IBO Theoretical Exam Part A 2024 Biology Questions

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All IBO examination questions are published under the following Creative Commons license:
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CC BY-NC-SA (Attribution-NonCommercial-ShareAlike) -
https://creativecommons.org/licenses/by-nc-sa/4.0/
The exam papers can be used freely for educational purposes as long as IBO is credited and
new creations are licensed under identical terms. No commercial use is allowed.

Theoretical Exam - Part A G0-1
English (Ocial)
General Instructions for Theory Part A
Date: July 11th, 2024
Time Allowed: 3 hours and 15 minutes (NO additional time)
The Theory Part A exam consists of 50 tasks across the following topics:
•Biosystematics: Q1-3
•Cell and Molecular Biology: Q4-12
•Ecology: Q13-17
•Ethology: Q18-19
•Genetics & Evolution: Q20-29
•Plant Anatomy and Physiology: Q30-37
•Animal Anatomy and Physiology: Q38-50
Supplementary gures are provided in the Appendix.
Each question is worth a maximum of 1.0 point. Marking is done based on the scheme below:
Number of correctly identied
statements
01234
Points 0 0 0.2 0.6 1
Please keep in mind:
Instructions
You can use the question paper for your notes and rough work, we do not assess it.
An answer sheet is provided. Only answers recorded on the answer sheet will be scored. The sheet
includes several elds that need to be lled out. Follow the instructions below for lling out the answer
sheet:
In the "Last and First Name" eld, write your last name (family name) and rst name in English (if
both do not t, write only your last name).
In the "Country or Territory" eld, write the country or territory you represent at the IBO in En-
glish.
In the "ID№" eld, rst enter the three digits of your personal ID number in the leftmost column
(from top to bottom), then shade the corresponding digit in the row to the right of each digit of
the ID number.
The largest eld, "Answers," contains 50 questions, each with four statements labelled A, B, C, and
D. Each statement has two squares: the "T" square indicates true, and the "F" square indicates
false.
Ensure that the squares in the "ID№" and "Answers" elds are completely shaded with no un-
shaded areas remaining and without going outside the boundaries. Marks like "+", "x", check-
marks, or circles will not be read. Black squares must be shaded with a black pen (using a red pen
or pencil is strictly prohibited).

Theoretical Exam - Part A G0-2
English (Ocial)
Do NOT ll out the "charge person" eld and do NOT shade any elds that are not specied above.
Black squares in the corners SHOULD NOT be shaded/corrected as it will interfere with the scan-
ning process.
Communication with Organizers
You are provided with four types of cards for assistance during the exam:
•Drinking Water (Blue): Raise this card if you need water.
•Washroom (Yellow): Raise this card if you need to use the washroom.
•Correction (White): Raise this card if you made a mistake on your answer sheet and want to x it.
•Other Queries (Red): Raise this card if you have any other questions.
If you make a mistake on your answer sheet, use the "Correction (White)" card to request a correction
pen. Using the correction pen, recolor the wrongly shaded area into white without going outside the
boundaries. You cannot ask for correction in the last 10 minutes. (Note: Overuse of the correction
pen may cause scanning errors, try to put in the answers once you are fully condent)
Drinking water Washroom Correction Other queries
During the Exam
At the beginning of the exam, a whistle signal will let you know to open the exam papers and start writing.
15 minutes before the end, please start lling out the answer sheet if you have not already. We do not
provide extra time to put your answers on the answer sheet.
At the end of the exam, a whistle signal will indicate when to stop writing and put down your pen imme-
diately.
Continuing to write after the whistle signal will result in disqualication.
No materials, papers, or equipment should be taken out of the examination room.

Theoretical Exam - Part A G8-1
English (Ocial)
Appendix
Amino acid structures with abbreviations:G-glycine, A-alanine, S-Serine, T-Threonine, C- Cysteine, V
-Valine, L-Leucine, I- Isoleucine, M- Methionine, P- Proline, F- Phenylalanine, Y- Tyrosine, W- Tryptophan,
D- Aspartic acid, E- Glutamic acid, N- Asparagine, Q-Glutamine, H- Histidine, K- Lysine, R- Arginine

Theoretical Exam - Part A G8-2
English (Ocial)
Codon table for Amino acids:
First letter
Third letter
Second letter