Question

number the image of dna replication below in order of events.
place the steps of dna replication in order from beginning to end.
_____ two new identical semi - conservative strands of dna are created
_____ dna polymerase attaches free floating nucleotides to their open complementary base.
_____ the hydrogen bond between nitrogen bases is broken and dna is unzipped by the enzyme helicase.
_____ the enzyme ligase then proceeds to attach the new nucleotides together.
match the enzyme to its role in dna replication.
a. dna helicase _____ attaches free nucleotides to complementary bases
b. rna primase _____ tells dna polymerase where to start replication
c. dna polymerase _____ glues new nucleotides together creating the new strand
d. ligase _____ breaks hydrogen bonds holding nitrogen bases together
label each strand as original or new.
a._____
b._____
c._____
d._____

Explanation:

Step1: Determine the order of DNA replication steps

• First, the hydrogen bond between nitrogen bases is broken and DNA is unzipped by the enzyme helicase.
• Then, DNA Polymerase attaches free - floating nucleotides to their open complementary base.
• After that, the enzyme Ligase then proceeds to attach the new nucleotides together.
• Finally, two new identical semi - conservative strands of DNA are created.

Step2: Match the enzymes to their roles

• DNA Helicase breaks hydrogen bonds holding nitrogen bases together.
• RNA Primase tells DNA Polymerase where to start replication.
• DNA Polymerase attaches free nucleotides to complementary bases.
• Ligase glues new nucleotides together creating the new strand.

Step3: Label the strands (assuming a standard replication fork diagram where the two original strands are separated and new strands are built off them. For example, if in a replication fork, the two strands that were part of the original double - helix are original, and the ones being synthesized are new. But without seeing the exact diagram for labeling A - D, we assume a general case. If we consider a replication fork with two original strands (let's say the ones that were unzipped first) and two new strands being built)

Answer:

• Order of DNA replication steps: 4 (Two new identical semi - conservative strands of DNA are created), 2 (DNA Polymerase attaches free floating nucleotides to their open complementary base), 1 (The hydrogen bond between nitrogen bases is broken and DNA is unzipped by the enzyme helicase), 3 (The enzyme Ligase then proceeds to attach the new nucleotides together)
• Enzyme matching: A. DNA Helicase - breaks hydrogen bonds holding nitrogen bases together; B. RNA Primase - tells DNA Polymerase where to start replication; C. DNA Polymerase - attaches free nucleotides to complementary bases; D. Ligase - glues new nucleotides together creating the new strand
• Strand labeling (assuming a simple replication fork with two original and two new strands): A. Original; B. New; C. Original; D. New (This is a very general assumption. If the diagram has a different configuration, the labels may change accordingly)