What are the roles of covalent bonds and hydrogen bonds in the structure of dna?

For the answer to the question above,
 DNA is made up of two nucleotide strands. The nucleotides are connected together by covalent bonds within each strand. The sugar of one nucleotide forms a covalent bond with the phosphate group of another. The two strands themselves are connected by hydrogen bonds. The hydrogen bonds are found between the bases of the two strands of nucleotides. Adenine forms hydrogen bonds with thymine whereas guanine forms hydrogen bonds with cytosine. This is called complementary base pairing

Hydrogen bonds is holding together the two strands of nucleic 
Covalent bonds hold the atoms and molecules together in each of the amino acid chains. Two complimentary chains are held together by hydrogen bonds to form a double-helix.

The covalent bonds and hydrogen bonds in the structure of DNA are because covalent bond holds together sugar and bases. The hydrogen bond holds together the two nucleotides. They provide stability in structure of DNA

Further Explanation:

DNA is mainly made up of the nucleotides and also contains genetic information in the genes. Every nucleotide is made up of deoxyribose, nitrogenous base, and phosphate group. DNA is composed of four distinct type of nitrogenous base: cytosine, adenine, guanine, and thymine. The DNA consist two kind of chemical bones in their structure:

Covalent bond Hydrogen bond

The nucleotides present in DNA are linked with the corresponding base through hydrogen bonds only. The stability of DNA is due to the presence of covalent bond because these are the strongest bond. Covalent bonds connect the sugar, phosphate group and bases.

The hydrogen bonds mainly present in water, DNA and protein

The cytosine pairs with guanine with three hydrogen bonds. On the other hand the thymine pairs with adenine with two hydrogen bonds.  

Learn more:

Learn more about mitosis Learn more about the menstrual cycle Learn more about meiosis

Answer Details:

Grade: High School

Subject: Molecular Biology

Chapter: Gene expression

Keywords:

DNA, RNA, guanine, adenine, cytosine, gene, chromosome, genetic information, nucleosome, thymine, nucleotide, hydrogen bond, covalent bond.