Which of the following cell organelles is not present in animal cells?AlysosomeBcell wallCsmooth endoplasmic reticulumDnucleus

To determine which of the listed cell organelles is not present in animal cells, we'll analyze each option given:

1. Lysosome: This organelle is present in animal cells and is involved in digestion and waste removal.

2. Cell Wall: The cell wall is found in plant cells, fungi, and some bacteria, but it is not present in animal cells.

3. Smooth Endoplasmic Reticulum: This organelle is also present in animal cells and plays a role in lipid synthesis and detoxification.

4. Nucleus: The nucleus is a critical organelle in animal cells that contains the cell's genetic material and regulates gene expression.

Final Answer

The correct answer is B: cell wall.