1 DNA and proteins are key molecules of the cell nucleus. 2  One gene makes one protein. 3  A gene is made of DNA. 4  Bacteria and viruses have DNA too. 5  The DNA molecule is shaped like a twisted ladder. 6  A half DNA ladder is a template for copying the whole.  RNA is an intermediary between DNA and protein.
1 Another theory holds that depression may directly damage the brain, leading to dementia. âSimply put, chronic stress and/or depression may result in the release of cortisol,â Gorman says. Over time, this stress hormone can harm the brain, she says.  A third theory points to reduced brain volume.
But repetition can be stressful for the caregiver. Remember that it is the disease causing the behavior, not the person. The main cause of behavioral symptoms in Alzheimer's and other progressive dementias is the deterioration of brain cells which causes a decline in the individual's ability to make sense of the world. In the case of repetition, the person may not remember that she or he has just asked a question or completed a task.