Which of the following structures allows the motility of the microbes and requires the use of Mordant to view? A. Cilia B. Capsule C. Flagella D. None of the above

Why is a capsule difficult to stain? A. Capsules are water soluble B. Capsules become gelatinous in media C. They are not difficult to stain D. None of the above

Reducing media is used to support the growth of aerobic microbes. True/False

False

Staphylococcus aureus ferments mannitol salt and turns the agar what color? A. Blue B. Red C. Pink D. Yellow

Blood agar is a combination of nutrients and the erythrocytes from what animal? A. Cat B. Cow C. Sheep D. Horse

Catalase positive results are marked by the appearance of what? A. CO2 B. Steam C. Bubbles D. Salt

When performing a coagulase test, if plasma clumps together it is most likely indicative of what microbe? A. E. Coli B. S. aureus C. S. cocci D. None of the above

Which term best describes an organism that can grow without oxygen but uses it if available? A. Aerotolerant anaerobe B. Microaerophile C. Facultative anaerobe D. Obligate aerobe

Which process enables genetic diversity in bacteria through transfer of genetic material between cells? A. Transduction B. Transformation C. Binary fission D. Conjugation (plasmid transfer)

Horizontal gene transfer in bacteria results in what type of genetic outcome? A. Prophage integration only B. Decreased mutation rates C. Loss of plasmids D. Increased genetic diversity within a population

Which pathogen type is most commonly associated with candidiasis in humans? A. Bacteria B. Viruses C. Protozoa D. Fungi (candida species

Which antibiotic target is most closely associated with inhibiting bacterial cell wall synthesis? A.Beta-lactams (penicillins) B. Aminoglycosides C. Quinolones D. Tetracyclines

Which immune response involves antibodies produced by B cells? A. Innate immunity B. Humoral immunity C. Passive immunity D. Cell-mediated immunity

Which bacterial structure enables survival in harsh environments by entering a dormant state? A. Endospore B. Capsule C. Biofilm D. Plasmid

During which bacterial growth phase is the population increasing most rapidly? A. Lag phase B. Stationary phase C. Death phase D. Log (exponential) phase

What is the primary function of the bacterial ribosome? A. Synthesize proteins B. Copy DNA into RNA C. Degrade mRNA D. Transport molecules across the membrane

Which structure on bacteria primarily mediates attachment to surfaces and host tissues? A. Cell wall peptidoglycan B. Fimbriae (pili) C. Flagella D. Capsule

Which chemical is commonly used to disinfect surfaces and antiseptics due to broad antimicrobial action? A. Hydrogen peroxide B. Heavy metals C. Alcohols (e.g., ethanol) D. Chlorine bleach

In a closed microbial culture, what event causes growth to slow and cells enter a stationary phase? A. Increased oxygen diffusion B. Temperature shift C. Nutrient depletion and waste accumulation D. Spontaneous mutation

What cellular feature largely determines Gram staining outcome in bacteria? A. Outer membrane composition B. Capsule presence C. Ribosome type D. Peptidoglycan layer structure and thickness

Which viral component is essential for recognizing and binding to host cells? A. Viral attachment proteins (glycoproteins) B. Matrix proteins C. Nucleic acid core D. Capsid only

Which method is most effective for sterilizing heat-sensitive liquids without destroying their essential components? A. Autoclaving B. Filtration (sterile filtration) C. Desiccation D. Pasteurization

What term describes the complete set of genetic material within a cell or organism? A. Genome B. Proteome C. Transcriptome D. Metabolome

For observing the smallest viral particles, which microscopy technique is most suitable? A. Light microscopy with oil immersion B. Electron microscopy C. Phase-contrast microscope D. Scanning electron microscopy only

Viruses require which of the following to carry out replication? A. Synthetic ribosomes B. Oxygen-free environment C. A living host cell’s machinery D. Their own metabolism

Which pathway is most directly linked to ATP production in aerobic respiration? A. Krebs cycle only B. Glycolysis C. Fermentation D. Oxidative phosphorylation (electron transport chain)

Which bacterial toxin is released when cells lyse, contributing to disease symptoms? A. Cytotoxin B. Neurotoxin C. Endotoxin D. Exotoxin