Correct Answer: A

Rationale: The correct answer is A: Syphilis. The presentation of painless inguinal lymph nodes, along with a small-sized ulcer with thickened edges and a "laquer" bottom of greyish color on the genital mucous membrane, is classic for primary syphilis. The painless nature of the lymph nodes and the specific characteristics of the ulcer are key features of syphilitic infection. Primary syphilis is caused by the bacterium Treponema pallidum and typically presents with a single, painless ulcer known as a chancre. It is important to consider syphilis in the differential diagnosis of genital ulcers.

Summary of other choices:
B: Tuberculosis - Unlikely, as tuberculosis typically presents with pulmonary symptoms and does not cause genital ulcers.
C: Lepra - Unlikely, as leprosy does not typically present with painless inguinal lymph nodes and the specific ulcer characteristics described.
D: Trophic ulcer - Unlikely

Correct Answer: B

Rationale: The correct answer is B: Order. The suffix -virales is used in virology to denote the order level in the taxonomy of viruses. Orders are higher taxonomic ranks compared to species, family, and genus. The suffix -virales is specifically assigned to virus orders, making choice B the correct one. The other choices (A, C,
D) are incorrect because the suffix -virales does not apply to species, family, or genus in the taxonomic classification of viruses.

Correct Answer: D

Rationale: The correct answer is D, Vancomycin, because it is not a beta-lactam antibiotic. Beta-lactam antibiotics contain a beta-lactam ring in their molecular structure, which Vancomycin lacks. Benzylpenicillin, Cephalosporin, and Monobactam all contain the beta-lactam ring, making them beta-lactam antibiotics. Vancomycin belongs to a different class of antibiotics called glycopeptides.

Correct Answer: C

Rationale: The correct answer is C: 8. The embryonic phase in humans lasts until the end of week 8. During this time, the major organs and structures of the body begin to form. After week 8, the developing organism is referred to as a fetus.
Choice A (2) is too early for this transition to occur,
Choice B (6) is also premature, and
Choice D (12) is too late as the embryonic phase ends before week 12.
Therefore, the correct answer is C (8) as it accurately reflects the timeline of embryonic development in humans.

Correct Answer: C

Rationale:
Rationale:
1. Bacillus anthracis is a spore-forming bacterium that can survive for decades in the soil.
2. The spores are resistant to harsh conditions and can remain dormant for long periods.
3. This resilience allows Bacillus anthracis to persist in the old cattle burial ground for over 50 years.
4. Mycobacterium bovis, Brucella abortus, and Francisella tularensis are not known for long-term survival in soil.
Summary:
- Mycobacterium bovis, Brucella abortus, and Francisella tularensis do not have the spore-forming ability.
- Mycobacterium bovis causes tuberculosis in cattle.
- Brucella abortus causes brucellosis in cattle.
- Francisella tularensis causes tularemia in animals and humans.