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While mRNA vaccines have numerous benefits, they also present unique challenges. Which of the following is a significant challenge associated with the development and storage of the original COVID mRNA vaccines?

The central dogma of molecular biology states that genetic information flows from DNA to RNA to protein. However, certain viruses, such as HIV, can synthesize DNA from an RNA template. What is the name of this process?

When a person eats a meal rich in carbohydrates, their pancreatic cells begin to produce and secrete the protein insulin, which helps the body process sugar. When the blood sugar returns to normal, the insulin production stops. What is the benefit of this ability to turn gene expression on and off in response to a signal?

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

Scientists are exploring the use of a gene drive to spread a gene for sterility throughout a population of disease-carrying mosquitos. What is a key difference between using a gene drive and using traditional selective breeding to achieve this goal?

A sterile male release program involves releasing a large number of radiation-sterilized male mosquitos into a wild population. When a sterile male mates with a wild female, what is the expected outcome for the population?

A friend tells you she thinks genetically modified organisms are harmful to the environment, too dangerous to use, and that she avoids them. How might you respond to her comments, and what factual information could you share that might help her understand them better and perhaps worry less? How are GMOs created and used, and how does this compare with traditional breeding approaches? Please explain briefly but clearly in a full paragraph (minimum 4-5 sentences).

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

The influenza vaccine and many other vaccines you have likely received usually consist of either proteins representing the pathogen, or an inactivated (“killed”) or otherwise “attenuated” (harmless) version of the pathogen. In response to the vaccine, B lymphocytes of your body produce antibodies that bind specifically to the protein or pathogen. This effectively “trains” your immune system to be able to rapidly and powerfully respond if you are exposed to the actual pathogen, thereby protecting you. By contrast, the Pfizer and Moderna vaccines for the coronavirus SARS-CoV-2 that is causing the global pandemic are instead mRNA vaccines, meaning they consist of mRNA sequences of genes from the coronavirus. Each contains the mRNA that codes for the viral spike protein, a protein on the surface involved in attachment and uptake by the cell. If classical vaccines rely on the injection of a protein in order for the immune system to respond to produce antibodies that bind that protein, what is the mechanism of this mRNA vaccine? I.e., how does this mRNA vaccine elicit a proper immune response yielding antibody production that will bind and block the coronavirus? What do the antibodies bind to on the virus? Please explain briefly but clearly in a full paragraph (minimum 4-5 sentences).

A scientist is using a bacterium to produce a human protein. To do this, they create a version of the human gene from mRNA that has the introns removed. Why is it important to remove the introns from the gene before inserting it into the bacterium?