BIOMOLECULES AND ENZYMES

BIOLOGY

STRUCTURE OF PROTEINS

 Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Katie is analyzing a particular DNA strand that’s composition is 20% adenine. Which of the following represents the percent thymine?
 A 20% B 30% C 40% D 60%
Explanation:

Detailed explanation-1: -Since adenine is 20%, then thymine is 20% as well. The total of both is 40%.

Detailed explanation-2: -Answer and Explanation: A double-stranded DNA molecule with 20% thymine would contain 30% guanine.

Detailed explanation-3: -Updated On: 27-06-2022 Thus, If a double stranded DNA has 20% of cytosine, it has 20% of guanine. Thus, cytosine plus guanine make 40% of the total bases. The remaining 60% includes both adenine and thymine which are in equal amounts. Therefore, the percent of adenine is 30%.

Detailed explanation-4: -Answer and Explanation: If a cell contains 20% guanine, it will contain 30% adenine. According to Chargaff’s rules, %G = %C and %A = %T. The bases G and C are complementary and are always equal in amount in double-stranded DNA.

Detailed explanation-5: -If 20% of the DNA in a guinea pig cell is adenine, what percentage is cytosine? Explain your answer. If 20% is adenine, then 20% is thymine. The remaining 60% is composed of cytosine and guanine in equal percentages so that each makes up 30% of the DNA.

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