Arrange the following statements about DNA replication in the correct order. Complimentary nitrogen bases are added to original DNA strand by DNA polymerase.
Helicase unzips the molecule of DNA to begin the process of DNA replication.
RNA primers are placed by primase to direct DNA polymerase on where to build.
DNA fragments are sealed by Ligase to end the process of DNA replication.

1. Ligase  - 5. joins the Okazaki fragments together

(Ligase is involved in joining the okazaki fragments together by sealing the nicks of the DNA strand.

2. Helicase - 1. unwinds the DNA molecule

(Helicase separates the two DNA strands at the replication fork.)

3. Polymerase - 2. synthesizes the complementary daughter strands

(Polymerase synthesizes the complementary daughter strand by adding nucleotides to the DNA.)

4. Topoisomerase - 4. creates nicks ahead of the replication fork to relieve tension from unwinding

(The highly coiled DNA is relaxed by creating nick ahead of the replication fork in the phosphate backbone of DNA strands.)

5. RNA primase - 3. synthesizes RNA primer at the initiation point

(RNA primase synthesizes an RNA primer (short sequence of RNA).)

Explanation:

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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