helping determine the structure of DNA. The percentages of adenine (A), cytosine (C), guanine (G) and thymine (T) bases in DNA from three species are shown below. Select the best answer for each of the questions. Q1: Does the distribution of nucleotide bases in species 1 and 2 in the table follow Chargaff’s rules? Why or why not? Q2: Based on the information in the table, what is the % cytosine in species 3?

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In 1950, Edwin Chargaff discovered that the ratios of A:T bases, and of G:C bases, in DNA is always 1:1. This discovery became known as Chargaff's rules and was important in helping determine the structure of DNA. The percentages of adenine (A), cytosine (C), guanine (G) and thymine (T) bases in DNA from three species are shown below. Select the best answer for each of the questions.

Q1: Does the distribution of nucleotide bases in species 1 and 2 in the table follow Chargaff’s rules? Why or why not?

Q2: Based on the information in the table, what is the % cytosine in species 3?

In 1950, Edwin Chargaff discovered that the ratios of A:T bases, and of G:C bases, in DNA is always 1:1. This discovery
became known as Chargaff's rules and was important in helping determine the structure of DNA. The percentages of
adenine (A), cytosine (C), guanine (G) and thymine (T) bases in DNA from three species are shown below. Select the best
answer for each of the questions.
Source of
DNA
Adenine
Cytosine
Guanine
Thymine
Species 1
32.8%
17.7%
17.3%
32.1%
Species 2
29.7%
20.8%
20.4%
29.1%
Species 3
28.1%
22.2%
27.9%
Transcribed Image Text:In 1950, Edwin Chargaff discovered that the ratios of A:T bases, and of G:C bases, in DNA is always 1:1. This discovery became known as Chargaff's rules and was important in helping determine the structure of DNA. The percentages of adenine (A), cytosine (C), guanine (G) and thymine (T) bases in DNA from three species are shown below. Select the best answer for each of the questions. Source of DNA Adenine Cytosine Guanine Thymine Species 1 32.8% 17.7% 17.3% 32.1% Species 2 29.7% 20.8% 20.4% 29.1% Species 3 28.1% 22.2% 27.9%
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