All but which one of the following bacterial structures are external to the cell

Question

All but which one of the following bacterial structures are external to the cell? a. flagellum b. pilus c. plasmid d capsule e. peptidoglycan Which of the following is NOT a functionally pair? a. nucleus - nucleiod region b. mitochondria -prokaryotic plasma membrane c. 9 + 2 flagella bacterial flagella d. cilia - fimbrine e. 70S ribosome- 80S ribosome Which microscope achieves the highest magnification and greatest resolution? a. compound light microscope b. phase-contrast microscope c. scanning acoustic microscope d. fluorescence microscope e. electron microscope Into which group would you place a multicellular organism that has a mouth and liver? a. Animalia b. Fungi c. Plantae d. Firmicutes (gram-positive) e. Proteobacteria (gram-negative) Each of the following statements concerning the gram-positive cell wall is a. it maintains the shape of the cell. b. it is sensitive to lysozyme. c. it has only one layer of peptidoglycan d. it contains teicho

Explanation / Answer

Answer 51: Plasmid. Plasmid can function externally as vector, since it has single and circular DNA stranded. Other option provided are external structures. A flagellum is a tailed structure that helps in cell movements. A pilus is a hair like appendages on the surface that plays vital role in reproduction via conjugation. Capsules and peptigolycan are layers on the outer wall for cell rigidity and stability.

Answer 52: D (Cilia-fimbriae). Cilia is special structure that is present in the outer layer of bacteria and helps in movement of bacterial cells. However, fimbriae are the extension that assists bacteria in reproduction by conjugation.

Answer 53: E (Electron Microscope). They have very low wavelength, which is 100000 times lighter compared to light. This ability makes them possess high resolution with great magnifications (X 500000).

Answer 54: A (Animalia). Parasite that invades and lives in liver cells belongs to phylum platyhelminths. They are generally also called as flat-worms.

Answer 55: C. Gram-positive cell wall has multiple players of peptidoglycans on the surface.

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