Tag Archives | Microbiology

Types of Transduction: Generalized and Specialized | Genetics

Transduction is of two types, generalized transduction and specialized transduction. Type # 1. Generalized Transduction: Generalized transduction was discovered in 1952 by Norton Zinder and Joshua Lederberg. They were repeating the experiments of Lederberg and Tatum (1946) on conjugation that occurred in E.coli K12 taking another bacterium Salmonella typhimurium. They selected the following two strains of S. typhimurium: (a) The [...]

By |2016-11-28T11:04:43+00:00November 28, 2016|Genetics|Comments Off on Types of Transduction: Generalized and Specialized | Genetics
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Transposons: Types of Transposons | Genetics

Transposons are of two types, composite transposon and complex transposon. 1. The Composite Transposons: The composite transposons are those which consist of a central region carrying antibiotic resistant genes flanked at both the ends by identical copies of an IS element Therefore, composite transposons carry drug resistance or other markers in addition to transposition (Fig. 8.32A). It is a class [...]

By |2016-11-28T11:04:43+00:00November 28, 2016|Genetics|Comments Off on Transposons: Types of Transposons | Genetics
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DNA Forms: 7 Main Forms of DNA | Biochemistry

The most common form of DNA which has right handed helix and proposed by Watson and Crick is called B-form of DNA or B-DNA. In addition, the DNA may be able to exist in other forms of double helical structure. These are A and C forms of double helix which vary from B- form in spacing between nucleotides and number [...]

By |2016-11-28T11:04:43+00:00November 28, 2016|DNA|Comments Off on DNA Forms: 7 Main Forms of DNA | Biochemistry
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