Given the findings of biochemist Erwin Chargaff about the composition of DNA. Answer the following questions: (1)     What is your general observation on their findings? (2)    Why are the proportions of the nitrogen bases of human thymus and human sperm almost the same?

Biochemistry
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ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
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Chapter1: Biochemistry: An Evolving Science
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 Given the findings of biochemist Erwin Chargaff about the composition of DNA. Answer the following questions:

(1)     What is your general observation on their findings?

(2)    Why are the proportions of the nitrogen bases of human thymus and human sperm almost the same?

Table 1. Proportions of nitrogenous bases in the DNA of different organisms. Data from Chargaff and Davidson (1955).
% Thymine
Organism
Yeast
Sea urchin
Tissue
% Adenine
% Guanine
% Cytosine
31.3
18.7
17.1
32.9
Sperm
32.8
17.7
18.4
32.1
Rat
Bone marrow
28.6
21.4
21.5
28.4
Thymus
Sperm
Human
30.9
19.9
19.8
29.4
Human
30.3
19.5
19.9
30.3
Transcribed Image Text:Table 1. Proportions of nitrogenous bases in the DNA of different organisms. Data from Chargaff and Davidson (1955). % Thymine Organism Yeast Sea urchin Tissue % Adenine % Guanine % Cytosine 31.3 18.7 17.1 32.9 Sperm 32.8 17.7 18.4 32.1 Rat Bone marrow 28.6 21.4 21.5 28.4 Thymus Sperm Human 30.9 19.9 19.8 29.4 Human 30.3 19.5 19.9 30.3
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