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One of man's oldest methods of preserving foods is drying or desiccation. The preservation of foods by drying is a direct result of removal of moisture. Microorganisms need water for growth. The exact amount of water needed for growth of microorganisms varies. This water requirement of microorganisms is best expressed in terms of available water or water activity aw, the vapour pressure of the solution (of solutes in water in most foods) divided by the vapour pressure of the solvent (usually water). Thus aw, for pure water would be 1.00. The water activity depends on the number of molecules and ions present in solution, rather than their size. Thus a compound like sodium chloride, which dissociates into two ions in solution, is more effective at reducing the water activity than a compound like sucrose on mole-to-mole basis.
Satellite DNA is useful tool in: 1. Organ transplantation 2. Sex determination 3. Forensic science 4. Genetic engineering Forensic science
Q. How is the gymnosperm seeds formed? What are the ploidies of the structures that compose the seeds? Their seeds are produced from differentiation of the megasporangia in the
Carrier ions like Na+ facilitate the absorption of substances like: 1. amino acids and glucose 2. glucose and fatty acids 3. fatty acids and glycerol 4. fructose and so
describe how ulcers can lead to distention and irritation followed by vomiting?
Explain function of lymph nodes? Lymph nodes have white blood cells which ingest bacteria and prevent them from reaching the circulation.
In a neuron with a resting potential of -65 mV, the distribution of which ion across the neuronal membrane represents the LEAST potential electromotive force (EMF)? A. Potassium
Determine the term - Chlorine The application of chlorides results in leaves of greater spread, a lighter green colour and with a smoother surface. However, the combustibilit
Illustrate metabolic processes of vitamin B In the human and animal metabolism, they form a functional unit, since, as components of the various coenzymes, they are essential
Q. Is water a non-polar or a polar molecule? What is the consequence of that characteristic for the function of water as solvent? Ans. Water is made of two atoms of hydrog
what is the excretory organ of lizard
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