What type of organism are yeasts classified as?

Yeasts are classified as eukaryotic true fungi, which is why this answer is the best choice. Eukaryotic organisms are characterized by having cells with a membrane-bound nucleus and organelles. Yeasts are a type of fungus and share this fundamental cellular structure. Unlike prokaryotic organisms, which include bacteria, yeasts have complex cellular organization.

Fungi, including yeasts, play significant roles in various ecological processes, including decomposition and nutrient cycling. Yeasts are also essential in many fermentation processes, including bread-making and alcohol production, highlighting their importance in both nature and human industries.

The other options do not apply to yeasts: they are not prokaryotic bacteria, which are simpler unicellular organisms lacking a nucleus; nor are they viruses, which are acellular entities that require a host for replication; and they do not belong to the group of protozoa, which are single-celled eukaryotic organisms that often exhibit animal-like behaviors. Understanding yeasts as eukaryotic true fungi is essential for studying their biology and their applications in various fields.