AP BIOLOGY

THE MOLECULAR BASIS OF INHERITANCE

DNA REPLICATION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
DNA replication occurs through a complex series of steps involving several enzymes. Which of the following represents the correct order beginning with the earliest activity of enzymes involved in DNA replication?
A
helicase RNA primase, DNA polymerase, ligase,
B
DNA polymerase, RNA primase, helicase, ligase
C
RNA primase, DNA polymerase, ligase, helicase
D
Helicase, RNA primase, DNA polymerase, ligase
Explanation: 

Detailed explanation-1: -The order of enzymes in DNA replication include the following: DNA helicase, RNA primase, DNA polymerase, and finally DNA ligase. During the process of DNA replication, the double helix unwinds with the help of the enzyme DNA helicase.

Detailed explanation-2: -During DNA replications the enzymes are used in the following order: helicase, topoisomerase, RNA primase, DNA polymerase III, DNA polymerase I, DNA ligase.

Detailed explanation-3: -DNA replication requires other enzymes in addition to DNA polymerase, including DNA primase, DNA helicase, DNA ligase, and topoisomerase.

Detailed explanation-4: -Replication occurs in three major steps: the opening of the double helix and separation of the DNA strands, the priming of the template strand, and the assembly of the new DNA segment.

Detailed explanation-5: -Helicase (separate double-stranded DNA into single strands allowing each strand to be copied) DNA gyrase (reduces supercoiling which builds up during DNA unwinding) DNA ligase (Joins the discontinuously synthesized fragments)

There is 1 question to complete.