Question

Prokaryotes are
A. Unicellular
B. Multicellular
C. Both A and B
D. None of the above

Answer 1

Prokaryotes are single celled, microscopic organisms. Prokaryotes neither have a distinct nucleus with a membrane nor any other kind of specialized organelles. Bacteria or eubacteria and archaea or archaebacteria are the two main domains of prokaryotes. About over $4$ billion years ago, prokaryotic life started by feeding off the early carbon dioxide, carbon monoxide, nitrogen, steam, hydrogen, and ammonia atmosphere.

Complete answer:
Option A) Unicellular: Organisms that consist of a single cell are known as unicellular or single celled organisms. All prokaryotic organisms are unicellular and are mainly classified into bacteria and archaea. Most of the eukaryotic organisms are multicellular, but organisms such as protozoa, unicellular algae, and unicellular fungi are unicellular.
Hence option A is the correct answer.
Option B) Multicellular: Multicellular organisms are those organisms which are made up of more than one cell and are complex organisms. Multicellular organisms are mostly visible to the naked eye. Distinct organs and organ systems can be found in these types of organisms. These are eukaryotes and contain membrane-bound structures. Prokaryotes are not multicellular.
Hence option B is not correct.
Option C) Both A and B: Prokaryotes are unicellular but are not multicellular organisms.
Hence option C is incorrect.
Option D) None of the above: Since option A is already the correct answer.
So, option D is incorrect.

Hence, Option A Unicellular is the correct answer.

Note:
Prokaryotes typically have a diameter of about $0.1 - 5{\text{ }}\mu m$. The DNA of prokaryotes are not contained within a nucleus. Instead, their DNA is circular and can be found in the region known as nucleoid, which can be found floating in the cytoplasm. The existence of two different levels of cellular organization can be seen by the division between prokaryotes and eukaryotes; only the eukaryotic cells have an enveloped nucleus which contains the chromosomal DNA, and other membrane bound organelles.