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Table 1 shows the molar properties of bases in the nucleic acid from nine different living organisms. Nucleic acid Percentage (%) A+T G+C Adenine Thymine Cytosine Guanine 24.9 Escherichia coli 26.0 23.9 25.2 1.00 (K-12) Diplococcus 29.8 31.6 20.5 18.0 1.59 pneumonia Mycobacterium 15.1 14.6 34.9 35.4 0.42 tuberculosis Yeast 31.3 32.9 18.7 17.1 1.79 Paracentrotus 32.8 32.1 17.7 18.4 1.80 lividus Herring 27.8 27.5 22.2 22.6 1.23 28.6 28.4 21.4 21.5 1.33 Rat Human Species X 30.7 31.2 19.3 18.8 1.62 30.9 29.4 ? ? ? (i) What are the percentages of Guanine and Cytosine in Species X? (ii) Which organism has a higher melting point for its DNA structure compared to species X?

Table 1 shows the molar properties of bases in the nucleic acid from nine different living organisms. Nucleic acid Percentage (%) A+T G+C Adenine Thymine Cytosine Guanine 24.9 Escherichia coli 26.0 23.9 25.2 1.00 (K-12) Diplococcus 29.8 31.6 20.5 18.0 1.59 pneumonia Mycobacterium 15.1 14.6 34.9 35.4 0.42 tuberculosis Yeast 31.3 32.9 18.7 17.1 1.79 Paracentrotus 32.8 32.1 17.7 18.4 1.80 lividus Herring 27.8 27.5 22.2 22.6 1.23 28.6 28.4 21.4 21.5 1.33 Rat Human Species X 30.7 31.2 19.3 18.8 1.62 30.9 29.4 ? ? ? (i) What are the percentages of Guanine and Cytosine in Species X? (ii) Which organism has a higher melting point for its DNA structure compared to species X?

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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Table 1 shows the molar properties of bases in the nucleic acid from nine different living organisms. Nucleic acid Percentage (%) A+T G+C Adenine Thymine Guanine Cytosine Escherichia coli 26.0 23.9 24.9 25.2 1.00 (K-12) Diplococcus 29.8 31.6 20.5 18.0 1.59 pneumonia Mycobacterium 15.1 14.6 34.9 35.4 0.42 tuberculosis Yeast 31.3 32.9 18.7 17.1 1.79 Paracentrotus 32.8 32.1 17.7 18.4 1.80 lividus Herring 27.8 27.5 22.2 22.6 1.23 Rat 28.6 28.4 21.4 21.5 1.33 Human 30.7 31.2 19.3 18.8 1.62 Species X 30.9 29.4 ? ? ? (i) What are the percentages of Guanine and Cytosine in Species X? (ii) Which organism has a higher melting point for its DNA structure compared to species X? Explain why DNA in the presence of monovalent cations will have a high melting temperature (Tm). (iv) Erwin Chargaff's research was based on the selection of DNAs from many organisms (Table 1). If Erwin's analyses is based on only the data of Escherichia coli (K12), would he be able to establish certain Chargaff's rule? Explain.
Transcribed Image Text:Table 1 shows the molar properties of bases in the nucleic acid from nine different living organisms. Nucleic acid Percentage (%) A+T G+C Adenine Thymine Guanine Cytosine Escherichia coli 26.0 23.9 24.9 25.2 1.00 (K-12) Diplococcus 29.8 31.6 20.5 18.0 1.59 pneumonia Mycobacterium 15.1 14.6 34.9 35.4 0.42 tuberculosis Yeast 31.3 32.9 18.7 17.1 1.79 Paracentrotus 32.8 32.1 17.7 18.4 1.80 lividus Herring 27.8 27.5 22.2 22.6 1.23 Rat 28.6 28.4 21.4 21.5 1.33 Human 30.7 31.2 19.3 18.8 1.62 Species X 30.9 29.4 ? ? ? (i) What are the percentages of Guanine and Cytosine in Species X? (ii) Which organism has a higher melting point for its DNA structure compared to species X? Explain why DNA in the presence of monovalent cations will have a high melting temperature (Tm). (iv) Erwin Chargaff's research was based on the selection of DNAs from many organisms (Table 1). If Erwin's analyses is based on only the data of Escherichia coli (K12), would he be able to establish certain Chargaff's rule? Explain.
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