You measure the content of 5 tRNA's constructed in the protein synthesis process. You find that there are: A 40% G 27% C 13% T 0% U 20% What was the percent composition of nucleotides in the corresponding template strand of original DNA?
a) A 60% G27% C 13% T 0% U 0%
b) A 40% G 27% C13% T 0% U 20%
c) A 20% G13% C 27% T 40% U 0%
d) A 20% G13% C 27% T 0% U 40%
e) A 40% G 27% C 13% T 20% U 0%
To find the percent composition of nucleotides in the corresponding template strand of the original DNA, we need to use the complementary base pairing rules.
The complementary base pairings are as follows:
- Adenine (A) pairs with Thymine (T)
- Guanine (G) pairs with Cytosine (C)
- Uracil (U) pairs with Adenine (A), but in DNA, Thymine (T) is present instead of Uracil (U).
Given the percentages of nucleotides in the tRNA, we can determine the composition of the template strand of the original DNA as follows:
A 40%
G 27%
C 13%
T 0%
U 20%
Since tRNA contains Uracil (U) instead of Thymine (T), we can assume that the original DNA strand also contains Thymine (T) instead of Uracil (U).
Therefore, the corresponding composition of nucleotides in the template strand of the original DNA is:
A 40%
G 27%
C 13%
T 20%
U 0%
So the correct answer is:
e) A 40% G 27% C 13% T 20% U 0%