[mÌ¥ÉÌÅ]) are an ethnic group from the mountainous regions of China, Vietnam, Laos, and Thailand. Hmong are also one of the sub-groups of the Miao ethnicity (èæ) in southern China. Hmong groups began a gradual southward migration in the 18th century due to political unrest and to find more arable land.
In this way a DNA molecule is similar in structure to a ladder in which the sugar and phosphate groups make the uprights and the nitrogen base groups the rungs. There are four types of nitrogen bases or base groups. 1  Adenine (A). 2  Thyamine (T).3  Cytosine (C). 4  Guanine (G).he nucleotides in the DNA molecule are linked in series from one phosphate, to the next sugar, to the next phosphate and so on. The DNA molecule can be considered as a ladder with the phosphate and the sugar molecules making up the uprights and the bases making up the rungs.
In this model of a very short section of DNA you can see how the A-T and C-G base pairs make up the rungs of the ladder and the sugars and phosphates make up the two long strands.hese two models shows how all the atoms of the sugars, phosphates and nitrogenous bases fit together to make the spiral staircase or twisted ladder shape first suggested by the x-ray diffraction pictures of DNA taken by Rosalind Franklin and Maurice Wilkins.