DNA Structure and Function Concepts

The video tutorial explains the structure and functions of DNA. DNA is a double helix composed of nucleotides, which code for genetic information. It serves as genetic material, determining traits like gender and eye color, and as hereditary material, allowing replication for cell division and offspring. DNA strands are antiparallel, running in opposite directions, with hydrogen bonds between strands and covalent bonds within strands. This structure allows DNA to replicate by unzipping into two strands, maintaining stability and integrity.

What is the structural shape of DNA?

• Quadruple helix

• Triple helix

• Double helix

• Single helix

Which of the following is NOT a nucleotide found in DNA?

• Uracil

• Thymine

• Cytosine

• Adenine

What is the primary function of DNA as genetic material?

• To provide energy for cells

• To code for an organism's traits

• To protect cells from damage

• To transport nutrients

How do the complementary strands of DNA assist in replication?

• They provide energy for replication

• They prevent DNA from unzipping

• They create mutations

• They act as templates for new strands

What does it mean for DNA strands to be anti-parallel?

• They run in the same direction

• They are perpendicular

• They run in opposite directions

• They are identical

In DNA, what is the orientation of one strand compared to the other?

• Both run from 5' to 3'

• One runs from 5' to 3' and the other from 3' to 5'

• One runs from 5' to 5' and the other from 3' to 3'

• Both run from 3' to 5'

What type of bond holds the two strands of DNA together?

• Ionic bonds

• Covalent bonds

• Metallic bonds

• Hydrogen bonds

Which bonds are stronger in DNA, those within strands or between strands?

• Neither, they are weak

• Both are equally strong

• Bonds between strands

• Bonds within strands

What happens to DNA after replication?

• It remains unzipped

• It disintegrates

• It forms a triple helix

• It reverts back to a double helix

Why is the double helix structure of DNA considered stable?

• Due to its triple helix structure

• Because of the hydrogen bonds between strands

• Because of the covalent bonds within strands

• Due to its single-stranded nature