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Diabetes mellitus is a metabolic disease that is characterized by the buildup of glucose in the blood, or hyperglycemia. Diabetes results either from the pancreas not being able to produce the hormone insulin (type 1 diabetes) or if the body's cells become resistant to insulin (type 2 diabetes) . Insulin is a protein that binds to receptors on cell surfaces to allow glucose to enter the cell.
In order to manage the disease, type 1 diabetics require frequent insulin injections. Until the 1970s, insulin was obtained from processing the pancreases of large mammals such as cows and pigs; it was then purified for medicinal use. This all changed in the 1970s with the advent of recombinant DNA technology, which allows scientists to insert genes from other species into bacterial plasmids and have bacteria produce proteins from these other species' genes. In 1978, the gene that codes for human insulin was added to a bacterial plasmid and bacteria were used to produce human insulin. These bacteria acted as mini-factories that produced human insulin for type 1 diabetes patients. Today, the production of human insulin from bacteria is commonplace and is a multibillion dollar market for pharmaceutical companies.
-In order to add the gene for human insulin to a bacterial plasmid, the DNA molecules have to be "cut" with enzymes called restriction endonucleases and then pasted back together with enzymes called DNA ligases. Imagine that during this process, the first five nucleotides of the human insulin gene were accidentally cut out before it was pasted into the bacterial plasmid. What is the most likely outcome if this plasmid was added to bacterial cells?
Repression
In psychoanalytic theory, the process of unconsciously excluding thoughts, feelings, or desires from consciousness, often because they are considered unacceptable.
Conscious Awareness
The state of being mentally alert and having an active awareness of thoughts, feelings, sensations, and surroundings.
Oedipus Complex
An idea in the realm of psychoanalytic theory that denotes an unconscious sexual longing a child feels for their parent of the opposite sex, alongside feelings of jealousy towards their parent of the same sex.
Penis Envy
A term from Freudian psychoanalysis referring to a girl's supposed feelings of envy towards males for having a penis, seen as a critical phase in female psychosexual development.
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