Multiple choice

Which unit modifies phage DNA so that it can resist bacterial restriction enzymes after absorption?

  1. 5-Hydroxymethyltyrosine

  2. 5-Hydroxymethyl guanine

  3. 5-Hydroxymethyladenosine

  4. 5-Hydroxymethylcytosine

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Delayed early genes code for 5-hydroxymethylcytosine, which destroys precursors of cytosine deoxynucleotides, so that no more bacterial cytosine will be incorporated into phage DNA.