Repeated USMLE Questions Step 1- Review- 347

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Q- A middle-aged male presents with an edematous circular skin lesion of black eschar. Which of the following bacteria is the most likely causative organism of this condition?

A- Bacillus anthracis

B- Pneumonitis aeruginosa

C- Staphylococcus aureus

D- Streptococcus viridans

A- Bacillus anthracis- A painless, edematous skin lesion with a black eschar is characteristic of cutaneous anthrax, caused by Bacillus anthracis.

 

Q- During spermatogenesis, which type of cells enter meiosis 1 to form primary spermatocytes?

A- Primordial germ cells

B- Spermatids

C- Type A spermatocytes

D- Type B spermatocytes

D- Type B spermatocytes- Type B spermatogonia differentiate and enter meiosis I to become primary spermatocytes. Primordial germ cells and spermatids are earlier and later stages, respectively, and type A spermatogonia function mainly as stem cells for renewal.

 

Q- Which type of bias is reflected when individuals with severe disease are uncovered because they die first?

A- Confounding bias

B- Late-look bias

C- Measurement bias

D- Selection bias

B- Late-look bias- Late-look bias occurs when individuals with severe disease are missed in a study because they die early, making the condition appear less severe or less prevalent than it actually is.

 

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Dr Ray Makar
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2 thoughts on “Repeated USMLE Questions Step 1- Review- 347”

  1. I promise I will put more surgery MCQs, Dr. Nemo as much as my time allowed. Thank you so much

  2. I wish I could find Surgery MCQ as comparable as others.

    Thank you for your time, energy and resources. Salute Doc!!

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