LAB TECH ⚕️

446.Retention factor (Rf) in chromatography is defined as: A. Distance solvent traveled B. Ratio of solute to solvent front distance C. Peak width D. Solvent viscosity

445. Bacterial may acquire characteristics by all of the following EXCEPT: A. Taking up soluble DNA from the environment B. Through bacteriophages C. Through conjugation D. Incorporating part of host DNA

444. Virus mediated transfer of DNA from one cell to another is known as: A. Transfection B. Transduction C. Transformation D. Transcription

443. MacConkey agar is an example of: A. Enrichment medium B. Selective medium C. Differential medium D. Both “B” and “C”

442. Which of the following microorganism is used as indicator in autoclave? A. Clostridium tetani B. Bacillus stereothermophilus C. Bacillus anthracis D. Clostridium botulinum

441.Spreading process is used for which type of specimen? a. Sputum b. Urine c. Serous fluid d. Vaginal secretion

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The FDA has approved lenacapavir, a groundbreaking pre-exposure prophylaxis (PrEP) against HIV. Administered just twice yearly, studies show it's nearly 100% effective, earning it "breakthrough" status from the WHO. Crucially, this is for prevention, not treatment of existing HIV. A beacon of good n…

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440. Choose the correct ones for the decreasing order of resistance to sterilization: A. Prions, bacterial spores, bacteria B. Bacterial spores, bacteria, Prions C. Bacteria, Prions, Bacterial spores D. Prions, bacteria, bacterial spores

439. Which of the following statement is true? A. Solid media are enrichment media B. Nutrient broth is basal media C. Agar adds nutrient to media D. Chocolate agar is selective media

438. TNF is NOT involved in the which process? A. Chemotaxis of phagocytes B. Fever C. The inflammatory response D. The classic complement pathway

437. Which of the following is the end-product of the complement system? A. Properdin B. Cascade reaction C. Membrane attack complex D. Complement factor C9

436. _interferon, produced by T lymphocytes, activates cells called _and is involved in destroying viruses. A. Beta, lymphocytes B. Gamma, fibroblasts C. Alpha, natural killer cells D. Beta, fibroblasts