In mid-december, a woman with insulin-dependent diabetes who had been on prednisone fell and received an abrasion on the dorsal side of her right hand. she was placed on penicillin. by the end of january, the ulcer had not healed, and she was referred to a plastic surgeon. on january 30, a swab of the wound was cultured at 35°c on blood agar. on the same day, a smear was made for gram staining. the gram stain showed large (10 µm) cells. brownish, waxy colonies grew on the blood agar. slide cultures set up on february 1 and incubated at 25°c showed septate hyphae and single conidia. the most likely cause of the infection is a
a. green algae--prokaryotic
b. fungal spores
c. dimorphic fungus
d. lichens

c. Dimorphic fungus

Explanation:

Many fungal species have structures such as septate hyphae and conidia at their ends. In addition, brownish and waxy colonies represent yeast fungi.

The 35 ° C temperature to which the cultures were exposed, however, are most supported by dimorphic fungi, which generally withstand temperatures between 35 and 37 degrees celsius in the yeast phase and their infectious forms are found in the tissues(as the woman's wound).

Given the above, the most likely cause of infection is a dimorphic fungus.

D. Both lack membrane-bound organelles and are single-celled.

Explanation:

All prokaryotes are classified in two domains Archaea and Eubacteria as they differ in some characteristics. But as they both are prokaryotes there is some similarities between Archaea and Eubacteria that is they both are single celled and lack membrane-bound organelles.

They both reproduce asexually by binary fission but both are autotrophic and heterotrophic. They both are unable to survive in lack of oxygen. They both have circular DNA and not helical DNA.

Hence, the correct option is D.