1. what is the role of nitrogen fixing bacteria?
2. what does DNA molecule contains? Name the functional segment of DNA. In which form DNA present in a cell when the cell is not dividing?
3. Give three similarities and one difference between mitochondria and plastics?
4. Why simply increasing grain production for storage in warehouses cannot solve the problem of malnutrition nd hunger?
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Answers
1.Nitrogen – Fixing Bacteria
Organisms that is responsible for nitrogen fixation belong to the group of prokaryotes. Their main function involves the conversion of stable nitrogen gas in the atmosphere to a biologically useful form. Nitrogenase is an enzyme complex that reduces dinitrogen to ammonia.
A huge amount of energy is consumed during the nitrogen fixation and the nitrogenase enzymes are irreversibly inactivated by oxygen.
2.DNA (deoxyribonucleic acid) is a double helix molecule made up of long chains of nucleotides. ... It can also be defined as the segment of DNA which codes for a particular molecule. DNA is present as chromatin fiber in non-diving cells. It is formed with the help of nucleosomes
3.Both mitochondria and plasmids have some of their own DNA for protein synthesis hence they are called as semi autonomous cell organelles. The difference between plastid and mitochondria is that plastid are found in plant cells and mitochondria are found in both plant and animal.
4. because quality matters more than the quantity simply increasing the grain production and not increasing the quality of the food will definitely lead to malnutrition and hunger
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