The Cell Cycle (OCR A-Level Biology A): Flashcards
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Cell cycle definition
Cell cycle definition
Repeating pattern of division, growth, maturation, division
Which specialised cells cannot divide?
Which specialised cells cannot divide?
Muscle cells, nerve cells, mammalian red blood cells
% of cell cycle spent in interphase
% of cell cycle spent in interphase
95%
What happens in G₁ phase?
What happens in G₁ phase?
Protein synthesis, organelle production, cell growth
What is replicated in S phase?
What is replicated in S phase?
DNA - producing two identical sister chromatids
What proteins are made in G₂ phase?
What proteins are made in G₂ phase?
Proteins for chromosome condensation & spindle formation
% of cell cycle spent in M phase
% of cell cycle spent in M phase
5%
Cytokinesis in animal vs plant cells
Cytokinesis in animal vs plant cells
Animal: cleavage furrow; Plant: cell plate
What does G₁ checkpoint examine?
What does G₁ checkpoint examine?
Chromosomes for damage
What does metaphase checkpoint verify?
What does metaphase checkpoint verify?
All chromosomes attached to spindle fibres