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Q. Illustrate the tyndallisation?
John Tyndall devised a process of sterilisation by steaming for a few minutes at 100o C on 3-4 successive operations separated by 24 hour intervals at room temperatures. The principle is that the first exposure kills all vegetative bacteria; spores will germinate and be killed on subsequent occasions.
How do bacteria reproduce? Bacteria replicate by binary fission (scissiparity). Some bacteria though present a kind of sexual reproduction (transformation, transduction or conj
Transposable elements are able to move around the genome by precise or imprecise excision events. What is meant by imprecise excision? A. Imprecise excision refers to a transpo
Q. What is the function of the umbilical cord? The umbilical cord is a set of blood vessels that connects the fetus with the placenta and in the fetus one extremity of the cord
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What is the Importance of pantothenic acid One of the active forms of pantothenic acid is coenzyme A, which is involved in numerous metabolic functions. It is involved in t
How is a disease-resistant plant selected for successful breeding? Why is the process of fertilisation in a flowering plant referred to as double fertilisation? Explain. Nam
Enzymes are proteins that are catalysts of chemical reactions. From Chemistry, it is called that catalysts are non-consumable substances that decrease the activation energy essenti
Pollinia and Massulae In most cases the pollen grains of each tetrad become separated from one another and they lie freely in the pollen sac. In some plants, mostly members of
Describe the Initiation of Visual Impulse When light falls on the retina it is absorbed by the photosensitive pigments of rods (rhodopsin) and cones (photopsin). It initiates
PSYCHOSOCIA L PROBLEMS - 1 . Accidental injury - Automobile accidents are no. 1 killers of adolescents, as they drive often fast. 2 . Depression - I
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