Biology > EXAM > OCR Paper 3 OCR Unified Biology specific revision 2024 questions and answers Rated A+ (All)
OCR Paper 3 OCR Unified Biology specific revision 2024 questions and answers Rated A+
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Difference between excretion and secretion - correct answers Excretion is the removal of toxic, metabolic waste while Secretion is the release of substances by cells chi-square test - correct answe... rs - degrees of freedom = n-1 (no. categories-1) - p = 0.05 - how reliable/significant - how likely it is to happen - how "lucky" is the experiment data If the value in the table is smaller than the X^2 value, significant difference between O and E - X^2 value = bigger, reject nul hypotheiss genetic engineering process in stages - correct answers 1) Obtain required gene 2) Copy of gene is placed in Vector 3) Vector carries Gene into recipient cell 4) Recipient expresses new gene Methods of aiding DNA to cross recipient cell membrane: Heat Shock - correct answers Heat Shock: - 0 degress to 42 degrees - calcium chloride --> walls and membranes become more porous --> Ca+ ions surround negative DNA + negative phospholipids in membrane, reducing repulsion [Show More]
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