Question

The complementary strand for the following single strand of DNA is:
$5^{\prime }\leftarrow A-T-G-C-T\to 3^{\prime }$

• A. $3^{\prime }\leftarrow T-A-C-G-A\to 5^{\prime }$
• B. $3^{\prime }\leftarrow A-T-G-C-T\to 5^{\prime }$
• C. $5^{\prime }\leftarrow T-A-C-G-A\to 3^{\prime }$
• D. $5^{\prime }\leftarrow A-A-C-G-T\to 3^{\prime }$

Answer 1

The correct option is A $3^{\prime }\leftarrow T-A-C-G-A\to 5^{\prime }$

The complementary strand of a single strand of DNA follows the base pairing rule, according to which $A$ pairs with $T$ and $G$ pairs with $C$ and the two strands run in opposite directions.
$\therefore$
The complementary strand for the given single strand of DNA is
$3^{\prime }\leftarrow T-A-C-G-A\to 5^{\prime }$