Umiejętności z tego działu sprawdzają 44 zadania wzorowane na arkuszach IB z lat 2022–2026. Dział pojawia się w 28 z 54 arkuszy w bazie.
A pancreatic secretory cell contains the structures labelled Y in the schematic. (i) Distinguish between Y and the corresponding structures inside a mitochondrion. (ii) State one other organelle involved in exporting the proteins produced at Y.
Explain how you would prepare a temporary mount of a thin leek leaf epidermal peel and obtain a clear view of its cells with a light microscope.
Calculate the magnification of this cell drawing using its scale bar and the aligned millimetre ruler.
Explain how features of the organelle represented by Y support the theory of endosymbiosis.
(i) Distinguish the structure of a green leaf cell from that of a typical fungal cell. (ii) Distinguish a plant nuclear chromosome from a typical bacterial chromosome.
A student prepares stained squash mounts from a young garlic root to examine cell division. (i) Outline why a stain is used. (ii) Describe how to calculate a reliable mitotic index for the tissue.
Compare and contrast the organelles of a ciliated mammalian airway epithelial cell and a budding yeast cell.
A cell drawing shows a nucleus whose actual diameter PQ is 6.0 μm. Use the millimetre ruler aligned with the drawing to measure PQ. What is the magnification? A. 30× B. 300× C. 3000× D. 30 000×
A researcher freezes a cell sample and splits membranes before electron imaging. Which feature is this technique particularly useful for examining? A. The nucleotide sequence of a chromosome B. The distribution of structures embedded within the lipid bilayer…
Descendants of a single-celled alga remain attached after division and form a coordinated multicellular body. Consider these claims. I. Division of labour can develop between its cells. II. The body can be larger than one cell. III. The cells must now belong…
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