DNA Structure and DNA Replication

Master DNA structure and replication with our detailed worksheet!

What is X? Deoxyribose Sugar Phosphate Nitrogen Bases Nucleotide True or False: Cytosine, guanine, thymine and adenine are referred to as phosphates. True False True or False: A nucleotide is made up a sugar, phosphate and two nitrogen bases. True False True or False: Adenine always pairs with Thymine. True False True or False: The backbones (outside) of DNA molecules are made up of repeating nitrogen bases and sugars. True False True or False: Replication results in two strands of DNA, each of which has halfthe original strand. True False True or False: Hydrogen bonds hold nitrogen bases together, forming the rings of the DNA ladder. True False Put the steps of DNA replication in order. 5th Step Two new molecules of DNA are created3rd Step DNA polymerase attaches the free-floating nucleotides to exposed nitrogen bases.1st Step Helicase begins to break the hydrogen bonds between nitrogen bases.4th Step DNA ligase glues together the gaps in the DNA2nd Step Primase adds a primer to the DNA. Complete the sentences. a) DNA replication occurs in the nucleus.b) Adenine, guanine, cytosine and thymine are the four nitrogen bases.c) In DNA, cytosine always forms hydrogen bonds with guanine.d) The sequence of DNA's nitrogen bases carries the genetic information of an organism.e) The process of replication produces a new copy of an organism's genetic information.f) The double coiled shape of DNA is called a double helix.g) In DNA, thymine always goes with adenine.h) DNA is considered semi-conservative because it contains one old strand and one new strand. Match the enzyme with the correct function. Helicase Unwinds the DNA by breaking hydrogen bonds DNA Polymerase Adds new new nucleotides to both template strands and proofreads them DNA Ligase Glues the new bases to the old bases in DNA template Given the original strand of DNA, create the new strand of DNA. Write in capital letters, for example Thymine = T A T C G T A T A A T C G G C C G C G G C A T T A Which enzyme is this? Helicase DNA Polymerase DNA Ligase What enzymes is this? Helicase DNA Polymerase DNA Ligase What is Y???? Deoxyribose Sugar Phosphate Thymine Adenine Guanine Would YOU choose to add a trait to your child if the techniques were 100% safe? Why or why not? What trait might you add or what scares you about the technology?