Question

which statements about primers are correct? they provide a 3’-oh group for attachment of dna nucleotides. they are synthesized by an enzyme called primase. they are synthesized by dna polymerase α. they are needed for the start of dna synthesis.

Explanation:

• Primers are short nucleic acid sequences that have a free 3'-OH end, which DNA polymerases use to add new DNA nucleotides.
• Primase is the enzyme responsible for synthesizing RNA primers (used in DNA replication).
• DNA polymerase cannot initiate DNA synthesis de novo; it requires a primer to start adding nucleotides, so primers are essential for the start of DNA synthesis.
• DNA polymerase does not synthesize primers; it extends from them.

Answer:

• They provide a 3'-OH group for attachment of DNA nucleotides.
• They are synthesized by an enzyme called primase.
• They are needed for the start of DNA synthesis.