Question

the sequence of nucleotides in a single strand of dna is shown below.
tga gtg aat cat
which of the following represents the complementary dna strand?
(1 point)
○ acu cac uua gua
○ gtc tgt ccg acg
○ cag aca ggc tgc
○ act cac tta gta

Explanation:

Step1: Recall DNA base - pairing rules

In DNA, adenine (A) pairs with thymine (T), and cytosine (C) pairs with guanine (G).

Step2: Find the complementary strand

For the given strand TGA GTG AAT CAT:

• T pairs with A, G pairs with C, A pairs with T.
• For "TGA": T→A, G→C, A→T, so it becomes "ACT".
• For "GTG": G→C, T→A, G→C, so it becomes "CAC".
• For "AAT": A→T, A→T, T→A, so it becomes "TTA".
• For "CAT": C→G, A→T, T→A, so it becomes "GTA".

Answer:

ACT CAC TTA GTA