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In a DNA percentage of thymine is 20% then what will be the percentage of guanine?
[2002]
- a)20%
- b)40%
- c)30%
- d)60%
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
In a DNA percentage of thymine is 20% then what will be the percentage...
According to Chargaff's rule, the ratio of purine bases to pyrimidine bases is equal.
A = T, C = G.
If T is 20% then A is 20% and C and G are 30%, 30%.
A = T, C = G.
If T is 20% then A is 20% and C and G are 30%, 30%.
Most Upvoted Answer
In a DNA percentage of thymine is 20% then what will be the percentage...
According to Chargaffs rules ..the ratio of purine bases to pyramidine bases is equal..that is..adenine=thymine guanine = cytosine..given thymine = 20% from this we can say that adenine is also 20% ..then cytosine and guanine combined percentage will be 60% which means cytosine=30% and guanine=30%..therefore percentage of guanine is 30% option C
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In a DNA percentage of thymine is 20% then what will be the percentage...
DNA is made up of four nitrogenous bases- Adenine (A), Thymine (T), Guanine (G) and Cytosine (C). The percentage of each base in DNA adds up to 100%.
Given that the percentage of thymine is 20%, we can use Chargaff's rule to determine the percentage of guanine. According to Chargaff's rule, the amount of adenine is equal to the amount of thymine, and the amount of guanine is equal to the amount of cytosine.
Therefore, if the percentage of thymine is 20%, the percentage of adenine is also 20%. This adds up to 40% for the total percentage of adenine and thymine.
Since the total percentage of DNA is 100%, we can subtract the percentage of adenine and thymine from 100% to get the percentage of guanine and cytosine.
100% - 40% = 60%
Therefore, the percentage of guanine is 60%.
Answer: c) 30%
Given that the percentage of thymine is 20%, we can use Chargaff's rule to determine the percentage of guanine. According to Chargaff's rule, the amount of adenine is equal to the amount of thymine, and the amount of guanine is equal to the amount of cytosine.
Therefore, if the percentage of thymine is 20%, the percentage of adenine is also 20%. This adds up to 40% for the total percentage of adenine and thymine.
Since the total percentage of DNA is 100%, we can subtract the percentage of adenine and thymine from 100% to get the percentage of guanine and cytosine.
100% - 40% = 60%
Therefore, the percentage of guanine is 60%.
Answer: c) 30%
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