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Q. Living beings are made of inorganic and organic substances. According to the molecular complexity how can each of those substances be classified?
Inorganic substances, molecular oxygen, mineral salts, like water, and carbon dioxide, are small molecules made of few atoms. Organic substances, in general, fatty acids like, glucose and proteins, are much more complex molecules made of sequences ofcarbons bound in carbon chains. The capacity of carbon to form chains is one of the major chemical facts that permitted the emergence of life on the planet.
Q. How are the nervous and the symmetry system characterized in echinoderms? Adult echinoderms, along with cnidarians, are the animals that present radial symmetry that is thei
Most of them happen on mucous membrane. Allergens enter the body by the process of inhalation or ingestion.
These circular orifices are located at the upper ends of the outflow parts of the left and right ventricles respectively. The pulmonary orifice which is 3 cms, is 0.5 cm larger tha
Which of the following is a false statement regarding the method of recombination or crossing-over? A. Crossing-over takes place during prophase I of meiosis B. Recombinatio
Q Why do protease-supplying cells of the stomach and of the pancreas make only precursors of the active proteolytic enzymes? The stomach and the pancreas make zymogens of the p
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What are some prophylactic measures for tapeworm infections? The main prophylactic measures against taeniasis and cysticercosis are: not to ingest raw or badly cooked swine or
Q. What are the major significant organic molecules for living beings? Ans. There are many types of organic molecules that are important for the living beings. Particularl
Available and Non-available Water You have seen above that water is present even in the apparently dry soils but it is of not much use as far as the plants are concerned. They
Cellular Transport Cellular transports demote to the movement of compounds across the outer wall or membrane of the cell. This transport is critical in two respects. Firstly, t
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