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Cell Biology

Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.

Introduction to cells

Subtopic

Introduction to cells under Cell Biology for Grade 12 IB.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    Which statement best describes the 'cell theory'?

    A.

    It is a proven law that applies to every single entity in the universe

    B.

    It is a fundamental concept in biology describing the properties of cells

    C.

    It is a theory that only applies to plants

    D.

    It is an outdated idea replaced by the DNA theory

  2. 2.

    In the 'MR H GREN' mnemonic for functions of life, what does 'H' stand for?

    A.

    Heredity

    B.

    Habitat

    C.

    Homeostasis

    D.

    History

  3. 3.

    Convert 0.5 mm0.5\ mm to micrometers (μm\mu m).

    A.

    5 μm5\ \mu m

    B.

    50 μm50\ \mu m

    C.

    500 μm500\ \mu m

    D.

    5000 μm5000\ \mu m

Download the worksheet for Cell Biology - Introduction to cells to practice offline. It includes additional chapter-level practice questions.

Ultrastructure of cells

Subtopic

Ultrastructure of cells under Cell Biology for Grade 12 IB.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    What is the primary function of the capsule found in some pathogenic bacteria?

    A.

    Protein synthesis

    B.

    Protection from the host's immune system

    C.

    Facilitating cell division

    D.

    Energy production

  2. 2.

    Which organelle usually occupies the largest volume in a mature plant cell?

    A.

    Central vacuole

    B.

    Nucleus

    C.

    Chloroplast

    D.

    Mitochondria

  3. 3.

    Which bacterial structure is specifically used for the exchange of genetic material during conjugation?

    A.

    Flagella

    B.

    Capsule

    C.

    Cell wall

    D.

    Pili

Download the worksheet for Cell Biology - Ultrastructure of cells to practice offline. It includes additional chapter-level practice questions.

Membrane structure

Subtopic

Membrane structure under Cell Biology for Grade 12 IB.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    Which of the following best describes the 'bilayer'?

    A.

    One single layer of phospholipids

    B.

    Two layers of phospholipids with tails pointing inward

    C.

    A sandwich of protein between two lipid layers

    D.

    Three layers of cholesterol

  2. 2.

    What is the typical thickness of a biological membrane?

    A.

    1-2 nm

    B.

    10 nm

    C.

    100 nm

    D.

    1000 nm

  3. 3.

    Which of the following is a function of membrane-bound enzymes?

    A.

    Transporting oxygen in the blood

    B.

    Catalyzing specific metabolic pathways at the cell surface

    C.

    Storing calcium ions

    D.

    Forming the cell wall

Download the worksheet for Cell Biology - Membrane structure to practice offline. It includes additional chapter-level practice questions.

Membrane transport

Subtopic

Membrane transport under Cell Biology for Grade 12 IB.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    Which of the following best describes the arrangement of phospholipids in the plasma membrane?

    A.

    Tails face the water outside, heads face each other

    B.

    Heads face the water inside, tails face the water outside

    C.

    Tails and heads are randomly distributed

    D.

    Heads face the aqueous environments, tails face inward

  2. 2.

    Small non-polar molecules like nitrogen (N2N_2) cross the membrane primarily via:

    A.

    Active transport

    B.

    Simple diffusion

    C.

    Facilitated diffusion

    D.

    Endocytosis

  3. 3.

    What specific molecule is required to provide the energy for the sodium-potassium pump to change its shape?

    A.

    Glucose

    B.

    Oxygen

    C.

    ATP

    D.

    Water

Download the worksheet for Cell Biology - Membrane transport to practice offline. It includes additional chapter-level practice questions.

The origin of cells

Subtopic

The origin of cells under Cell Biology for Grade 12 IB.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    Which of the following best describes the environment of the 'primordial soup'?

    A.

    An ocean rich in organic compounds

    B.

    A dry desert with no water

    C.

    A frozen tundra of ice

    D.

    An atmosphere made entirely of oxygen

  2. 2.

    What is the primary role of catalysts in the chemical evolution of life?

    A.

    To slow down the destruction of RNA

    B.

    To increase the rate of chemical reactions that form polymers

    C.

    To prevent the formation of cell membranes

    D.

    To provide the genetic code for the first cell

  3. 3.

    Which of the following is a component of the cell that is NOT explained by the endosymbiotic theory?

    A.

    Mitochondria

    B.

    Chloroplasts

    C.

    Cytoplasm

    D.

    Double membranes of organelles

Download the worksheet for Cell Biology - The origin of cells to practice offline. It includes additional chapter-level practice questions.

Cell division

Subtopic

Cell division under Cell Biology for Grade 12 IB.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    Which stage of the cell cycle follows immediately after the G1G_1 phase?

    A.

    Mitosis

    B.

    S phase

    C.

    G2G_2 phase

    D.

    Cytokinesis

  2. 2.

    What is the process of DNA condensing into tightly packed structures before division called?

    A.

    Translation

    B.

    Supercoiling

    C.

    Replication

    D.

    Elongation

  3. 3.

    In which phase of the cell cycle is the cell most metabolically active, performing protein synthesis?

    A.

    Prophase

    B.

    Anaphase

    C.

    Interphase

    D.

    Mitosis

Download the worksheet for Cell Biology - Cell division to practice offline. It includes additional chapter-level practice questions.