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The nitrogenase complex is extremely sensitive to inactivation by O2, so the enzyme must be protected from this reactive substance. During the root nodules of leguminous plants, protection is afforded by the symbiotic synthesis of leghemoglobin. The globin part of this monomeric oxygen-binding protein is synthesized by the plant, whereas the heme group is synthesized by the Rhizobium. Leghemoglobin has a very high affinity for O2 for maintaining a low enough concentration to protect the nitrogenase.
Q. What similarities do reptiles and birds share regarding external coverage, reproduction and excretion? Regarding external coverage, birds are similar to reptiles as they pre
A large leaf on a plant in bright sunshine evaporates 5 grams of water per hour. Cooling the leaf through evaporation in this manner enables the plant to eliminate heat energy at t
Sickle cell anaemia in man is caused by a defective chain of haemoglobin. The abnormal haemoglobin known as MbS differs from natural haemoglobin (HhA) in one amino acid. A substitu
Phospholipids exhibit important biological functions. They are: a) increase the rate of fatty acid oxidation b) act as inorganic ion carrier across the membrane c) hel
Auxins The history of discovery of auxin is a fascinating chapter in plant physiology. The hormone auxin was discovered first, through some elegant experiments by Charles Darw
Pyridoxal phoshphate Pyridoxal phosphate is derived from pyridoxine (vitamin B6) and is involved in amino acid metabolism. The other two compounds, pyridoxal and
What are Taxonomic characters Taxonomic characters Classification is done on the basis of information we have. More information gives better classification. Modern taxonomy
Describe how the International Astronomical Union defines a planet. Also include why Pluto is no longer considered a planet.
Describe the types of Drugs • Induction agent (thiopentone, fentanyl, ketamine, midazolam) • Suxamethonium (1-2 mg/kg) is the muscle relaxant of choice. Rapid sequence ind
What is an analogy for a smooth endoplasmic reticulum? Endoplasmic reticulum (ER) is such as a manufacturing plant, like a factory, where proteins and lipids are made. This is
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