Which of the following are two key characteristics of simple columnar epithelium?

• A. Cells are flat and arranged in multiple layers
• B. Cells are tall and arranged in a single layer
• C. Cells are irregularly shaped and lack a basement membrane
• D. Cells are cube-shaped and have multiple nuclei

Answer: (B)

Verified step by step guidance

1. Understand the structure and function of simple columnar epithelium: Simple columnar epithelium consists of tall, column-like cells arranged in a single layer. These cells are specialized for absorption and secretion, commonly found in the digestive tract lining.
2. Eliminate incorrect options based on the characteristics of simple columnar epithelium: Cells are not flat (as in squamous epithelium), nor are they arranged in multiple layers (as in stratified epithelium). Therefore, the first option is incorrect.
3. Evaluate the second option: 'Cells are tall and arranged in a single layer.' This matches the description of simple columnar epithelium, as the cells are elongated and form a single layer.
4. Analyze the third option: 'Cells are irregularly shaped and lack a basement membrane.' This is incorrect because all epithelial tissues, including simple columnar epithelium, have a basement membrane that anchors the cells.
5. Review the fourth option: 'Cells are cube-shaped and have multiple nuclei.' This describes cuboidal epithelium, not columnar epithelium. Simple columnar epithelium cells are tall and typically have a single nucleus located near the base of the cell.