DNA Replication Concepts and Processes

The video explains DNA replication, focusing on its occurrence during the S phase of the cell cycle. It details the structure of DNA, highlighting nucleotides and complementary base pairing. Key enzymes like helicase and DNA polymerase are discussed, emphasizing their roles in unzipping the DNA and synthesizing new strands. The concept of semiconservative replication is introduced, ensuring accuracy in DNA copying.

During which phase of the cell cycle does DNA replication occur?

• G1 phase

• S phase

• G2 phase

• M phase

What are the building blocks of DNA?

• Nucleotides

• Fatty acids

• Monosaccharides

• Amino acids

Which base pairs with adenine in DNA?

• Thymine

• Uracil

• Guanine

• Cytosine

What holds the nitrogen bases together in the DNA structure?

• Covalent bonds

• Ionic bonds

• Hydrogen bonds

• Metallic bonds

What is the role of helicase in DNA replication?

• Joins Okazaki fragments

• Adds RNA primers

• Synthesizes new DNA strands

• Unzips the DNA double helix

What does DNA polymerase do during replication?

• Removes RNA primers

• Unwinds the DNA helix

• Adds nucleotides to the new strand

• Ligates DNA fragments

Which enzyme is responsible for adding nucleotides to the growing DNA strand?

• Primase

• DNA polymerase

• Ligase

• Helicase

What is the result of DNA replication?

• Two identical DNA molecules

• One new and one old DNA molecule

• Two different DNA molecules

• One RNA and one DNA molecule

What does semiconservative replication mean?

• Each new DNA molecule has two old strands

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

• Each new DNA molecule is completely new

• Each new DNA molecule has two new strands

Why is semiconservative replication important?

• It requires less energy

• It ensures fewer mistakes during replication

• It speeds up the replication process

• It allows for more genetic variation