Exploring the CRISPR-Cas9 Gene Editing Revolution

What is the main idea behind gene editing?

• To create new genes

• To remove DNA entirely

• To fix mutations in DNA

• To duplicate DNA sequences

Which was the first reliable method of genome editing developed in 1994?

• CRISPR-Cas9

• TALENs

• Zinc Finger Nucleases

• Base Editing

What is the main advantage of TALENs over Zinc Finger Nucleases?

• TALENs are cheaper

• TALENs recognize one base pair per module

• TALENs are faster

• TALENs are more specific

What did scientists discover in the DNA sequences of bacteria in the late 1980s?

• No significant patterns

• Only palindromic sequences

• Randomly scattered sequences

• Clusters of regularly-spaced repeating sequences

What role do Cas1 and Cas2 proteins play in the CRISPR system?

• They bind to RNA

• They identify and cut viral DNA segments

• They transcribe DNA

• They cut DNA at random locations

What innovation did Jennifer Doudna and Emmanuelle Charpentier introduce to the CRISPR-Cas9 system?

• Using Cas1 and Cas2 for gene editing

• Creating TALENs

• Combining crRNA and tracrRNA into a single guide RNA

• Developing Zinc Finger Nucleases

What is the function of a 'dead' version of Cas9?

• To transcribe RNA

• To create new DNA sequences

• To bind specific DNA without cutting

• To cut DNA more efficiently

What is the PAM sequence that Cas9 looks for adjacent to the protospacer?

• TAC

• CGT

• ATG

• NGG

What is one potential risk of using CRISPR-Cas9 technology?

• It might cause unwanted off-target edits

• It cannot be used in humans

• It is not specific enough

• It is too expensive

What is base editing in the context of CRISPR-Cas9?

• Deleting entire genes

• Inserting new DNA sequences

• Changing nitrogenous bases chemically

• Cutting DNA at specific sites