DNA Structure and Function Concepts

Janice Granetti explains why children resemble their parents by discussing DNA's role in determining physical traits and susceptibility to diseases. She describes the structure of DNA, highlighting its double helix form and the four nitrogenous bases: adenine, thymine, cytosine, and guanine. Granetti explains the pairing rules of these bases and distinguishes between purines and pyrimidines, emphasizing their chemical differences. The video concludes with a summary of how DNA's complex structure defines individual characteristics.

What role does DNA play in the human body?

• It helps in muscle growth.

• It controls our emotions.

• It is responsible for digestion.

• It determines our physical traits and disease susceptibility.

How is DNA structured within a cell?

• As a triple helix.

• As a circular loop.

• As a double helix.

• As a single strand.

What do the colored rungs on the DNA ladder represent?

• Different types of sugars.

• Different types of proteins.

• Different types of lipids.

• Different nitrogenous bases.

Which of the following is NOT a nitrogenous base in DNA?

• Uracil

• Thymine

• Cytosine

• Adenine

Which base pairs with adenine in DNA?

• Thymine

• Guanine

• Uracil

• Cytosine

What are the two categories of nitrogenous bases in DNA?

• Proteins and Lipids

• Purines and Pyrimidines

• Sugars and Phosphates

• Acids and Bases

Which bases are classified as purines?

• Adenine and Guanine

• Thymine and Cytosine

• Cytosine and Guanine

• Adenine and Thymine

What is the main structural difference between purines and pyrimidines?

• Pyrimidines have three carbon-nitrogen rings.

• Purines have two carbon-nitrogen rings.

• Pyrimidines have two carbon-nitrogen rings.

• Purines have one carbon-nitrogen ring.

What does the DNA helix ultimately determine?

• The color of our clothes.

• The structure of our bones.

• Our individual characteristics.

• The taste of our food.

Who is the presenter of the video?

• James Watson

• Marie Curie

• Janice Granetti

• Rosalind Franklin