TABLE 7-1 Molar Properties of Bases* in DNAS from Various Sources A +T Organism Tissue Adenine Thymine Guanine Cytosine G+C Escherichia coli (K12) Diplococcus pneumoniae Mycobacterium tuberculosis 26.0 23.9 24.9 25.2 1.00 29.8 31.6 20.5 18.0 1.59 15.1 14.6 34.9 35.4 0.42 Yeast 31.3 32.9 18.7 17.1 1.79 Paracentrotus lividus Sperm 32.8 32.1 177 18.4 1.85 (sea urchin) Herring 1.23 1.33 Sperm 27.8 275 22.2 22.6 Rat Bone marrow 28.6 28.4 21.4 21.5 Human 19.9 19.8 Thymus Liver 30.9 29.4 1.52 Human 30.3 30.3 19.5 19.9 1.53 Human Sperm 30.7 31.2 19.3 18.8 1.62 *Defined as moles of nitrogenous constituents per 100 g-atoms phosphate in hydrolysate. Source: Data from E Chargaff and J. Davidson, eds, The Nucleic Acids. Academic Press, 1955.

Human Anatomy & Physiology (11th Edition)
11th Edition
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Author:Elaine N. Marieb, Katja N. Hoehn
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Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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In Table 7-1, why are there no entries for the first four
tissue sources? For the last three entries, what is the most
likely explanation for the slight differences in the composition of human DNA from the three tissue sources?

TABLE 7-1 Molar Properties of Bases* in DNAS from Various Sources
A +T
Organism
Tissue
Adenine
Thymine
Guanine
Cytosine
G+C
Escherichia coli (K12)
Diplococcus pneumoniae
Mycobacterium tuberculosis
26.0
23.9
24.9
25.2
1.00
29.8
31.6
20.5
18.0
1.59
15.1
14.6
34.9
35.4
0.42
Yeast
31.3
32.9
18.7
17.1
1.79
Paracentrotus lividus
Sperm
32.8
32.1
177
18.4
1.85
(sea urchin)
Herring
1.23
1.33
Sperm
27.8
275
22.2
22.6
Rat
Bone marrow
28.6
28.4
21.4
21.5
Human
19.9
19.8
Thymus
Liver
30.9
29.4
1.52
Human
30.3
30.3
19.5
19.9
1.53
Human
Sperm
30.7
31.2
19.3
18.8
1.62
*Defined as moles of nitrogenous constituents per 100 g-atoms phosphate in hydrolysate.
Source: Data from E Chargaff and J. Davidson, eds, The Nucleic Acids. Academic Press, 1955.
Transcribed Image Text:TABLE 7-1 Molar Properties of Bases* in DNAS from Various Sources A +T Organism Tissue Adenine Thymine Guanine Cytosine G+C Escherichia coli (K12) Diplococcus pneumoniae Mycobacterium tuberculosis 26.0 23.9 24.9 25.2 1.00 29.8 31.6 20.5 18.0 1.59 15.1 14.6 34.9 35.4 0.42 Yeast 31.3 32.9 18.7 17.1 1.79 Paracentrotus lividus Sperm 32.8 32.1 177 18.4 1.85 (sea urchin) Herring 1.23 1.33 Sperm 27.8 275 22.2 22.6 Rat Bone marrow 28.6 28.4 21.4 21.5 Human 19.9 19.8 Thymus Liver 30.9 29.4 1.52 Human 30.3 30.3 19.5 19.9 1.53 Human Sperm 30.7 31.2 19.3 18.8 1.62 *Defined as moles of nitrogenous constituents per 100 g-atoms phosphate in hydrolysate. Source: Data from E Chargaff and J. Davidson, eds, The Nucleic Acids. Academic Press, 1955.
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