Bacterial Identification Virtual Lab 2026 – 40 Exam Questions – PCR, 16S rDNA & BLAST Analysis – Molecular Biology Practical

This document contains 40 structured exam questions and expert-verified answers covering the complete Bacterial Identification Virtual Lab for 2026. It thoroughly reviews the full molecular workflow, including DNA extraction from bacterial samples, centrifugation (pellet vs. supernatant), PCR amplification of 16S rDNA (~1500 bp), use of universal primers targeting highly conserved regions, analysis of highly variable regions for species identification, gel electrophoresis confirmation, cycle sequencing with fluorescence-tagged terminators, and final bioinformatics analysis using BLAST. The material is aligned with standard undergraduate Molecular Biology and Microbiology laboratory curricula and reflects techniques commonly taught in courses using PCR, electrophoresis, DNA sequencing, and database sequence comparison. It reinforces key laboratory principles such as master mix composition, PCR cycle parameters (95°C denaturation, 60°C annealing, 72°C extension), positive and negative controls, sequence alignment scoring (bits), E-value interpretation, and evolutionary assumptions based on nucleotide divergence. The final organism identified in the lab is Bartonella henselae, a Gram-negative bacterium relevant to clinical microbiology and molecular diagnostics. This study guide is particularly suitable for: Microbiology students Molecular biology students Genetics and genomics students Pre-med and biomedical science majors Biotechnology trainees Clinical laboratory science students Health science students completing virtual lab assessments It is relevant for courses such as: General Microbiology Laboratory Molecular Biology Lab Genetics and Genomics Biotechnology Techniques Clinical Microbiology DNA Sequencing and Bioinformatics The structured question-and-answer format makes this resource ideal for exam preparation, lab practical review, and reinforcement of molecular identification techniques used in modern clinical and research laboratories. Keywords: Bacterial Identification Virtual Lab, PCR Amplification, 16S rDNA, DNA Extraction, Gel Electrophoresis, Cycle Sequencing, Fluorescent Terminators, BLAST Analysis, Homology, E-value, Master Mix, Positive Control, Negative Control, Molecular Diagnostics, Bioinformatics, Bartonella henselae, DNA Sequencing, Microcentrifuge, Supernatant, Pellet