Cell Structure and DNA Functions

The video tutorial explains the role of DNA and the nucleus in cellular functions. It covers the structure of the nucleus, including the nuclear envelope and nucleoplasm, and details the organization of chromatin and chromosomes. The process of DNA replication and cell division is discussed, highlighting the importance of DNA duplication for cell reproduction. The structure of DNA, including the double helix and base pairing rules, is also explained, emphasizing the complementary nature of DNA strands.

What is the primary role of the nucleus in a cell?

• To transport nutrients

• To store and protect DNA

• To synthesize proteins

• To produce energy for the cell

What is the function of nuclear pores?

• To synthesize DNA

• To produce energy

• To regulate the passage of materials between the nucleus and cytoplasm

• To store ribosomal RNA

What is the nucleolus responsible for?

• Manufacturing ribosomal RNA

• Synthesizing proteins

• Storing genetic information

• Regulating cell division

How is DNA organized within the nucleus?

• As a single long strand

• In the form of chromatin and chromosomes

• In circular loops

• As separate molecules

What happens to chromatin during cell division?

• It expands

• It condenses into chromosomes

• It breaks apart

• It dissolves

Why is DNA replication important for organisms?

• To produce energy

• To regulate cell metabolism

• To ensure each new cell has a complete set of DNA

• To create new proteins

Which cells in the body do not typically divide?

• Epithelial cells

• Liver cells

• Skin cells

• Nerve cells

What is the structure of a DNA molecule?

• A single-stranded helix

• A double-stranded helix

• A triple-stranded helix

• A quadruple-stranded helix

Which base pairs with adenine in DNA?

• Uracil

• Cytosine

• Guanine

• Thymine

What determines the genetic code in DNA?

• The length of the DNA strand

• The sequence of bases

• The number of nucleotides

• The shape of the DNA molecule