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- Angina pectoris is the medical term for chest pain or discomfort due to coronary heart disease.
- It occurs when the heart muscle doesn't get as much blood as it needs.
- This usually happens because one or more of the heart's arteries is narrowed or blocked, also called ischemia.
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Yogita Ingle 6 years 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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- 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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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.
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Yogita Ingle 5 years, 11 months ago
The lac operon of E. coli contains genes involved in lactose metabolism. It's expressed only when lactose is present and glucose is absent. The lac repressor acts as a lactose sensor. It normally blocks transcription of the operon, but stops acting as a repressor when lactose is present. The lac repressor senses lactose indirectly, through its isomer allolactose.
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