Question

directions: put the steps of dna replication in order by writing numbers 1 - 6 in the space before each statement. 1. two new molecules of dna are created. 2. the rna primer is built. 3. free nucleotides are attached to the exposed nitrogen bases at the 3 end of the template strand. 4. the dna uncoils and the hydrogen bonds between the nitrogenous bases are broken. 5. the cell starts the mitotic phase of the cell cycle. 6. rna nucleotides are removed and replaced by dna nucleotides.

Explanation:

Step1: Initial step of DNA replication

The DNA first has to uncoil and break the hydrogen - bonds between nitrogenous bases. So, 4 is the first step after the RNA primer is built (which is step 1 given). So 4 should be 2.

Step2: Nucleotide addition

Free nucleotides are attached to the exposed nitrogen bases at the 3' end of the template strand after the DNA is uncoiled. So 3 is 3.

Step3: RNA primer replacement

RNA nucleotides are removed and replaced by DNA nucleotides after nucleotides are added. So 6 is 4.

Step4: New DNA molecule formation

Two new molecules of DNA are created at the end of the replication process. So 1 is 5.

Step5: Mitotic phase

The cell starts the mitotic phase of the cell cycle after DNA replication is complete. So 5 is 6.

Answer:

1. 5
2. 1
3. 3
4. 2
5. 6
6. 4