Question

You are studying the genomes of deep sea organisms when you come across a brand new species of lantern fish. In the lab, you measure the percent of nucleotides in the nucleus that contain adenine as their base and that percent is 30%. 10. Calculate the percent of thymine nucleotides: _______________ 11. Calculate the percent of guanine nucleotides: _______________ 12. Calculate the percent of cytosine nucleotides: _______________

Answer 1

Answer:

Thymine = 30%

Guanine = 20%

Cytosine = 20%

Explanation:

DNA is a double-stranded molecule made up of long chains of nucleotides (A, T, G, C). Each chain is the strand. However, According to Chargaff, the amount of adenine in a DNA is equal to the amount of thymine while the amount of guanine equals the amount of cytosine. That is:

(A = T) + (G = C) = 100%

All together, they all make up 100%. According to this question, the percent of nucleotides in the nucleus was measured to contain adenine as their base which is 30%.

If Adenine is 30%,. Then Thymine is 30% as well.

A = T = 30+30 = 60%

Hence,

60% + G + C = 100%.

G + C = 100 - 60

G + C = 40%

Since, G = C, 40/2 = 20%. Hence, G = 20% while C = 20%

All together,

A = 30%

T = 30%

G = 20%

C = 20%