Exploring DNA Structure and Replication

In this video, Sarah explains DNA replication in eukaryotic cells. She introduces the process, highlighting the role of enzymes like helicase, polymerase, and ligase. Helicase unzips the DNA, polymerase adds new nucleotides, and ligase glues the strands together. The concept of semiconservative replication is discussed, where each new DNA molecule contains an old and a new strand. The video concludes with a practical exercise on DNA replication and base pairing, emphasizing the importance of replication for cell division and tissue repair.

Where is DNA found in eukaryotic cells?

• Mitochondria

• Nucleus

• Ribosome

• Cytoplasm

Why is DNA replication important?

• To produce energy

• To build muscle, heal wounds, and repair tissues

• To transport nutrients

• To produce proteins

Tags

NGSS.HS-LS1-1

What is the function of the helicase enzyme in DNA replication?

• To add new nucleotides

• To unzip the DNA strands

• To glue DNA strands together

• To synthesize RNA

How can you remember the function of helicase?

• It synthesizes proteins

• It unzips your genes

• It glues DNA strands

• It adds nucleotides

What does the polymerase enzyme do during DNA replication?

• Unzips the DNA strands

• Adds new nucleotides to the DNA strands

• Glues DNA strands together

• Synthesizes RNA

Which enzyme is responsible for adding new nucleotides to the DNA strands?

• Ligase

• Helicase

• Topoisomerase

• Polymerase

What is the role of the ligase enzyme in DNA replication?

• To synthesize RNA

• To unzip the DNA strands

• To add new nucleotides

• To glue DNA strands together

What is semiconservative replication?

• Each new DNA molecule has no old strands

• Each new DNA molecule has two old strands

• Each new DNA molecule has one old strand and one new strand

• Each new DNA molecule has two new strands

When does DNA replication typically occur?

• Before cell division

• During RNA transcription

• After cell division

• During protein synthesis

What color should adenine be dyed in the practical exercise?

• Red

• Blue

• Green

• Yellow