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Which type of cell came first in evolution - the eukaryotic cell or the prokaryotic cell?
This is an interesting problem of biological evolution. The most accepted hypothesis asserts that the simpler cell, the prokaryotic cell, appeared earlier in evolution than the more difficult eukaryotic cell. The endosymbiotic hypothesis, for instance, affirms that aerobic eukaryotic cells appeared from the mutualist ecological interaction among aerobic prokaryotes and primitive anaerobic eukaryotes.
The nerve centres which control the body temperature and the urge for eating recontained in: 1. Hypothalamus 2. Pons 3. Cerebellum 4. Thalamus Hypothalamus is the
Q. Concentration of mental effort? Attention can be defined as "the concentration of mental effort on sensory or mental events. There are three types of attention selective
IAA Stimulates Cell Enlargement Cell wall contains layer of cellulose fibrils and are normally quite rigid. Thus for a cell to grow, there must be a mechanism for relaxing th
Salmonellosis Salmonellosis is an infection caused by bacterial species belonging to the genus Salmonella and usually associated with the ingestion of food containing salmonel
Importance of water in the body Water is the most essential constituent of life. Life cannot exist without water. About 90% of water is present in protoplasm Water
Q. What is the life cycle of a tapeworm? The Pregnant proglottids with taenia eggs are released together with human feces. If ingested by the intermediate hosts, bovineor swine
Q. To increase the strength of the muscle work is the muscle contraction intensely increased? An increase in the strength of the muscle work is not achieved by increase in the
What do you understand by Coelenteron? The name given to internal cavity of the cnidarians. This is an incomplete gut with just one opening, the mouth. Food to be digested and
Which of the following is true for exocytosis? A. During exocytosis in skeletal muscle cells, there will be release of calcium ions from intracellular vesicles in the sarcoplas
Explain the Regulation of blood pressure? The renin-angiotensin system regulates the blood pressure. The synthesis of renin is decreased by calcitriol through its interaction
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