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Question
If 30 percent of an organism’s DNA is thymine, then ______.
Options
40 percent adenine
30 percent is cytosine
30 percent is guanine
20 percent is guanine
MCQ
Fill in the Blanks
Solution
If 30 percent of an organism’s DNA is thymine, then 20 percent is guanine.
Explanation:-
Because thymine and adenine are bonded together, their numbers are equal. The sum of cytosine and guanine is also the same. The cytosine and guanine percentages are 100 - 60 = 40%. So, percentage of guanine is `40/2`= 20%.
shaalaa.com
Deoxyribonucleic Acid (DNA) and Its Structure - Structure of Polynucleotide Chain
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