DNA Structure and Function Concepts

The video tutorial explains the importance of having a plan or set of instructions for building complex structures, including living cells. It highlights the characteristics of inherited instructions, such as stability, accuracy, and information content. The tutorial introduces DNA as the molecule that contains these instructions, describing its simple yet effective structure. DNA consists of two strands forming a double helix, with base pairs held together by hydrogen bonds. The video also covers the significance of base pairing and the stability of DNA, which is crucial for replication before cell division.

What is one of the key characteristics that inherited instructions must have?

• They should be invisible.

• They need to contain information.

• They should be difficult to copy.

• They must be unstable.

What is the molecule that contains the instructions for making a complete cell?

• Protein

• RNA

• Lipid

• DNA

What are the basic building blocks of DNA called?

• Amino acids

• Polysaccharides

• Nucleotides

• Fatty acids

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

• Adenine

• Uracil

• Thymine

• Cytosine

How do adenine and thymine pair in the DNA structure?

• Through covalent bonds

• Through metallic bonds

• Through hydrogen bonds

• Through ionic bonds

What is the significance of the base sequence in a DNA strand?

• It determines the color of the DNA.

• It is irrelevant to the DNA function.

• It affects the weight of the DNA.

• It is crucial for genetic information.

What is the role of hydrogen bonds in the DNA double helix?

• They cause the DNA to dissolve in water.

• They provide stability to the DNA structure.

• They make the DNA rigid.

• They prevent DNA replication.

Why do the two strands of a DNA double helix need to separate?

• To change the DNA sequence.

• To allow for DNA replication.

• To make the DNA more stable.

• To prevent mutations.

What process requires the separation of DNA strands?

• Replication

• Translation

• Mutation

• Transcription

In what way is DNA similar to a zip fastener?

• It can be opened and closed easily.

• It is made of metal.

• Individual links are weak, but overall it is stable.

• It is used to fasten things together.