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- When Griffith injected mice with a combination of live rough-strain and heat-killed smooth-strain pneumococci, he discovered that (a) the mice were unharmed (b) the dead mice contained living rough-strain bacteria (c) the dead mice contained living smooth-strain bacteria (d) DNA had been transferred from the smooth-strain bacteria to the mice (e) DNA had been transferred from the rough-strain bacteria to the smooth-strain bacteriaIf DNA of a particular species was analyzed and it was found that it contains 27 percent A, what would be the percentage of C? 27 percent 30 percent 23 percent 54 percentThe results of a paternity test using short tandem repeats are listed in the table below. Whos the daddy? How sure are you?
- Which of the following statements about DNA is false? a. Phosphate is linked to the 5 and 3 carbons of adjacentdeoxyribose molecules. b. DNA is bidirectional in its synthesis. c. Each side of the helix is antiparallel to the other. d. The binding of adenine to thymine is through three hydrogenbonds. e. Avery identified DNA as the transforming factor in crossesbetween smooth and rough bacteria.2. What does the salt in the soapy salt solution do in the DNA extraction? a. It dissolves the DNA. b. It displaced a lot of proteins to free the DNA. c. It disrupts the phospholipid bilayer. d. It precipitates the DNA.1. How can you modify your DNA model to reflect changes among DNA molecules? 2. How can a DNA molecule make an exact copy of itself?
- 1. What are the considerations we need to consider in introducing recombinant DNA in plant calli and in animal cell lines? (Give at least three considerations) Explain and answer this comprehensively.1. Which of the following actions in the DNA extraction of strawberry separates the DNA from the rest of the solution? a. Addition of cold isopropyl alcohol b. crushing the strawberry c. Addition of soapy salt solution d. Filtration of the crushed strawberries 2. What does the salt in the soapy salt solution do in the DNA extraction? a. It dissolves the DNA. b. It displaced a lot of proteins to free the DNA. c. It disrupts the phospholipid bilayer. d. It precipitates the DNA.1. In his transformation experiments, what did Griffith observe? a. Mixing a heat-killed pathogenic strain of bacteria with a living nonpathogenic strain can convert some of the living cells into the pathogenic form b. Mixing a heat-killed nonpathogenic strain of bacteria with a living pathogenic strain makes the pathogenic strain nonpathogenic c. Mutant mice were resistant to bacterial infections. d. Infecting mice with nonpathogenic strains of bacteria makes them resistant to pathogenic strains
- 1. What is the purpose of adding of (a) warm salt water, (b) detergent, and (c) alcohol on the experiment of the extraction of DNA from a banana?1. If you will use apple or strawberries instead of banana do you think the result would be the same in the extraction of DNA from a banana? Why or why not?1. What is the principle behind the DNA extraction? 2. Describe the features isolated DNA of banana.