Exploring DNA Structure and Replication

This video tutorial covers the basics of genetics, focusing on the structure and function of DNA and RNA. It explains nucleic acids, nucleotides, and the double helix structure of DNA, as well as the differences between DNA and RNA. The tutorial also discusses the basics of heredity, including the roles of DNA, chromosomes, and genes. Finally, it details the process of DNA replication, emphasizing its importance in cell division and genetic consistency.

What are the building blocks of nucleic acids?

• Monosaccharides

• Fatty acids

• Nucleotides

• Amino acids

Which nitrogen base is found only in RNA?

• Uracil

• Cytosine

• Thymine

• Adenine

What is the shape of DNA?

• Triple helix

• Single strand

• Circular

• Double helix

In DNA, which base pairs with adenine?

• Cytosine

• Guanine

• Uracil

• Thymine

What is the main structural difference between DNA and RNA?

• DNA is double-stranded, RNA is single-stranded

• DNA contains ribose, RNA contains deoxyribose

• DNA is single-stranded, RNA is double-stranded

• DNA contains uracil, RNA contains thymine

Which nitrogen base is not found in RNA?

• Thymine

• Cytosine

• Guanine

• Adenine

How many pairs of chromosomes do humans have in their body cells?

• 23 pairs

• 37 pairs

• 74 pairs

• 46 pairs

What is a gene?

• A section of DNA that codes for a protein

• A long strand of DNA

• A type of cell

• A type of chromosome

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

• G1 phase

• S phase

• M phase

• G2 phase

What is the result of DNA replication?

• Two different DNA molecules

• Two identical DNA molecules, each with two new strands

• Two identical DNA molecules, each with one old and one new strand

• One new DNA molecule