You have isolated a motile, gram-positive cell with no visible nucleus. You can assume this cell has
a. Ribosomes.
b. Mitochondria.
c. An endoplasmic reticulum.
d. A Golgi complex.
e. All of the above

Verified step by step guidance

Step 1: Identify the type of cell based on the given characteristics: motile, gram-positive, and no visible nucleus. These features suggest the cell is a prokaryote, specifically a bacterium, because prokaryotes lack a true nucleus and gram-positive refers to a bacterial staining characteristic.

Step 2: Recall the cellular structures present in prokaryotic cells. Prokaryotes have ribosomes, which are essential for protein synthesis, but they do not have membrane-bound organelles such as mitochondria, endoplasmic reticulum, or Golgi complex.

Step 3: Understand that mitochondria, endoplasmic reticulum, and Golgi complex are membrane-bound organelles found only in eukaryotic cells, not in prokaryotes like bacteria.

Step 4: Conclude that since the cell is gram-positive and lacks a nucleus, it must have ribosomes but not mitochondria, endoplasmic reticulum, or Golgi complex.

Step 5: Therefore, the correct assumption about this cell is that it has ribosomes (option a), but not the other organelles listed.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Gram-Positive Bacterial Cell Structure

Gram-positive bacteria have a thick peptidoglycan cell wall and lack a nucleus, classifying them as prokaryotes. Their cellular components differ from eukaryotes, notably lacking membrane-bound organelles such as mitochondria, endoplasmic reticulum, and Golgi complex.

Prokaryotic vs. Eukaryotic Organelles

Prokaryotic cells, like bacteria, do not contain membrane-bound organelles such as mitochondria, endoplasmic reticulum, or Golgi apparatus. Instead, they have ribosomes for protein synthesis, which are smaller but functionally similar to those in eukaryotes.

Ribosomes in Prokaryotes

Ribosomes are essential cellular structures responsible for protein synthesis and are present in all living cells, including prokaryotes. In bacteria, ribosomes are free-floating in the cytoplasm and are critical for translating genetic information into proteins.

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