Ames Test – Introduction, Principle, Procedure, Uses and Result Interpretation

Ames Test Procedure

Ames test it is a biological assay to assess the mutagenic potential of chemical compounds. It utilizes bacteria to test whether a given chemical can cause mutations in the DNA of the test organism. The test was developed by Bruce N. Ames in 1970s to determine if a chemical at hand is a mutagen. Objective To determine …

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Difference between Replication and Transcription

Difference between Replication and Transcription

S.N. Characteristics Replication Transcription 1. Definition DNA replication is the process of making two daughter strand where each daughter strand contains half of the original DNA double helix. Transcription is the process of synthesis of RNA using DNA as a template. 2. Purpose To conserve the entire genome for next generation. To make RNA copies …

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Differences Between Cilia and Flagella

Differences Between Cilia and Flagella

Flagella are the complex filamentous cytoplasmic structure protruding through cell wall. These are unbranched, long, thread like structures, mostly composed of the protein flagellin, intricately embedded in the cell envelope. Cilia are slender, microscopic, hair-like structures or organelles that extend from the surface of nearly all mammalian cells (multiple or single). S.N. Characteristics Cilia Flagella …

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Different Size, Shape and Arrangement of Bacterial Cells

Different Size, Shape and Arrangement of Bacterial Cells

Bacteria are prokaryotic, unicellular microorganisms, which lack chlorophyll pigments. The cell structure is simpler than that of other organisms as there is no nucleus or membrane bound organelles. Due to the presence of a rigid cell wall, bacteria maintain a definite shape, though they vary as shape, size and structure. When viewed under light microscope, …

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Flagella – Introduction, Types, Examples, Parts, Functions and Flagella Staining- Principle, Procedure and Interpretation

Parts of Flagella

Introduction of Flagella Flagella are the complex filamentous cytoplasmic structure protruding through cell wall. These are unbranched, long, thread like structures, mostly composed of the protein flagellin, intricately embedded in the cell envelope.  They are about 12-30 nm in diameter and 5-16 µm in length. They are responsible for the bacterial motility. Motility plays an important …

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