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  • . . . DNA Structure Activity Problem 2: Is DNA a right- or left-handed helix? Examine the view labeled "2 separate DNA strands".
  • In what direction do the DNA strands spiral away from you around the helix axis? A. both clockwise. DNA is a right-handed helix. B. both counter-clockwise. DNA is a left-handed helix. C. one strand clockwise, and one strand counter-clockwise
  • . . . Puzzles Quizzes PowerPoints Glossary SITE MAP Video Watch Download Stock Video SITE MAP Integration of Viral DNA Once the viral RNA has been reverse-transcribed into a strand of DNA, the DNA can then be integrated (inserted) into the DNA of the lymphocyte.
  • . . . Stock Video SITE MAP Integration of Viral DNA Once the viral RNA has been reverse-transcribed into a strand of DNA, the DNA can then be integrated (inserted) into the DNA of the lymphocyte. The virus has its own enzyme called "integrase" that facilitates incorporation of the viral DNA into the host cells DNA
  • . . . DNA Structure Activity Problem 2: Is DNA a right- or left-handed helix? Examine the view labeled "2 separate DNA strands".
  • In what direction do the DNA strands spiral away from you around the helix axis? Tutorial A picture of one strand of DNA , showing only the sugar-phosphate backbone, with the bases hidden, is shown to emphasize the helical spiral of the polymer
  • . . . DNA Structure Activity If you haven't already done so, open the file named "DNA .mcm" with either MacMolecule2 (MacOS) or PCMolecule2 (Windows) molecular visualization software (If need be return to the Introduction for instructions).
  • For each question, you will be directed to a special view of DNA for use in answering the question. Good luck! Identifying the location of phosphate groups. Is DNA a right- or left-handed helix? Grooves in the DNA double helix. The deoxyribose sugar ring
  • . . . DNA Structure Activity Introduction This exercise is designed to accompany an introduction to DNA structure from an introductory biology class.
  • Views of DNA Structure This exercise is based on different views of DNA structure, and an accompanying explanation of each view. After reviewing the view, you are presented with a question to test your understanding
  • . . . DNA Structure Activity Problem 6: Location of the sugar in the DNA double helix Switch to the view of DNA labeled "Sugar location." In this view, the carbon atoms of the sugars are colored green to emphasize their location.
  • . . . The " " zoom tool from the Toolbar can be used for a closer look at the position of individual sugar rings in the DNA structure. Are the deoxyribose sugars, and the phosphates that link them together, located: A. stacked atop each other in the middle of the DNA helix. B. on the outside surface, interspersed with phosphate groups
  • . . . DNA Structure Activity Problem 6: Location of the sugar in the DNA double helix Correct! Switch to the view of DNA labeled "Sugar location." In this view, the carbon atoms of the sugars are colored green to emphasize their location.
  • . . . The " " zoom tool from the Toolbar can be used for a closer look at the position of individual sugar rings in the DNA structure. Are the deoxyribose sugars, and the phosphates that link them together, located: A. stacked atop each other in the middle of the DNA helix. B. on the outside surface, interspersed with phosphate groups
  • . . . DNA Structure Activity Problem 6: Location of the sugar in the DNA double helix Switch to the view of DNA labeled "Sugar location." In this view, the carbon atoms of the sugars are colored green to emphasize their location.
  • . . . The " " zoom tool from the Toolbar can be used for a closer look at the position of individual sugar rings in the DNA structure. Are the deoxyribose sugars, and the phosphates that link them together, located: Tutorial The alternating sugar-phosphate repeat forms the backbone of each DNA strand
  • . . . DNA Structure Activity Problem 3: Grooves in the DNA double helix Examine the view labeled "phosphate group location".
  • . . . Proteins that interact with DNA often make contact in these grooves. How would you describe the grooves in the DNA surface? Tutorial The sugar-phosphate backbones spiral around the outer surface of DNA . Between these backbones are two different sized grooves, designated the major and minor grooves
  • . . . DNA Structure Activity Problem 7: Are the two strands of DNA parallel or anti-parallel? Are the two strands of DNA parallel or anti-parallel? Switch to the view labeled "Antiparallel DNA strands".
  • . . . Bar can be used for zooming in and out.Using the red oxygen atoms as a reference, determine if the two strands of DNA spiral in the: Tutorial The close up picture from the view "Antiparallel DNA strands" was created with the zoom tool. Try zooming in close for a better look
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  • ty. Abrogation of two from among of the three C/EBP DNA-binding motifs of the promoter revealed that C/EBPα acts in cis but C/EBPβ in trans .
  • . . . through epigenetic mechanisms, since the SCD1 activity was found to correlate with the degree of CpG island DNA-methylation at the promoters of relevant immune genes [ 23 ]. Hormonal and nutrient factors are known to regulate SCD1 expression in several species including man and mouse [ 24 , 25 ]
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