Question 1

How many different genes are associated with the creation of the plaques found in Alzheimer's disease?

Accepted Answer

The answer of How many different genes are associated with...

Question 2

Vascular neurocognitive disorder and Alzheimer's disease have very similar

Accepted Answer

Vascular neurocognitive disorder and Alzheimer's disease both have similar cognitive symptoms, such as memory loss, confusion, disorientation, and problems with language and communication. While they may have some overlapping risk factors, such as age and genetics, their causes and rates of onset are distinct. Vascular neurocognitive disorder is caused by damage to the blood vessels in the brain, while Alzheimer's disease is characterized by the build-up of Amyloid plaques and neurofibrillary tangles in the brain, leading to the death of brain cells. Additionally, the onset of vascular neurocognitive disorder tends to be more abrupt and may be related to a specific event, such as a stroke, whereas Alzheimer's disease is characterized by a gradual decline in cognitive function over a period of years. Finally, while both conditions may lead to some motor impairments, such as difficulty with balance and coordination, these are usually more pronounced in vascular neurocognitive disorder.

Question 3

The average time between the diagnosed onset of Alzheimer's disease and death is

Accepted Answer

The average time between the diagnosed onset of Alzheimer's disease and death is about six to twelve years, with six years being the most commonly cited estimate. This can vary depending on factors such as age at diagnosis and overall health. Therefore, option C, six years, is the best choice.

Question 4

If the World Health Organization assembled the most respected researchers on the genetics of Alzheimer's disease and asked them to review the research,which of the following would be the most appropriate title for that report?

Accepted Answer

The title that best reflects the content of the report is "Alzheimer's Disease: No Single Genetic Path." This title accurately conveys the main finding of the report, which is that Alzheimer's disease has multiple genetic pathways and is not caused by a single gene or genetic mutation. Option A ("A Single Disease, a Single Gene") is not an accurate reflection of the report's findings, while options B ("How Toxins Affect Genetic Vulnerability") and C ("Link Identified: Distractibility as the Key") do not accurately reflect the focus of the study on the genetics of Alzheimer's disease.

Question 5

Pseudodementia refers to a condition in which

Accepted Answer

Pseudodementia is a condition in which cognitive impairment is produced by major depression. It is not a disorder in which symptoms are faked or where memory loss is not severe. Motor impairment affecting cognitive functioning is more commonly seen in conditions such as Parkinson's disease or Huntington's disease.

Question 6

Why are researchers who study Alzheimer's disease also very interested in Down syndrome?

Accepted Answer

Both Alzheimer's disease and Down syndrome are linked to chromosome 21. Individuals with Down syndrome have an extra copy of chromosome 21, which increases their risk of developing Alzheimer's disease. By studying individuals with Down syndrome, researchers can gain a better understanding of the genetic and molecular mechanisms underlying Alzheimer's disease.

Question 7

What is genetic linkage analysis?

Accepted Answer

Genetic linkage analysis involves exploring the genome of families that have multiple members affected with a disorder. By analyzing the inheritance patterns of genetic markers in these families, researchers can locate the specific gene responsible for the disorder or trait. Microscopic analysis of nerve cell damage (A) and educating family members about inheritance chances (C) are not directly related to genetic linkage analysis. Locating a gene responsible for a disorder or trait (D) is a key aspect of genetic linkage analysis, but B is the more specific and complete answer.

Question 8

The amyloid plaques and neurofibrillary tangles that are typical in Alzheimer's disease are also found in people with

Accepted Answer

Down syndrome is a genetic disorder that is characterized by intellectual disability and is caused by the presence of an extra copy of chromosome 21. People with Down syndrome are at an increased risk of developing Alzheimer's disease later in life, and they often develop amyloid plaques and neurofibrillary tangles in their brain similar to those found in people with Alzheimer's disease.

Question 9

A result of recent gene identification efforts is the

Accepted Answer

Recent gene identification efforts have led to a greater understanding and incorporation of gene-environment interaction. It is now widely recognized that both genetic and environmental factors contribute to the development of disorders. However, the identification of specific genes involved in disorders does not diminish our understanding of the etiology but rather enhances it by linking specific biological mechanisms to certain disorders. It is also not accurate to state that a single gene is responsible for most disorders as most disorders are multifactorial, involving multiple genes and environmental factors.

Question 10

One Swedish study of genetic factors in the cause of dementia found that the concordance rate for monozygotic twins was _____ percent.

