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    				| 1. | 
                                    In a nucleus, the number of ribonucleoside triphophates is 10 times the number of deoxy `xx10` ribonucleoside triphosphaes, but only deoxy ribonucleotides are added during the DNA replication. Suggest a mechanism. | 
                            
| Answer» DNA polymerase enzyme is highly specific to recognise only deoxy ribonuceoside triphosphates. Therefore, it connot hold RNA`beta`-nucleotides. | |