Exploring DNA Structure and Replication

The video tutorial covers the structure and replication of DNA. It explains the components of DNA, including nucleotides, and the double helix structure. The tutorial details the base pairing rules, highlighting the hydrogen and covalent bonds that hold the DNA strands together. It distinguishes between purines and pyrimidines and their roles in DNA and RNA. The video outlines the DNA replication process, emphasizing the semi-conservative nature of replication and the roles of helicase and polymerase enzymes. Finally, it compares DNA replication in prokaryotes and eukaryotes, noting the differences in replication sites and processes.

What does the 'D' in DNA stand for?

• Deoxyribose

• Deoxyribonucleic

• Dextrin

• Dextrose

Which component is NOT part of a nucleotide?

• Sugar

• Phosphate group

• Base

• Lipid

Which base pairs with adenine in DNA?

• Uracil

• Thymine

• Guanine

• Cytosine

How many hydrogen bonds connect guanine and cytosine?

• Two

• One

• Four

• Three

Which bases are purines?

• Cytosine and Guanine

• Adenine and Thymine

• Thymine and Cytosine

• Adenine and Guanine

During which phase does DNA replication occur?

• G1 phase

• M phase

• S phase

• G2 phase

What is the role of helicase in DNA replication?

• Proofreading

• Forming covalent bonds

• Breaking hydrogen bonds

• Adding nucleotides

Why is DNA replication considered semi-conservative?

• Each new DNA molecule has two old strands

• Each new DNA molecule has no old strands

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

• Each new DNA molecule has two new strands

How many replication sites are typically found in prokaryotic cells?

• One

• Three

• Two

• Multiple

What is a replication fork?

• A site where DNA is circular

• A site where DNA splits into two strands

• A site where DNA is proofread

• A site where DNA is synthesized