Which Statement BEST Reflects the Current Scientific Status Concerning the Role

question 27

Multiple Choice

Which statement BEST reflects the current scientific status concerning the role of genetics factors in causing Alzheimer's disease?

• A) A mutation on chromosome 17 causes Alzheimer's.
• B) There is evidence that specific genes may both increase and decrease the risk of Alzheimer's disease.
• C) The only genetic link is from data on individuals with both Alzheimer's and Parkinson's diseases.
• D) There is no scientific evidence that Alzheimer's has a genetic component.

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Definitions:

Precambrian

denotes the vast period of time before the Cambrian period, covering the formation of the Earth until about 541 million years ago.

Paleozoic

An era of geological time from about 541 to 252 million years ago, marked by the development of early life forms to the advent of reptiles and the end of the Permian period.

Mesozoic

An era of geological time from about 252 to 66 million years ago, known as the "Age of Reptiles" and marked by the dominance of dinosaurs.

Cenozoic

The most recent of the three major subdivisions of animal and plant life geologic time, covering the period from 66 million years ago to the present.