If you do not have an SSN and are not eligible to obtain an SSN, but you have a requirement to furnish a federal tax identification number or file a federal income tax return, you must apply for an ITIN. By law, an alien individual cannot have both an ITIN and an SSN.
DNA bases pair up with each other, A with T and C with G, to form units called base pairs. Each base is also attached to a sugar molecule and a phosphate molecule. Together, a base, sugar, and phosphate are called a nucleotide. Nucleotides are arranged in two long strands that form a spiral called a double helix.
Merge this question into. Split and merge into it. Answer by 1Jazz. Confidence votes 9.4K. The sugar-phosphate backbone of DNA is held together by covalent bonds. The strands of DNA are joined by hydrogen bonds (H-bonds) between the nitrogenous bases on either side. Adenine is joined to Thymine by 2 H-bonds.erge this question into. Split and merge into it. Answer by 1Jazz. Confidence votes 9.4K. The sugar-phosphate backbone of DNA is held together by covalent bonds. The strands of DNA are joined by hydrogen bonds (H-bonds) between the nitrogenous bases on either side. Adenine is joined to Thymine by 2 H-bonds.