Question

histoplasmosis is a fungal disease characterized by coughing, chest pain, and fever. humans get the disease by breathing in spores of fungi in the genus histoplasma, which convert into pathogenic yeast cells. how do scientists know that histoplasma are fungi?
a the cells have a nucleus and are surrounded by a cell wall containing cellulose.
b the cells have chloroplasts and mitochondria but are not surrounded by a cell wall.
c the cells contain mitochondria and are surrounded by a cell membrane and a cell wall.
d the cells have a nucleus and are surrounded by a cell wall with chitin but do not have chloroplasts.

Explanation:

To determine why Histoplasma is classified as fungi, we analyze fungal cell characteristics:

1. Fungi are eukaryotic (have a nucleus), have cell walls with chitin, and lack chloroplasts (they are heterotrophic, unlike plants which have chloroplasts for photosynthesis).
2. Option 1: Fungal cell walls do not contain cellulose (plant cell walls do), so this is incorrect.
3. Option 2: Fungi have cell walls and lack chloroplasts, so this is incorrect.
4. Option 3: While fungi have mitochondria and cell walls, the key component of fungal cell walls (chitin) is not mentioned, and the lack of chloroplasts (a defining feature for distinguishing from plants) is not addressed here as clearly as in Option 4.
5. Option 4: Fungi are eukaryotic (nucleus), have cell walls with chitin, and no chloroplasts (since they don't photosynthesize). This matches fungal cell structure.

Answer:

The cells have a nucleus and are surrounded by a cell wall with chitin but do not have chloroplasts. (The option corresponding to this description, likely the fourth option in the list, e.g., if it's labeled as D, then D. The cells have a nucleus and are surrounded by a cell wall with chitin but do not have chloroplasts)