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Main nitrogenous product formed in man is

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A plant which reproduces by means of spores Consider the following statements regarding microtubules and choose the correct answer: 1. The wall of a microtubule is made of 13 longitudinal filaments, each a polymer chain of tubulin 2. Microtubules help in the maintenance of cell form, cell mobility and movement of chromosomes 3. Microtubules occur only in bundles in the cytoplasm What is called movement of cell against concentration gradient ? The lichens, mycorrhizae and nitrogen fixing organisms have been classified under Prokaryotes don't have:________?