I f you need to know the exact times that the markets open and close, you have to take time zones into consideration. It is very simple when expressed in GMT. This is Greenwich Mean Time. This is the standard (winter) time in Greenwich, London which is the point of zero longitude on the globe. The normal Forex market hours are 22.00 Sunday GMT to 22.00 Friday GMT.
Genes are made of a chemical called DNA, which is short for 'deoxyribonucleic acid'. The DNA molecule is a double helix: that is, two long, thin strands twisted around each other like a spiral staircase.The DNA double helix showing base pairs. The sides are sugar and phosphate molecules. The rungs are pairs of chemicals called 'nitrogenous bases', or 'bases' for short.There are four types of base: adenine (A), thymine (T), guanine (G) and cytosine (C). These bases link in a very specific way: A always pairs with T, and C always pairs with G. The DNA molecule has two important properties.he rungs are pairs of chemicals called 'nitrogenous bases', or 'bases' for short. There are four types of base: adenine (A), thymine (T), guanine (G) and cytosine (C). These bases link in a very specific way: A always pairs with T, and C always pairs with G. The DNA molecule has two important properties.
Due to an arrangement of their molecules, adenine (A) can form unique hydrogen bonds with thymine (T), and cytosine (C) with guanine (G). A and T can form 2 hydrogen bonds, and C and G can form three. If a sequence of bases on one strand of DNA is CTGCTA, then the other DNA strand will be GACGAT. The Structure of DNA, RNA, and DNA's Arrangement in Cells. DNA is Composed of Four Types of Nucleotides. Since the 1920's, scientists have known that the DNA molecule is a very long polymer, or string of repeating units. The small units, or monomers that make up DNA are called nucleotides.