Zadanie 6, Paper 2, maj 2023, TZ1, Biologia IB SL
Wzorowane na: Biology SL Paper 2, May 2023, TZ1, pytanie 6. Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
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Zadanie
Polecenie
(a) Outline the events of mitosis in their normal sequence.
(b) Describe processes taking place in the nucleus of a eukaryotic cell during interphase, the period between nuclear divisions.
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Pokaż rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
(a)
Chromosomes condense. ✔
The nuclear envelope breaks down. ✔
Spindle microtubules form. ✔
Spindle microtubules attach to chromosomes at centromeric regions. ✔
Chromosomes align at the equator. ✔
Centromeric cohesion is released to permit separation. ✔
Sister chromatids separate OR move towards opposite poles. ✔
Nuclear envelopes form around the chromosome groups at the poles. ✔
(b)
DNA is replicated. ✔
The double helix is unwound OR supercoiled DNA is relaxed. ✔
Hydrogen bonds are broken OR the DNA strands separate. ✔
New DNA strands are synthesized. ✔
Replication is semiconservative OR an old strand acts as a template OR leading-strand synthesis is continuous whereas lagging-strand synthesis is discontinuous. ✔
Complementary base pairing determines the copied sequence during replication and transcription. ✔
Genes are transcribed. ✔
RNA is synthesized. ✔
A selected gene sequence, rather than the whole genome, is copied into a transcript. ✔
Introns can be removed from a primary RNA transcript. ✔
RNA leaves the nucleus for the cytoplasm. ✔
Quality of communication: The whole response is clear and concise, with little repetition or irrelevant material. ✔
Schemat punktowania
Part (a): Award any 5 of the listed points; maximum 5 marks. Any 5 distinct events in a biologically valid sequence, maximum 5. If the order is incorrect, cap at 4. A list only of phase names in order earns at most 1. Phase names are not otherwise required. Part (b): Award any 7 of the listed points; maximum 7 marks. Any 7 distinct valid points, maximum 7. The required total can be achieved entirely from SL replication and transcription knowledge; optional correct additional details are acceptable but not demanded. Award 1 independent mark for clarity and concision across the whole retained response. Maximum 13 marks.