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IBBiologyHLExam QuestionsForm & FunctionOrganelles & Compartmentalisation

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First teaching 2023

First exams 2025

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Organelles & Compartmentalisation (HL IB Biology)

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Organelles & Compartmentalisation

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Organelles & Compartmentalisation

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1
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Which of the following are not considered organelles?

  • Vesicles

  • Plasma membrane

  • Cell wall

  • Ribosomes

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2
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Which of the following describe how the mitochondria are adapted for the production of ATP by aerobic cell respiration?

I. Large surface area of cristae.

II. Mitochondria have a double membrane with a large volume of intermembrane space.

III. Compartmentalisation of enzymes and substrates of the Krebs cycle in the matrix.

  • I and II only

  • II and III only

  • I and III only

  • I only

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3
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What is an advantage of the separation of the nucleus and cytoplasm into separate compartments in eukaryotes?

  • Post-transcriptional modification of mRNA can happen before the mRNA meets ribosomes in the cytoplasm.

  • Post-transcriptional modification of mRNA can happen after the mRNA meets ribosomes in the cytoplasm.

  • Post-transcriptional modification of mRNA happens immediately upon arrival at ribosomes.

  • Post-transcriptional modification of mRNA can occur in the cytoplasm.

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1
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Which of the following is true of ribosomes?

  • Proteins for transport are synthesised by free ribosomes. 

  • Ribosomes consist of a large and a small subunit composed of protein and transfer RNA (tRNA).

  • Ribosomes exist in the cells of all living organisms.

  • Ribosomes on the rough endoplasmic reticulum synthesise proteins for retention within the cell.

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2
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Vesicles are membrane-bound sacs used for transport and storage. Clathrins are proteins that help with the formation of vesicles.

What is the correct order of events for vesicle formation?

  Step 1 Step 2 Step 3 Step 4
A A clathrin coated pit is formed on the surface of the cell membrane Cytoskeleton proteins help the clathrin pit to deepen and eventually seal off, trapping the target molecules inside Receptor proteins on the cell surface bind to the target molecules

A vesicle is now formed
B

A clathrin coated pit is formed on the surface of the cell membrane

Receptor proteins on the cell surface bind to the target molecules

Cytoskeleton proteins help the clathrin pit to deepen and eventually seal off, trapping the target molecules inside

A vesicle is now formed
C Receptor proteins on the cell surface bind to the target molecules A clathrin coated pit is formed on the surface of the cell membrane Cytoskeleton proteins help the clathrin pit to deepen and eventually seal off, trapping the target molecules inside A vesicle is now formed
D Receptor proteins on the cell surface bind to the target molecules Cytoskeleton proteins help the clathrin pit to deepen and eventually seal off, trapping the target molecules inside A clathrin coated pit is formed on the surface of the cell membrane A vesicle is now formed

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    3
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    The chloroplast is adapted for photosynthesis. 

    Which of the following is not an adaptation of the chloroplast for photosynthesis?

    • A large surface area of thylakoid membranes with photosystems.

    • A large volume of fluid inside thylakoids.

    • Compartmentalisation of enzymes and substrates of the Calvin cycle in the stroma.

    • Chloroplast DNA that contains genes which code for some of the proteins and enzymes used in photosynthesis.

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