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Section 11.1 mp

Chapter 11 test

QuestionAnswer
Analyze the structure of DNA The simple sugar in DNA is deoxyribose, the phosphate group is composed of one atom of phosphorus surrounded by four oxygen atoms. There are four nitrogenous bases: adenine, guanine, cytosine, and thymine
How DNA duplicate itself accurately: Step One in Replication Separation of Strands: When a cell begins to copy its DNA, the two nucleotide strands of a DNA molecule separate when the hydrogen bonds connecting the base pairs are broken. As the DNA molecule unzips, the bases are exposed.
Step Two in Replication Base pairing: The bases in free nucleotides pair with exposed bases in the DNA strand. Each strand builds its complement by base pairing-forming hydrogen bonds-with free nucleotides.
Step Three in Replication Bonding of bases: The sugar and phosphate parts of adjacent nucleotides bond together with covalent bonds to form the backbone of the new strand. Each original strand is now hydrogen-bonded to a new strand.
Step Four in Replication Results of replication: The process of replication produces two molecules of DNA. Each new molecule has one strand from the original molecule and one strand that has been newly synthesized from free nucleotides in the cell.
Created by: mpiontek
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