Bacterial Identification Lab 2026 – 45 Exam Questions – PCR, 16S rDNA & DNA Sequencing – Molecular Biology Practical

This document contains 45 structured exam questions and verified answers covering the Bacterial Identification Virtual Lab for 2026. It comprehensively reviews DNA extraction, centrifugation (pellet vs. supernatant), PCR amplification, 16S rDNA analysis, gel electrophoresis, sequencing techniques, BLAST database comparison, homology interpretation, E-values, and evolutionary relationships based on nucleotide differences. The material follows the full molecular workflow: sample preparation, DNA isolation, PCR using universal primers targeting highly conserved and highly variable regions of 16S rDNA (~1500 bp), purification using microconcentrator columns, cycle sequencing with fluorescent terminators, laser detection of nucleotide sequences, and species identification using BLAST (Basic Local Alignment Search Tool). It reinforces both laboratory technique and conceptual understanding of molecular identification methods used in clinical and research microbiology. This study guide is particularly suitable for: Microbiology students Molecular biology students Pre-medical and biomedical science students Clinical laboratory science students Biotechnology trainees Health sciences students completing virtual lab simulations It is relevant for courses such as: General Microbiology Lab Molecular Biology Laboratory Genetics and Genomics Biotechnology Techniques Clinical Microbiology DNA Sequencing and Bioinformatics The question-and-answer format supports exam preparation, lab practical review, and conceptual reinforcement of PCR cycles (denaturation, annealing, extension), control tube interpretation (positive vs. negative controls), electrophoresis analysis, fluorescence-based sequencing, and bioinformatics-based bacterial identification. The final organism identified in the lab is Bartonella species, emphasizing real-world pathogen identification using molecular diagnostics. Keywords: Bacterial Identification Lab, PCR Amplification, 16S rDNA, DNA Extraction, Gel Electrophoresis, Sequencing Brew, Cycle Sequencing, Fluorescent Terminators, BLAST Analysis, Homology, E-value, Positive Control, Negative Control, Microcentrifuge, Supernatant, Pellet, Molecular Diagnostics, Bioinformatics, Bartonella species, DNA Sequencing