282+ quick-fire dental facts • tap a card to flip
At what level in the skin do bullae MOST likely develop in a localized cutaneous infection around the mouth with phage group II Staphylococcus aureus?
1) Across the basal cells
2) Below the basement membrane
3) Between the basal cells and the basement membrane
4) High in the epidermis
What is the primary lesion associated with an increased risk of adenocarcinoma of the distal esophagus?
1) Generalized fatigue
2) Goodpasture's syndrome
3) Barrett's esophagus
4) Sarcoma
Correct answer: B) In an Aa × Aa cross, offspring genotypes are 1 AA : 2 Aa : 1 aa. Since homozygous dominant (AA) is typically incompatible with life in true autosomal dominant disorders, and Aa individuals are affected, only the aa (25%) offspring are unaffected.
If both parents are heterozygous carriers of an autosomal dominant disorder allele (Aa × Aa), what proportion of offspring is expected to be completely unaffected?
1) 0%
2) 25%
3) 50%
4) 75%
Which of the following is NOT a typical feature of Paget disease of bone?
1) Mosaic pattern of newly formed woven bone
2) Increased hat size
3) Hypertension
4) Osteosclerotic bones in late stages
Epitheloid cells are characteristic of:
1. Chronic Infection
2. Granulation tissue
3. Granulomatous Inflammation
4. Only In tuberculosis
Correct answer: B) NK cell inhibitory receptors (like KIR) are normally engaged by class I MHC on healthy cells, suppressing NK activity. When tumor cells or virus-infected cells downregulate class I MHC ("missing self"), inhibition is lost and activation signals dominate, triggering NK-mediated killing.
Natural killer (NK) cells are triggered to kill target cells primarily when the target shows:
1) Increased class I MHC expression
2) Decreased or absent class I MHC expression
3) Increased class II MHC expression
4) Normal class I MHC density
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NEET MDS