Accepted Answer

The concordance rate for monozygotic twins is over 50% according to the Swedish study, indicating a strong genetic factor in the cause of dementia.

Question 11

Neurocognitive disorder with Lewy bodies overlaps with which of these disorders?

Accepted Answer

Neurocognitive disorder with Lewy bodies (DLB) shares symptoms and characteristics with both Parkinson's disease and Alzheimer's disease. In fact, DLB is often considered to be on a spectrum with these two disorders. People with DLB may experience motor symptoms similar to Parkinson's, such as tremors and stiffness, as well as cognitive symptoms similar to Alzheimer's, including memory loss and confusion. Therefore, option C is the correct answer, as it identifies both Parkinson's disease and Alzheimer's disease.

Question 12

A common cause of delirium among the elderly is

Accepted Answer

Urinary tract infections are a common cause of delirium in elderly people. Delirium is a sudden change in mental status characterized by confusion, disorientation, and impaired cognitive function. It can be triggered by a variety of factors, including medical illnesses, medication reactions, and metabolic imbalances, but infections such as UTIs are particularly common in elderly individuals with weakened immune systems. Other factors that can contribute to delirium in elderly patients include sleep deprivation, dehydration, and pain.

Question 13

Which of the following is an indication of vascular neurocognitive disorder?

Accepted Answer

Vascular neurocognitive disorder is characterized by the presence of focal neurological signs, such as weakness on one side of the body or difficulty speaking. Parkinsonian symptoms may be present in some cases but are not specific to vascular neurocognitive disorder. Affected large arteries and absence of laboratory evidence of blood vessel disease are also not specific indicators of vascular neurocognitive disorder.

Question 14

From the evidence so far,it seems that ________ is/are responsible for early-onset and late-onset Alzheimer's disease.

Accepted Answer

The evidence so far suggests that early-onset and late-onset Alzheimer's disease are caused by different genes. Early-onset Alzheimer's is often associated with genetic mutations in three specific genes, while late-onset Alzheimer's is believed to be caused by a combination of genetic and environmental factors. Therefore, it is not accurate to say that no genes (B) or the same gene (D) are responsible for both types of Alzheimer's disease. Pick's bodies (A) are abnormal structures found in the brains of individuals with a type of dementia called frontotemporal dementia, which is distinct from Alzheimer's disease.

Question 15

Approximately _____ percent of individuals over the age of 90 will exhibit symptoms of moderate to severe dementia.

Accepted Answer

Approximately 40 percent of individuals over the age of 90 will exhibit symptoms of moderate to severe dementia, reflecting the increased risk of dementia with advancing age.

Question 16

Which of the following statements is true with regard to the incidence of Alzheimer's disease (AD)?

Accepted Answer

After age 90, the incidence of AD apparently decreases for men because the population of men at that age is much smaller than the population of women.

Question 17

A pathologist has just finished an autopsy and includes in her report a reference to "Lewy bodies." This means that in her autopsy,she has discovered

Accepted Answer

Lewy bodies are rounded deposits in nerve cells that are often found in the brains of patients with Parkinson's disease. They are composed of proteins called alpha-synuclein and can cause the death of the neurons that contain them, leading to the symptoms of Parkinson's disease.

Question 18

Studies suggest that Alzheimer's disease

Accepted Answer

Studies suggest that Alzheimer's disease is more prevalent in North America and Europe than in other parts of the world. While it is also present in developing countries, the rates are generally lower than in developed countries. There is no evidence to suggest that Alzheimer's disease did not exist prior to the 1960s, but it might not have been as widely diagnosed or recognized.

Question 19

A new form of dementia has just been discovered,and researchers have determined that the disorder is transmitted genetically in an autosomal dominant pattern with complete penetrance.If a child's father has one of the genes,and the mother has none of the genes for the disorder,the probability that the child will inherit this disorder is _____ percent.

Accepted Answer

Autosomal dominant inheritance means that the disorder is carried on one of the non-sex chromosomes (autosomes) and that only one copy of the affected gene is needed to cause the disorder. Complete penetrance means that everyone who inherits the affected gene will develop the disorder. Therefore, if the father has one of the genes and the mother has none, the probability that the child will inherit the disorder is 100%.

Question 20

Approximately _____ percent of patients diagnosed with dementia also show signs of major depressive disorder.

Accepted Answer

Approximately 25 percent of patients diagnosed with dementia also show signs of major depressive disorder.

Quiz 14: Neurocognitive Disorders