A 6-Month-Old Boy Is Evaluated in the Clinic Due to Delayed

question 100

Multiple Choice

A 6-month-old boy is evaluated in the clinic due to delayed motor development.  The mother reports that the boy is weaker than other children his age.  He can barely lift his head up when prone and is unable to roll to the side.  Physical examination shows generalized hypotonia and decreased deep tendon reflexes.  Further evaluation reveals mutation of a protein involved in the assembly of small nuclear ribonucleoproteins (snRNPs) in motor neurons.  This patient most likely has impaired function of which of the following cellular elements?

• A)Nucleosomes
• B)Peroxisomes
• C)Proteasomes
• D)Ribosomes
• E)Spliceosomes

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