Question

independent practice: part 1
task: read each phrase. for each:

• identify if the statement is correct \\(\checkmark\\) or incorrect \\(\times\\)
• write your choice in the \correct or incorrect?\ column.
• in the \why?\ column, explain your reasoning in one complete sentence using what you know about dna replication.

scenario\tcorrect \\(\checkmark\\) or incorrect \\(\times\\)?\twhy?

1. a dna molecule unzips and each strand is used as a template.
2. after replication, one dna molecule has two brand - new strands.
3. enzymes help unzip and build the new dna strands.
4. each new dna molecule has one old strand and one new strand.
5. dna replication happens during the g1 phase of the cell cycle.
6. mistakes during dna replication can cause mutations.

Explanation:

1. In DNA replication, the molecule unzips and each strand serves as a template. So it's correct.
2. DNA replication is semi - conservative, so one molecule cannot have two new strands. It's incorrect.
3. Enzymes like helicase unzips and DNA polymerase builds new strands. So it's correct.
4. Due to semi - conservative replication, each new DNA has one old and one new strand. So it's correct.
5. DNA replication occurs during S phase, not G1. So it's incorrect.
6. Errors in DNA replication can lead to changes in the DNA sequence, i.e., mutations. So it's correct.

Answer:

1. Correct. Reason: DNA replication starts with unzipping and using strands as templates.
2. Incorrect. Reason: DNA replication is semi - conservative, not creating all - new molecules.
3. Correct. Reason: Enzymes play key roles in unzipping and building new strands.
4. Correct. Reason: Semi - conservative replication results in one old and one new strand per molecule.
5. Incorrect. Reason: DNA replication occurs in S phase, not G1.
6. Correct. Reason: Mistakes in replication can cause mutations.