Question

unit 1 cumulative test (characteristics of life, biomolecules, cell struc
16 of 42
which organelle that is necessary for mitosis is not found in neurons (nerve cells)?
○ nucleus
○ centrioles
○ cell membrane
○ dendrites

Explanation:

To solve this, we analyze each option:

• Ribosomes: Involved in protein synthesis (needed for mitosis - e.g., making proteins for cell division machinery). Present in neurons.
• Centrioles: Essential for mitotic spindle formation during cell division (mitosis). Neurons are post - mitotic (don't undergo mitosis), so centrioles are not found in them.
• Cell membrane: All cells (including neurons) have a cell membrane, crucial for cell structure and transport, and not directly related to the mitosis - absence in non - dividing cells logic here.
• Dendrites: Part of neuron structure for signal reception, not related to mitosis machinery presence/absence.

Answer:

The organelle necessary for mitosis not found in neurons is centrioles (the option with "centrioles" as the text, depending on the option label; assuming the option with centrioles is the correct one among the given choices).