Understanding Junk DNA

The video explores the concept of junk DNA, which makes up 99% of the human genome. It discusses the debate over whether non-coding DNA is functional or not, highlighting the roles of transcription factors and non-coding RNAs. The ENCODE project claimed 80% of the genome is functional, but faced criticism for its broad definition of functionality. Evolutionary biology offers insights into genome size differences among species. Studies suggest only 8-25% of the genome is functional, challenging ENCODE's claim. The video concludes that understanding genome functionality is complex and ongoing.

What percentage of the human genome is made up of genes that code for proteins?

• 50-60%

• 1-2%

• 10-15%

• 25-30%

What is the primary role of transcription factors in the genome?

• To code for proteins

• To bind to genes directly

• To regulate gene expression

• To replicate DNA

Which type of RNA is involved in assembling proteins?

• Micro RNAs

• Ribosomal RNAs

• Long non-coding RNAs

• Transfer RNAs

What was the main claim of the ENCODE project regarding the human genome?

• 100% of the genome is functional

• 10% of the genome is functional

• 80% of the genome is functional

• 50% of the genome is functional

Why was the ENCODE project's definition of 'functional' considered too generous?

• It considered any DNA that binds to transcription factors as functional

• It ignored non-coding RNAs

• It only focused on viral sequences

• It included only protein-coding regions

What is a pseudogene?

• A gene that regulates other genes

• A gene that is always active

• A gene that codes for multiple proteins

• A non-functional gene copy

Why might some organisms have more DNA than others?

• They are more complex

• They have more protein-coding genes

• They have accumulated more non-functional DNA

• They have fewer mutations

What is the estimated upper limit of functional DNA in the human genome according to some studies?

• 50%

• 25%

• 10%

• 80%

What is the main challenge in determining the functionality of DNA?

• Lack of technology

• Limited interest in the field

• Insufficient funding

• Complexity and variability in definitions

What does the term 'junk DNA' refer to?

• DNA with no known function

• DNA that codes for proteins

• DNA that is only found in humans

• DNA that is always active