Zadanie 7, Paper 2, maj 2025, TZ3, Biologia IB SL
Wzorowane na: Biology SL Paper 2, May 2025, TZ3, pytanie 7. Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
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Zadanie
Polecenie
Biological function depends on coordinated structures and recurring processes.
(a) Outline how chromosome behaviour in mitosis produces genetically equivalent cells.
(b) Describe the production of mRNA in the nucleus.
(c) Explain how arterial and venous structures suit their transport roles.
One additional mark is available for clear, concise communication.
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Pokaż rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
(a)
Each chromosome has genetically identical sister chromatids OR DNA replication has produced equivalent copies. ✔
Chromosomes condense OR attach to spindle fibres OR align at the equator. ✔
Spindle microtubules shorten OR chromatids separate in anaphase. ✔
Chromatids reach opposite poles OR one copy of each enters each daughter cell. ✔
(b)
RNA polymerase opens the DNA helix or separates base-paired strands. ✔
One DNA template strand is used. ✔
Free RNA nucleotides are added. ✔
Complementary base pairing determines the sequence OR A pairs with U and G with C. ✔
RNA polymerase joins RNA nucleotides OR forms phosphodiester bonds between them. ✔
At termination, RNA or polymerase detaches OR the DNA strands re-form their helix. ✔
(c)
Arteries carry blood at higher pressure than veins. ✔
Relatively narrow arterial lumens help maintain pressure. ✔
Thick arterial walls withstand pressure OR collagen provides strength. ✔
Arterial smooth muscle withstands pressure or regulates diameter. ✔
Elastic fibres stretch and recoil OR help maintain pressure and smooth pulsatile flow. ✔
Venous valves prevent backflow. ✔
Flexible venous walls can be compressed by skeletal muscles OR this compression aids blood return. ✔
Wide venous lumens reduce flow resistance. ✔
A smooth endothelial lining reduces friction. ✔
Quality: the whole answer is clear on first reading, focused and concise. ✔
Schemat punktowania
Part(a):any4, max4; part(b):any4, max4; part(c):any7, max7. One holistic communication mark; total16.