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Explain the Gram Staining technique?
Gram staining is a differential staining procedure which divides bacteria into two groups: Gram positive and Gram negative, based on staining properties. The gram stain was developed in 1884 by the Danish Physician, Dr. Christian Gram. It is one of the most important and widely employed staining procedure in bacteriology.
It is very useful and is almost essential in identifying an unknown bacteria. The basis of gram staining is the difference in cell wall composition of two types of bacterial cells. Gram positives have thick cell wall, made up of multi-layered peptidoglycan with extensive cross-linking. On the other hand, gram negative cell wall has a very thin peptidoglycan layer surrounded by outer lipid rich outer membrane. There is no outer membrane in case of gram positives. This difference in cell wall leads to decolourization of gram negatives but not gram positives by decolourizing agent i.e., ethanol or acetone.
Explain about the Complete proteins? We now know that proteins are composed of amino acids and that proteins differ in their amino acid make-up. Proteins lacking in one or more
Body systems and organs and their functions The human body is a large structural unit made up of many smaller parts. There are four kinds of smaller units - cells, tissues, org
Q. What are the main types of waste? The waste can be classified into many kinds, each of them carrying its own different environmental problem: recyclable waste, organic waste
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Define the Functional Properties of Proteins? a) Hydration properties (dependent on protein-water interactions), which include properties like swelling, adhesion, dispersibilit
There are three methods of collections: 1. Kerbside collection: In this collection system the refuse is brought in containers and placed on the footway, from where it is
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What is the control center of the cell? The nucleus contains DNA, which having the instructions for all the functions of the body.
A student while studying the anatomy of leaves of four specimens (P - S), observed the following characters: P. Reticulate venation and no bundle sheath. Q. Parallel venati
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