قوة اللغة العربية فى بيت المتنبى
قوة اللغة العربية فى بيت المتنبى
من الصعب نطقها من أول مرة .....
من الصعب نطقها من أول مرة .....
DNA Replication
DNA Replication 1. Description of DNA Replication The human body produces billions of new cells every day. But before undergoing cell division, a cell must first copy the genetic information contained in the cell nucleus – its DNA. In just 6-8 hours a cell is able to copy its entire genome. To accomplish this, DNA replication begins at multiple locations along each chromosome. As the two DNA strands are pulled apart, copying begins at the rate of about 50 nucleotides per second! DNA Basics DNA encodes the information needed to build proteins, to regulate physiological processes and maintain homeostasis in our bodies. The basic chemical components of DNA are phosphate , deoxyribose (a sugar) and 4 nitrogenous bases: adenine (A), guanine (G), cytosine (C) and thymine (T) . DNA is a double stranded molecule with the two strands lying antiparallel to each other (they lie parallel t...
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