Which of the following characteristics of bacteria is not true?
**Core Concept**
Bacteria are single-celled microorganisms that exhibit various characteristics, including their cell wall structure, metabolic processes, and genetic makeup. The cell wall of bacteria is primarily composed of peptidoglycan, which provides structural support and maintains the osmotic balance within the cell.
**Why the Correct Answer is Right**
The correct answer is related to the cell wall structure of bacteria, which is a critical aspect of their physiology. The cell wall is responsible for maintaining the cell's shape, preventing lysis due to osmotic pressure, and facilitating the transport of nutrients and waste products. The correct answer highlights a characteristic that is not true about bacteria, which will be explained in the following sections.
**Why Each Wrong Option is Incorrect**
**Option A:** Bacteria are prokaryotic cells that lack a true nucleus and other membrane-bound organelles.
* This statement is true about bacteria, as they are prokaryotic cells that lack a true nucleus and other membrane-bound organelles.
**Option B:** Bacteria have a cell wall composed of peptidoglycan.
* This statement is true about bacteria, as their cell wall is primarily composed of peptidoglycan, which provides structural support and maintains the osmotic balance within the cell.
**Option C:** Bacteria are capable of photosynthesis.
* This statement is not true about bacteria, as they are not capable of photosynthesis. Photosynthesis is a process that occurs in plants, algae, and some bacteria (cyanobacteria), which involves the conversion of light energy into chemical energy.
**Option D:** Bacteria are eukaryotic cells that have a true nucleus.
* This statement is not true about bacteria, as they are prokaryotic cells that lack a true nucleus and other membrane-bound organelles.
**Clinical Pearl / High-Yield Fact**
Bacteria can be classified into two main groups based on their cell wall structure: Gram-positive and Gram-negative. The Gram staining technique is a widely used method for differentiating between these two groups, which is essential for the diagnosis and treatment of bacterial infections.
**Correct Answer: C. Bacteria are capable of photosynthesis.