Where do the processes of gene expression occur in a human cell?

In a forensics lab, a small DNA sample is obtained from a crime scene and amplified. To identify the suspect, the amplified DNA is cut into fragments of different sizes and separated based on their length. Which technique is used to separate the fragments?

A scientist wants to insert a gene from a plant that confers herbicide resistance into a bacterium. The bacterial cell’s ribosomes and other gene expression machinery will then produce the plant protein. This process is possible because of which fundamental concept?

In mice, a diet rich in methyl groups (e.g., rich in folic acid) leads to the methylation of the agouti gene that controls coat color and obesity. A mother mouse fed this diet generally produces more offspring with brown fur who are thin, and fewer offspring with yellow fur who are obese. What does this example illustrate?

A polypeptide chain is being synthesized from an mRNA molecule with the sequence 5′AUG−GCA−UAU−3′. Which of the following is the correct sequence of amino acids that would be produced?

In the lac operon, when glucose levels are low, a protein called the catabolite activator protein (CAP) binds to the promoter region and helps RNA polymerase bind more efficiently, thereby increasing the rate of transcription. What type of control is this?

A common mechanism of epigenetics is the methylation of DNA, which can silence a gene. How can an epigenetic change, such as DNA methylation, be inherited across generations?

A forensic scientist finds a tiny amount of blood at a crime scene. To get enough DNA for a DNA fingerprinting analysis, the scientist needs to make millions of copies of the specific DNA sequence. What technique would the scientist use to quickly amplify the small amount of DNA?

A human liver cell and a human nerve cell both contain the same complete set of DNA. However, the liver cell produces proteins for metabolism and detoxification, while the nerve cell produces proteins for transmitting signals. What is the benefit of this differential gene expression between these two cell types?

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?