DP Biology (last assessment 2024)

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Question 22M.2.HL.TZ2.2a.iii

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Date May 2022 Marks available [Maximum mark: 1] Reference code 22M.2.HL.TZ2.2a.iii
Level HL Paper 2 Time zone TZ2
Command term State Question number a.iii Adapted from N/A
a.iii.
[Maximum mark: 1]
22M.2.HL.TZ2.2a.iii

The onion (Allium cepa) root cells shown in the micrograph are in different stages of mitosis.

[Source: Reischig, J., 2014. Mitosis (261 13) [Pressed; root meristem of onion]. [image online] Available at https://commons.wikimedia.org/wiki/File:Mitosis_(261_13)_Pressed;_root_meristem_of_onion_(cells_in_prophase,_metaphase,_anaphase,_telophase).jpg   This file is licensed under the Creative Commons Attribution -ShareAlike 3.0 Unported (CC BY-SA 3.0) https://creativecommons.org/licenses/by-sa/3.0/deed.en [Accessed 3 December 2019].]

(a.iii)

State the role of cyclins in the cell cycle.

[1]

Markscheme
  1. (group of regulatory proteins that) control/regulate the cell cycle;
  2. activate cyclin-dependent kinases (which control cell cycle processes);

Syllabus sections