Functions and Roles of DNA Elements

The video explores the concept of junk DNA, initially thought to be useless, but later found to have significant roles in gene regulation and expression. It discusses various non-coding regions like promoters, enhancers, silencers, introns, telomeres, and tandem repeats, highlighting their functions and importance. The video also touches on the use of tandem repeats in DNA profiling for forensic and paternity tests. It concludes by emphasizing the complexity of DNA and the potential for future discoveries in understanding diseases.

What percentage of DNA is responsible for coding proteins?

• 99%

• 50%

• 10%

• 1%

What was the initial belief about the function of non-coding DNA?

• It was essential for protein synthesis.

• It was involved in energy production.

• It had no purpose.

• It was responsible for genetic mutations.

What role do enhancers play in gene expression?

• They bind proteins to activate transcription.

• They degrade mRNA.

• They initiate DNA replication.

• They silence gene expression.

Which of the following is NOT a function of silencers?

• Inhibiting gene expression.

• Providing binding sites for specific proteins.

• Enhancing transcription.

• Preventing RNA polymerase from binding to the promoter.

Where are introns found?

• In prokaryotic DNA only.

• In both prokaryotic and eukaryotic DNA.

• In eukaryotic DNA only.

• In mitochondrial DNA only.

What is the believed function of telomeres?

• To code for proteins.

• To protect DNA during replication.

• To initiate transcription.

• To splice mRNA.

What are tandem repeats?

• Sequences that initiate DNA replication.

• Repeated sequences of DNA base pairs.

• Non-repetitive sequences in DNA.

• Sequences that code for proteins.

How do tandem repeats vary among individuals?

• They are absent in some individuals.

• They vary in the number of repeats.

• They vary in the sequence of base pairs.

• They are identical in all individuals.

In what field are tandem repeats particularly useful?

• Agriculture

• Marine biology

• Forensic science

• Astronomy

What technique is used to analyze tandem repeats in forensic investigations?

• Polymerase chain reaction

• Gel electrophoresis

• Chromatography

• DNA sequencing