Question

most neurons lack ________ and so are permanently blocked from undergoing cell division.

o a nucleus

o centrioles

o ribosomes

o cytoplasm

o endoplasmic reticula

Explanation:

Centrioles are crucial for cell division as they help in forming the spindle fibers. Neurons lack centrioles, which is why they cannot divide. A nucleus is present in neurons (it controls cell activities). Ribosomes (for protein synthesis), cytoplasm (cellular fluid), and endoplasmic reticula (involved in protein and lipid synthesis) are also present in neurons.

Answer:

centrioles