Umiejętności z tego działu sprawdza 17 zadań wzorowanych na arkuszach IB z lat 2022–2026. Dział pojawia się w 14 z 57 arkuszy w bazie.
In a hypothetical exposure, a radioactive iodine isotope accumulates in thyroid cells. (i) Deduce how its radiation could initiate cancer. (ii) Predict, with a reason, whether the resulting thyroid-cell mutation would be transmitted to the person’s children.
Describe two kinds of DNA sequence mutation.
The same DNA region is sequenced before and after replication. Original: ACGTCCATGATC Replicated: ACGTTCATGATC Which change is present? A. One base has been replaced while sequence length stays constant B. One extra triplet has been inserted C. One nucleotide…
One DNA coding-strand triplet changes from 5′-TCT-3′ to 5′-TGT-3′. All other triplets remain unchanged. Use the supplied coding-strand table. What follows from this substitution? A. Every later triplet is shifted by one base B. The encoded chain loses exactly…
Compare and contrast substitution and insertion mutations.
Which statement correctly describes mutation with respect to an organism’s adaptive needs? A. Mutations always arise because the organism needs a particular trait B. Mutations occur only in reproductive cells C. Mutations are not directed towards producing the…
Identify one DNA mutation type that UV exposure can cause.
Suggest why the dark control and UV-only control have different colony counts.
Suggest why the two sunscreen treatments differ.
In which cell could a new mutation be transmitted directly to a child through fertilization? A. A sperm cell B. A liver cell C. A mature skin cell D. A pancreatic beta cell
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