USMLE

USMLE practice questions, page 6 of 25, with answer review and explanations.

Question 26

Which of the following is the approximate prevalence ratio for cystic fibrosis?

  1. 1: 25,000
  2. 1: 5,000
  3. 1: 2,000
  4. 1: 800

Question 27

Which of the following divisions of cell growth precedes Mitosis in the cell cycle?

  1. G
  2. G
  3. S
  4. G

Question 28

Down syndrome is directly linked to a genetic abnormality of chromosome?

  1. XXII
  2. XXI
  3. XIIX
  4. XV

Question 29

Which of the following is a characteristic of the Hardy-Weinberg law?

  1. Mating between species occurs at a set rate.
  2. Migration is a considerable factor.
  3. Mutation occurs at the locus
  4. Genotype selection does not occur at the locus

Question 30

Which of the following is not a characteristic of Hurler's syndrome?

  1. Autosomal recessive condition
  2. Associated with delayed mental development
  3. Spasticity
  4. Corneal deficits