Question

Membrane-bound organelles are absent in

• A. Saccharomyces
• B. Streptococcus
• C. Chlamydomonas
• D. Plasmodium.

Answer 1

The Correct Option is B

The question is asking which among the given organisms lacks membrane-bound organelles. Let's look at each option to determine the correct answer:

1. Saccharomyces: This is a genus of fungi, which are eukaryotic organisms. Eukaryotes have cells with membrane-bound organelles, such as the nucleus and mitochondria.
2. Streptococcus: This is a genus of bacteria. Bacteria are prokaryotic organisms, which means they lack membrane-bound organelles. Their cellular structure is simpler and does not include structures like a nucleus, chloroplasts, or mitochondria.
3. Chlamydomonas: This is a genus of green algae, which are also eukaryotic. Like other eukaryotes, they contain membrane-bound organelles.
4. Plasmodium: This is a genus of parasitic protozoa. Protozoa are eukaryotic cells with membrane-bound organelles.

From this analysis, Streptococcus is the only organism among the options that lack membrane-bound organelles because it is a bacterium and thus a prokaryote. Therefore, the correct answer is:

Streptococcus

Let's summarize:

• Eukaryotes (e.g., Saccharomyces, Chlamydomonas, Plasmodium) have membrane-bound organelles.
• Prokaryotes (e.g., Streptococcus) do not have membrane-bound organelles.