....o T-Mobile Wi-Fi 12:48 PM 91% bsuonline.blackboard.com Biology 102 Chapter 1
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....o T-Mobile Wi-Fi 12:48 PM 91% bsuonline.blackboard.com Biology 102 Chapter 12 Practice Qs hoose corrent answer Before 1940s scientists believed that proteins rather than DNA- were the camers of genetic material in the cell. Why? Proteins ar present within the nucleus c Twenty different amino acids could produce a large number of unique combinations. d Proteins are able to self replicate Proteins are routinely exponed from the eell. In the esperimentserGrimit the conversion ofnonlethal Rstrain bacteria lethal S strain baaneria b, was due to proved that proteins are the genetic material a was due to genetic could not be reproduced by other nesearchers similar experiment performed by Watson and Crick The first scientists to use Griffith's transformation assay to identify genetic material were: Meselson & Stahl b, Watson &Crick; c Franklin & Wilkins d wery, MacLeod, and MeCarty. Hershey and Chase. The bacteriophages used in Alfred Hersheysand Martha Chase'sexperiments showed that a DNA was injected into bacteria b DNA and protein were injected into bateria e DNA remained eouler coat of bacteria d proteins were injected into bacteria proteins were responsible for the production of new viruses within the bacteria compased of 20 nucleotides. is capable of assuming a wide variety o ts sugars and phosphates an be amanged in many different sequences. re 12-1 The chemical group in box Sof figure 12-1 above is hydrogen bond The chemical group boa the accompanying figure is b, purine d amino acide covalent bond Hydrogen bonds can form between guanine and thymine cytorine cytowine thymine d. sugar phosphate adenine panine In order to the Xray crystallegraphic data, the twe DNA strands must be to each other. 0. Which of the following nuclcotide sequences represents the complement to the DNAstrand 5 bends link the sugar and phosphate groupsinthe backbones of DNA melecules d. Ionic e. Weak covalent ofA-T base pairs is always equal to the number of GC base pairs in all DNA DNA molecule is always equal the adenine content in ONA molecule is ater than the he puanine content in any DNAmolecule relationship between the ratio of purine and pyrimidine content in any DNA molecule. of nucleotide building blocks b contains pyrimidines and purines in a 2:1 ratio contains the sugarribose contains uracil instead thymine Chargaf determined that DNA front anysource contains about the same amount of guanine b, thymine cytosineExplanation / Answer
1. Before Griffth's experiment which proved DNA and not protein as the genetic material, it was believed by the biologists that protein molecules are genetic material and not DNA, because 20 different amino acids are involved to form different protein molecules. However, there are only 4 nucleotide bases which forms a DNA molecule.
So, correct option is C
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