All of the following are TRUE of the structure of DNA EXCEPT: The nucleotides are held in a single strand by bonds between the phosphate group of 1 nucleotide and the #3 carbon of the next nucleotide. Each nucleotide is composed of a phosphate group, sugar ring, and nitrogen base There are 4 types of nucleotides based on how many phosphate groups are present in the molecule. Purines(A & G) are double ringed nitrogen bases while pyrimidines (C &T) have single ringed nitrogen bases. The parallel strands are held together by bonds between complimentary nitrogen bases. It is composed of 2 parallel strands of nucleotide subunits twisted into a helix. The structure of the complimentary bases is such that adenine binds with thymine and cytosine with guanine
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DNA consists of two long strands composed of nucleotides. There are four types of nucleotides: adenine, cytosine, guanine, and thymine. Each nucleotide is composed of a five-carbon sugar that is attached to a phosphate group and a nitrogen-containing base. In the case of the nucleotides in DNA, the sugar is attached to a single phosphate group, and the nitrogenous base may be either adenine, cytosine, guanine, or thymine. The nucleotides are linked together to form a strand through the sugars and phosphates, which thus form the backbone alternating sugar-phosphate groups. The three-dimensional structure of DNA arises from the chemical and structural features of its two polynucleotide chains. The two DNA strands are held together by bonding between the bases on the opposite strands, therefore forming a double helix, and the sugar-phosphate backbone runs along the outside.
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Which one of the following statements does NOT agree with Watson and Crick’s model for the 3-D structure of DNA? Group of answer choices A purine nucleotide is always paired with a purine nucleotide. DNA is a helical structure composed of two polynucleotide strands. The two polynucleotides strand are antiparallel to one another The two polynucleotide strands are held together by hydrogen bonds.
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All of the following are true of DNA EXCEPT: DNA is a double helix that consists of two antiparallel strands. DNA is a polymer of nucleotides. DNA has a sugar-phosphate backbone. DNA contains the nitrogenous bases adenine, guanine, thymine, and cytosine. The two strands of double-stranded DNA are held together by hydrogen bonds.
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