Question

The nucleotide sequence of one of the DNA strands is

Hint:

In double stranded DNA, GC percentage can be calculated directly from one strand because the complementary strand contributes matching \(G\) and \(C\) bases.

Answer 1

Correct Answer: 55.56

Step 1: Recall the definition of GC content.
GC content represents the percentage of nitrogenous bases that are either guanine (\(G\)) or cytosine (\(C\)) in DNA.
\[ \text{GC content}= \frac{\text{Number of G and C bases}}{\text{Total number of bases}} \times 100 \]

Step 2: Write the given DNA sequence.
GCTGTAACGATAGCACGC

Step 3: Count the total number of nucleotides.
The sequence contains
\[ 18 \] nucleotides.

Step 4: Count the number of G and C bases.
Sequence:
G C T G T A A C G A T A G C A C G C Number of \(G\) bases \(=5\)
Number of \(C\) bases \(=5\)
Thus, total GC bases are
\[ 5+5=10 \]

Step 5: Calculate GC percentage.
\[ \text{GC content} = \frac{10}{18}\times 100 \]
\[ =55.555\ldots \]

Step 6: Round off to two decimal places.
\[ 55.555\ldots \approx 55.56\% \]

Step 7: Final conclusion.
Therefore, the GC content of the double stranded DNA is
\[ \boxed{55.56\%} \]