Nokea
Specific receptor defects occur in:
- A. Guillain-Barre syndrome
- B. Myasthenia gravis
- C. Graves' disease
- D. Ulcerative colitis
Correct Answer: B
Rationale: Myasthenia gravis is characterized by antibodies against acetylcholine receptors at the neuromuscular junction, leading to muscle weakness.
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Whirlpool' sign in abdominal ultrasonogram is seen in
- A. Duodenal atresia
- B. Midgut volvulus
- C. Intussusception
- D. Anorectal malformation
Correct Answer: B
Rationale: The 'whirlpool' sign on abdominal ultrasound is characteristic of midgut volvulus, indicating twisting of the intestines around the mesenteric vessels.
Diastolic dysfunction and normal systolic function are recognized features of
- A. dilated cardiomyopathy
- B. hypertrophic cardiomyopathy
- C. left ventricular noncompaction
- D. restrictive cardiomyopathy
Correct Answer: D
Rationale: Restrictive cardiomyopathy is specifically characterized by diastolic dysfunction with preserved systolic function.
The following statements about immunoglobulins are false:
- A. IgG is not transferable across the placenta
- B. IgM is usually a pentamer
- C. IgE levels are raised in parasitic infestations
- D. IgD is important in antibody dependent cytotoxicity
Correct Answer: A
Rationale: IgG is not transferable across the placenta: IgG is the only immunoglobulin that crosses the placenta to provide passive immunity to the fetus.
Typical features of Down's syndrome include:
- A. Brachycephaly
- B. Hypotonia
- C. Male infertility
- D. Increased a-fetoprotein in amniotic fluid
Correct Answer: B
Rationale: Hypotonia is a key feature of Down's syndrome, often leading to delayed development and muscle weakness.
The following syndromes are caused by chromosomal abnormalities:
- A. Cri-du-chat syndrome
- B. Kearns-Sayre syndrome
- C. Marfan's syndrome
- D. Turner's syndrome
Correct Answer: D
Rationale: Turner's syndrome: Turner's syndrome is caused by a monosomy of the X chromosome, characterized by short stature, infertility, and heart defects.