Which of the following bacteria produces a toxin that inhibits protein synthesis?
ACorynebacterium diphtheriae
BBacillus anthracis
CStaphylococcus aureus
DVibrio cholerae
Pertussis toxin acts by all of the following mechanisms except ?
AIncrease cyclic AMP
BActs through G alpha subunit
CADP ribosylation of proteins associated with receptors
DIncreased calcium release from sarcoplasmic reticulum
An 8 year old boy complains of increasing muscle weakness. On examination, his calves are bulky and show muscle tightening. His serum creatine kinase levels are increasing with age. Which of the following is the most likely diagnosis?
ACongenital myopathy
BDystrophin deficiency
CMyelin deficiency
DHereditary sensorimotor neuropathy
EBecker muscular dystrophy
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