Introduction to Plant Genetics
Introduction to Plant Genetics CSS 350
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This 3 page Class Notes was uploaded by Rosalind O'Connell on Saturday September 19, 2015. The Class Notes belongs to CSS 350 at Michigan State University taught by Janet Lewis in Fall. Since its upload, it has received 83 views. For similar materials see /class/207205/css-350-michigan-state-university in Soil Science at Michigan State University.
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Date Created: 09/19/15
Christopher Wayne A38331593 Section 2 CSS 350 Homework 1 1 Use a diagram to indicate base paring that occurs between nucleotides of a double J 1 DNA using the following semlence as one ofthe two strands 10 points 5 GT 3 Show the following in your diagram a Include the three components of each of the nucleotides and how they are attached ie indicate where the nitrogenous base phosphate group pentose sugars are attached 3 points 7 Label the 5 and 3 ends for both the DNA strands pay careful attention to this 1 point c Indicate the carbons in the pentose sugars ie 1 2 etc 1 point D Phosphodiester bonds 1 point e Hydrogen bonds make sure you have the correct number of them 2 points f The antiparallel nature of the two strands using arrows Explain how you determined the answer 2 points See attached page 2 Describe how the structures of DNA and RNA differ and thus their names differ 1 point Ribonucleic acid is a nucleic acid polymer consisting of nucleotide monomers RNA nucleotides contain ribose rings and uracil unlike deoxyribonucleic acid DNAwhich contains deoxyribose and thymine It is transcribed synthesized from DNA by enzymes called RNA polymerases and further processed by other enzymes RNA serves as the template for translation of genes into proteins transferring amino acids to the ribosome to form proteins and also translating the transcript into proteins Unlike DNA RNA is almost always a single stranded molecule and has a much shorter chain of nucleotides RNA contains ribose rather than the deoxyribose found in DNA there is a hydroxyl group attached to the pentose ring in the 239 position whereas RNA has two hydroxyl groups These hydroxyl groups make RNA less stable than DNA because it is more prone to hydrolysis Several types of RNA tRNA rRNA contain a great deal of secondary structure which help promote stability Christopher Wayne A38331593 3 DNA is packaged so that very long DNA molecules can be stored in a microscopic nucleus in the cell Explain the Various levels of DNA packaging you may use a diagram 7 4 points c At the smallest level the nucleotides are organized in linear strands as double helices As one looks away the DNA strand is wrapped around histones a form of DNA wrapped around a histone molecule is a nucleosome These nucleosomes form chromatin bers N udeosome ore DNA Zrnm diameter d Melaphase chromosome Spacer DNA plus H1 histune a Nucleosomu 6mm x l39lnm Hal dug Section 2 shun region ol DNA doubly hallx u 3 39 3939 lt l boads owluriug II nm lmm a chrmmran l 30 nm chromlm quotbe or Dialed uuclmsorms union of chvomosomo in an ammdod lorm condorsod socmn cl menphase luomnwm39 m l mtllphusn H00 nm chromosome Chromatld c Chromatin zoomu diameter Luoped domains mo rm diameter fiber Hixlone octamer plus 147 base pairs of DNA Christopher Wayne A38331593 Section 2 4 Mitosis is important for plants Please answer the following questions 1 Give an example of mitosis taking place in a plant cell 1 point 1 An example might be when a plant is wounded and it undergoes mitosis to heal itself b Draw Use a diagram to show the process of mitosis Be sure to label each phase 8 points Growth and preparation for mitosis
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