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Yogita Ingle 7 years, 2 months ago
Viruses cause many human diseases. In addition to the flu and HIV, viruses cause rabies, measles, diarrheal diseases, hepatitis, polio, cold sores and other diseases . Viral diseases range from mild to fatal. Viruses may also cause disease without killing host cells. They may cause illness by disrupting homeostasis in host cells.
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Yogita Ingle 7 years, 2 months ago
- Mitochondria are round "tube-like" organelles that provide energy to a cell in the form of ATP (Adenosine Triphosphate) for performing different chemical activities for the sustainance of life.
- The mitochondria is also called powerhouse of the cell.
- It is surrounded by two membranes.
- The outer membrane is porous wherea the inner membrane has deep folds that provides a large surface to perform the chemical reactions required for the generation of ATP.
- The inner membrane is compartmentalized into various cristae.
- The ground substance or space enclosed by inner membrane is called matrix.
- Mitochondria have their own DNA and ribosomes and are hence capable to produce some of their required proteins all by themselves.
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Yogita Ingle 7 years, 3 months ago
The following properties are defining features of a living
(i) Growth All living organisms show growth either by multiplication or by increase in size. Growth in living things is internal.
(ii) Reproduction All living things produce off springs, possessing features similar to their parents. Thus reproduction is essential to maintain the continuity of life on the earth.
(iii) Metabolism It is the sum total of reactions occurring inside the body by which living things assimilate energy and use it for growth.
(iv) Cellular organisation The cells are the structural and functional unit of living organism.
Posted by Ashwin Poudel 7 years, 3 months ago
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Yogita Ingle 7 years, 3 months ago
Moisture is presence of water in the air. Water is a combination of two molecules of hydrogen and one molecule of oxygen. This bond is so strong that even after billions of years, it will remain intact. 70% of the Earth is covered with water. Moisture or water in the form of gas is a crucial and necessary element in our Earth’s atmosphere. Moisture is everywhere. It causes humidity, making us feel sticky and hot.
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Madire Veeresh 7 years, 1 month ago
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