Question

select the correct answer from each drop-down menu. rna primase synthesizes rna primer that attaches itself at the initiation point of replication. rna primer constructed during dna replication needs to be replaced because rna differs from dna. it contains instead of .

Explanation:

In DNA and RNA, the nitrogenous bases differ. DNA has thymine (T), while RNA has uracil (U) instead. The other bases (adenine, cytosine) are common to both. So for the first dropdown (what RNA contains instead of DNA's base), uracil is correct, and the second dropdown (the DNA base it replaces) is thymine (though the options for the second dropdown aren't fully visible, but from the first dropdown options and the context, the first blank should be uracil as RNA has uracil instead of thymine in DNA).

Answer:

First dropdown: uracil
Second dropdown (implied, as RNA has uracil instead of thymine in DNA): thymine (assuming the second dropdown has thymine as an option, though not fully shown; for the first dropdown with given options, uracil is correct)