• D) Mycolic acid

Show Answer & Explanation

Correct Answer: C
Explanation: The Lipid A component of Lipopolysaccharide (LPS) acts as a strong endotoxin in Gram-negative bacteria.

Q18. Which enzyme catalyzes initial carbon dioxide fixation in the Calvin Cycle of photosynthesis?

• A) PEP carboxylase
• B) RuBisCO
• C) Malate dehydrogenase
• D) Transketolase

Show Answer & Explanation

Correct Answer: B
Explanation: RuBisCO catalyzes the fixation of CO₂ into 3-phosphoglycerate during dark reactions.

Q19. Which immunoglobulin class efficiently crosses the human placenta to provide passive immunity to the fetus?

• A) IgM
• B) IgA
• C) IgG
• D) IgE

Show Answer & Explanation

Correct Answer: C
Explanation: IgG is the only antibody class capable of crossing the placenta via specialized Fc receptors.

Q20. Why is Trypsin-EDTA added during subculturing of adherent mammalian cells?

• A) To neutralize culture toxins
• B) To cleave cell-adhesion proteins and chelate divalent cations for cell detachment
• C) To induce G2/M cell cycle arrest
• D) To supply essential nutrients

Show Answer & Explanation

Correct Answer: B
Explanation: Trypsin breaks cell-surface proteins while EDTA chelates Ca²⁺/Mg²⁺ ions necessary for cell adhesion.

🎙️ How to Clear the GBRC JRF Technical Interview

Shortlisted candidates post-screening will face an expert interview panel. Focus on these top interview preparation areas:

1. Explain Your Dissertation Project Confidently

Expect at least 50% of questions from your Master's research work. Be ready to explain your hypothesis, methodology, control setup, experimental limitations, and practical applications.

2. Practical Lab Troubleshooting Scenarios

Panels frequently evaluate real-time problem solving. Be ready to explain how you handle PCR non-specific bands, RNA degradation, low DNA yield, or Western Blot background noise.

3. Alignment with GBRC Thrust Areas

Familiarize yourself with GBRC’s focus domains: Marine Biotechnology, Agricultural Genomics, Environmental Diagnostics, and Human Pathogen Sequencing (BSL-2/BSL-3 operations).

❓ Frequently Asked Questions (FAQ)

Q1: What is the exam venue and time for GBRC JRF 2026?

The exam takes place at GBRC, 6th Floor MS Building, Sector 11, Gandhinagar-382011 on August 5, 2026. Reporting time is 8:30 AM.

Q2: What topics are covered in the GBRC JRF screening test?

The test covers practical project work/lab techniques, core life sciences (Molecular Biology, Genetics, Biochemistry), and related domains (Bioinformatics, Biostatistics).

Q3: What documents are mandatory on exam day?

Bring an official photo identity card (Aadhaar, Voter ID, Passport) along with a printed copy of your exam invitation call letter/email.

Best of luck with your GBRC JRF Examination!
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