AP BIOLOGY

THE MOLECULAR BASIS OF INHERITANCE

DNA MAKES RNA MAKES PROTEIN

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
If A % of DNA is 30 and G % is 20. What is the % of thymine?
A
25
B
20
C
32
D
30
Explanation: 

Detailed explanation-1: -Therefore, the answer is T = 30%, A = 30%, G = 20% and C = 20%.

Detailed explanation-2: -So, for this DNA sequence, C + G = 60%. The remaining 40% of the sequence must consist of A-T pairs (adenine-thymine). Therefore, 20% of the sequence is made up of adenine, and 20% of the sequence is made up of thymine.

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

Detailed explanation-4: -In a DNA sample, the percentage of adenine is 40% and percentage of thymine is 60%. What is your inference? According to Chargaff’s rule, Concentration of adenine=concentration of thymine. therefore if [A]=40% then the [T] will also be 40%.

Detailed explanation-5: -Thymine – 30%, Guanine – 20%, Cytosine – 20%. Chargaff’s nitrogen base pairing rule which states that amount of adenine is equal to thymine and guanine is equal to cytosine.

There is 1 question to complete.