The science of life and of living organisms, including their structure, function, growth, origin, evolution and distribution. it includes Botany, Zoology, and Microbiology.

The History of Nucleic Acids

•1909,  Levene discovered D-ribose •1910, Kossel was awarded the Nobel Prize in Physiology or Medicine for research in nucleic acids. • 1912,  Levene  formulated his “ tetranucleotide  hypothesis” Two famous experiments: 1. 1944, Avery completed the transformation of Streptococcus  pneumoniae 2. 1952, Bacteria , T2 phages ,       DNA component with 32P       Protein component …

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Formation of male and female gametes . male and female germ cells (spermatocytes and primary oocytes) at the beginning of meiosis I replicate their DNA so that each of the 46 chromosomes is duplicated into sister chromatids. In contrast to mitosis, however, homologous chromosomes then align themselves in pairs, a process called synapsis. Homologous pairs …

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