In bacteria, the trp operon contains genes for the synthesis of the amino acid tryptophan. When tryptophan is abundant, it acts as a corepressor, binding to the repressor protein and enabling it to bind to the operator, which stops transcription. What type of control is this?

The rapid development and deployment of mRNA vaccines for COVID-19 highlighted their unique advantages. What is a key benefit of mRNA vaccines over traditional vaccine types (e.g., those using an inactivated virus)?

Forensic scientists collect samples from a crime scene and three suspects, process, and produce the following DNA “fingerprint” images. In the “crime scene” lane, which fragment is the largest? Photo credit: National Human Genome Research Institute

A pharmaceutical company is using artificial intelligence (AI) to analyze large amounts of genomic data from thousands of patients with a rare form of cancer. What is the key role of AI in this process?

Both transcription and translation are fundamental processes of gene expression. What is the key difference between the two processes?

The genetic code is described as “redundant” or “degenerate” because a single amino acid can be encoded by more than one codon. What is a major advantage of this redundancy?

One of the common concerns regarding genetically modified organisms (GMOs) is that they pose a health risk to humans. What does the overwhelming consensus of peer-reviewed scientific studies and major scientific organizations say about the safety of currently available GMOs?

What amino acid sequence would be produced from the following mRNA sequence 5−AUG−CCG−UGU−UAA−3′?

When lactose is present in the environment, it binds to the repressor protein of the lac operon. This binding causes the repressor to change shape and detach from the DNA. What is the result of the repressor detaching from the DNA?

A double-stranded DNA molecule has a coding strand with the sequence 5′-ATG-CGC-TAC-3′ and a template strand with the sequence 3′-TAC-GCG-ATG-5′. What is the sequence of the mRNA transcript that would be produced from this gene?