Which of the Following Statements Is True About Autism Spectrum

question 25

Multiple Choice

Which of the following statements is true about autism spectrum disorder (ASD) ?

• A)The symptoms of ASD have their onset between ages six and nine.
• B)The best predictor of the outcome of ASD is a child's IQ and the amount of language development before age six.
• C)The prevalence of ASD is not affected by socioeconomic status and parents' mental abilities.
• D)The prevalence of ASD has been decreasing in recent years, probably due to increased awareness of the disorder.

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Definitions:

Unspecialized Cells

Cells that have not yet differentiated into specific cell types and thus retain the capability to become multiple kinds of cells, also known as stem cells.

Specific Fate

The pre-determined developmental trajectory of a cell or organism, often genetically controlled.

Homeobox Transcription Factors

Proteins that bind DNA and regulate the expression of genes crucial for the development and structural layout of an organism.

Homeodomains

DNA-binding motifs found in transcription factors that are crucial for the regulation of development and gene expression.