Blood agar is classified as what type of bacteriological medium________________?
Show answer Hide answer
Answer: C. Enriched media
Explanation
Blood agar is categorized as an enriched medium because it contains added nutrients supporting fastidious organisms. Defibrinated mammalian blood supplies essential growth factors and proteins that simple basal media lack entirely. This rich formulation allows various clinically important bacteria with complex nutritional needs to grow successfully. Bacteriological media are classified based on their composition and purpose, ranging from simple to highly specialized formulations. Enriched media provide extra nutritional support such as blood, serum, or yeast extract to encourage bacterial growth. Many pathogenic bacteria require these supplemented environments because they cannot synthesize necessary growth factors independently.
Simple media provide basic nutritional requirements without extra supplements, supporting only non-fastidious bacterial species growth. Transport media are chemically balanced solutions designed to maintain bacterial viability during transit without encouraging multiplication. Differential media contain specific indicators that allow laboratories to visually distinguish between different bacterial metabolic types.
Related questions
Q1. What is the typical CD4+ T-lymphocyte count in a healthy adult_______________?
Show answer Hide answer
Answer: C. 1000
A typical healthy human adult possesses a circulating CD4+ T-lymphocyte count averaging around 1000 cells per microliter. Normal reference ranges for CD4 counts generally span from 500 to 1500 cells per microliter of blo...
Q2. A woman receives an ovarian transplant from her monozygotic (identical) twin sister. What type of transplant graft does this represent ?
Show answer Hide answer
Answer: D. Isograft
Grafts transferred between genetically identical monozygotic twins are classified as isografts. Monozygotic twins share virtually identical genetic sequences and histocompatibility antigens. This genetic identity prevent...
Q3. What is the most effective sterilization method for disposable plastic syringes_______________?
Show answer Hide answer
Answer: C. Gamma rays
Gamma rays penetrate sealed packaging to sterilize items without generating high thermal energy. Disposable plastic syringes melt or warp when exposed to conventional steam autoclaving heat. Option C is correct because i...
Q4. Certain viruses isolated and crystallized in laboratory settings have been shown to be_____________?
Show answer Hide answer
Answer: D. Nucleoproteins
Crystallized viruses consist structurally of nucleic acid genomes enclosed within a protective protein capsid shell. This macromolecular combination of nucleic acid and protein correctly defines them chemically as nucleo...
Q5. CD4+ T-cells recognize foreign antigens presented in conjunction with_____________?
Show answer Hide answer
Answer: B. MHC II
CD4-positive helper T cells are specialized to recognize exogenous antigens. These antigens must be presented on the cell surface bound to major histocompatibility complex class II molecules. This molecular interaction i...
Q6. All of the following are characteristic properties of exotoxins except_______________?
Show answer Hide answer
Answer: A. Protein polysaccharide complex
Exotoxins are composed entirely of proteins rather than protein-polysaccharide complexes. Lipopolysaccharide structures are characteristic features of bacterial endotoxins found in gram-negative walls. Option A represent...