OCR A LEVEL BIOLOGY FINAL PAPER
2026 COMPLETE ANSWERS VERIFIED
●● During interphase. Answer: DNA replicated + checked. Protein
synthesis. Mitochondria grow + divide )in plant and algal cells).
Chloroplasts grow + divide. Normal metabolic processes occur
●● Mitotic phase. Answer: The period of cell division
●● Stages of cell division. Answer: 1. Mitosis 2. Cytokinesis
●● Mitosis. Answer: The nucleus divides
●● Cytokinesis. Answer: The cytoplasm divides and two cells are
produced
●● Stages of interphase. Answer: G1 = 1st growth = proteins are
synthesised, organelles replicate = cell increases in size.
S = synthesis = DNA replicates
G2 = 2nd growth = cell grows more, energy stores increase, duplicated
DNA is checked for errors
, ●● G 0. Answer: The phase when the cell leaves the cycle, either
temporarily or permanently.
●● Differentiation. Answer: A cell that becomes specialised to carry out
a particular function is no longer able to divide. It will carry out the
function indefinitely and not enter the cell cycle
●● Why might a cell leave a cycle (temporarily or permanently).
Answer: Differentiation, damaged DNA = cell arrest, get older = more
cells
●● How is the cell cycle controlled?. Answer: Checkpoints = monitor
and verify whether each stage has been accurately completed before the
cell goes in to the next phase.
●● Checkpoints. Answer: Monitor and verify whether each stage has
been accurately completed before the cell goes in to the next phase. G1,
G2 and metaphase checkpoints
●● G1 checkpoint. Answer: After the G1 phase, before the S phase.
If the requirements are met then the checkpoint triggers the DNA
replication, if not it enters resting state
2026 COMPLETE ANSWERS VERIFIED
●● During interphase. Answer: DNA replicated + checked. Protein
synthesis. Mitochondria grow + divide )in plant and algal cells).
Chloroplasts grow + divide. Normal metabolic processes occur
●● Mitotic phase. Answer: The period of cell division
●● Stages of cell division. Answer: 1. Mitosis 2. Cytokinesis
●● Mitosis. Answer: The nucleus divides
●● Cytokinesis. Answer: The cytoplasm divides and two cells are
produced
●● Stages of interphase. Answer: G1 = 1st growth = proteins are
synthesised, organelles replicate = cell increases in size.
S = synthesis = DNA replicates
G2 = 2nd growth = cell grows more, energy stores increase, duplicated
DNA is checked for errors
, ●● G 0. Answer: The phase when the cell leaves the cycle, either
temporarily or permanently.
●● Differentiation. Answer: A cell that becomes specialised to carry out
a particular function is no longer able to divide. It will carry out the
function indefinitely and not enter the cell cycle
●● Why might a cell leave a cycle (temporarily or permanently).
Answer: Differentiation, damaged DNA = cell arrest, get older = more
cells
●● How is the cell cycle controlled?. Answer: Checkpoints = monitor
and verify whether each stage has been accurately completed before the
cell goes in to the next phase.
●● Checkpoints. Answer: Monitor and verify whether each stage has
been accurately completed before the cell goes in to the next phase. G1,
G2 and metaphase checkpoints
●● G1 checkpoint. Answer: After the G1 phase, before the S phase.
If the requirements are met then the checkpoint triggers the DNA
replication, if not it enters resting state
