ACT Science Practice Question #1515 (Medium (32)) | Test Citadel
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ACT Science Difficulty: Medium (32)

Digital ACT Science Practice Question #1515

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Onion root tip cells were treated with colchicine (which arrests cells in metaphase): - Control: 8% of cells in metaphase - 0.01% Colchicine: 24% of cells in metaphase - 0.05% Colchicine: 58% of cells in metaphase Colchicine increases the percentage of cells in metaphase by:
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Colchicine blocks spindle fibers -> cells trapped in metaphase.

Masterclass Solution & Distractor Trap Analysis

Colchicine inhibits spindle microtubule polymerization, preventing chromosomes from separating into anaphase, trapping cells in metaphase....

Distractor Analysis: Trap choice eliminates careless test-takers who confuse roots with coordinates...

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