Science and Technology | Current Affairs October 2021

 Science and Technology | Current Affairs  

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Dengue Introduction

The dengue viruses are parts of the genus  Flavivirus  in the family  Flaviviridae . Onwards with the dengue virus, this genus also contains a number of other viruses transmitted by mosquitoes and ticks that are responsible for human diseases.  Flavivirus  includes the yellow fever, West Nile, Japanese encephalitis, and tick-borne encephalitis viruses. The dengue virus is a tiny structure that can only replicate inside a host organism. The four almost related dengue viruses — DEN-1, DEN-2, DEN-3, and DEN-4 — are found in the same regions of the world. The dengue virus is an approximately spherical structure composed of the viral genome and capsid proteins surrounded by an envelope and a shell of proteins. Subsequently infecting a host cell, the dengue virus hijacks the host cell's machinery to replicate the viral RNA genome and viral proteins. After maturing, the newly  amalgamated dengue viruses are released and go on to infect other host cells. Dengue fe...
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Revision of Carbon and Its Compounds F

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 4. Carbon and Its Compounds   Specific Properties of Ethanoic Acid     Soaps and Detergents   Uniqueness of Carbon   Formation of Covalent Bonds   Difference Between Ionic and Covalent Bonds   Electron Dot Structure   Saturated and Unsaturated Carbon Compounds   Chains, Branches and Rings   Homologous Series of Carbon Compounds   Nomenclature of Carbon Compounds   Specific Properties of Ethanol   General Properties of Carbon Compounds Lesson:  Carbon and its Compounds Question: 1 Ethane, with the molecular formula  C 2 H 6   has: (a) 6 covalent bonds. (b) 7 covalent bonds. (c) 8 covalent bonds. (d) 9 covalent bonds. Solution: b Question:2 Butanone is a four-carbon compound with the functional group: (a) Carboxylic acid (b) Aldehyde (c) Ketone (d) Alcohol Solution: c Question:3 While cooking, if the bottom of the vessel is getting blackened on the o...
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