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Alongside proteins , lipids and complex carbohydrates polysaccharides , nucleic acids are one of the four major types of macromolecules that are essential for all known forms of life. The two DNA strands are known as polynucleotides as they are composed of simpler monomeric units called nucleotides. The nucleotides are joined to one another in a chain by covalent bonds known as the phospho-diester linkage between the sugar of one nucleotide and the phosphate of the next, resulting in an alternating sugar-phosphate backbone. The nitrogenous bases of the two separate polynucleotide strands are bound together, according to base pairing rules A with T and C with G , with hydrogen bonds to make double-stranded DNA.
25 Tips for a First Date after Meeting Online to Have a Great Time
10 Reasons Why You Should Call Your Online Date Before Meeting - Top Romp
One year into the coronavirus pandemic, Katja Heimann, a mother of 11, is still trying to keep her spirits up — despite several lockdowns and months of homeschooling seven of her children. Authorities in Mexico's Yucatan peninsula have complained about tourists not wearing face masks, as Mexico braces for a surge of Easter Week visitors. Shows Good Morning America. World News Tonight. This Week.
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10 Reasons Why You Should Call Your Online Date Before Meeting
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