Microbiology - MCQ Practice Questions

Which of the following bacteria is gram-positive and forms spores?

The cell wall of bacteria primarily contains which polysaccharide?

Which virus is responsible for causing COVID-19?

Which of the following bacteria causes tuberculosis in humans?

Which bacterial structure is responsible for motility in most bacteria?

Which virus is a retrovirus and causes AIDS?

Which virus causes chickenpox and shingles?

Which statement correctly describes the difference between prokaryotic and eukaryotic cells?

Which of the following bacterial structures is responsible for horizontal gene transfer through direct cell-to-cell contact?

Which bacterial genus produces endospores as a survival mechanism under nutrient-depleted conditions?

Which virus possesses a segmented genome and is responsible for causing influenza pandemics?

A gram-positive coccus forms grape-like clusters and produces alpha-toxin. Which pathogen is being described?

Which viral protein is responsible for recognizing and binding to host cell receptors during viral attachment?

A bacterial colony on blood agar shows beta-hemolysis and is catalase-positive, coagulase-positive. Which species is confirmed?

Which of the following bacterial cell wall components is responsible for the Gram-positive purple coloration in Gram staining?

Which bacterial flagellar arrangement allows movement in a single direction with maximum efficiency?

Which bacterial spore-forming genus is most commonly associated with food poisoning and produces heat-resistant endospores?

Which viral component is essential for attachment to host cell receptors and is the primary target for neutralizing antibodies?

Which mycobacterial lipid component provides acid-fastness and represents a major virulence factor?

A laboratory identifies a Gram-positive coccus in clusters that produces alpha-hemolysis on blood agar and coagulates plasma. What is the most probable identification?