Which nucleotide sequence is complementary to the mRNA sequence 5'-CGAUAC-3'?

To determine the complementary nucleotide sequence to the mRNA sequence 5'-CGAUAC-3', we first need to understand that the complementary nucleotides in RNA pair as follows: adenine (A) pairs with uracil (U), and cytosine (C) pairs with guanine (G).

Starting with the given mRNA sequence, 5'-CGAUAC-3', we will identify the complementary bases:

• C in mRNA pairs with G
• G pairs with C
• A pairs with U
• U pairs with A
• A pairs with U
• C pairs with G

When we pair these appropriately, we get the complementary sequence:

• G pairs with C
• C pairs with G
• U pairs with A
• A pairs with U
• U pairs with A
• G pairs with C

Thus, the complementary sequence from the mRNA 5'-CGAUAC-3' is 3'-GCUAUG-5'.

The complementary sequence is presented in the 3' to 5' direction because it reflects the directionality in which nucleotides are read and paired. Therefore, the correct answer is the one that shows this