LIFE SCIENCE

Detailed explanation-1: -The percentage of guanine is 20%. A = T, G =C.

Detailed explanation-2: -Solution. If 30 percent of an organism’s DNA is thymine, then 20 percent is guanine. Because thymine and adenine are bonded together, their numbers are equal. The sum of cytosine and guanine is also the same.

Detailed explanation-3: -Answer and Explanation: A double-stranded DNA molecule with 20% thymine would contain 30% guanine.

Detailed explanation-4: -Answer and Explanation: Based on the nucleotide pairs that form in our DNA, the number of guanines is always equal to the number of cytosines, and the number of adenines is always equal to the number of thymines. If a DNA sample is made up of 30% guanine, then it must contain an equal amount (30%) of cytosine (C).

Detailed explanation-5: -Thymine is present in RNA but not in DNA. The purines of DNA are represented by guanine and thymine. Thymine and cytosine are types of bases of DNA. In a typical DNA molecule the proportion of thymine is 30% of the N bases.