AS Biology Notes #1

Paper 2 questions

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Last updated: July 17, 2025

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Hint	Answer
Role of the endodermis tissue	Stops water moving through the apoplast
	Water moves from cell wall to cytoplasm
	Allows control of substances into root
	Casparian strip (suberin)
Advantage of reaction occurring in SER rather than cytoplasm	SER can provide substrate
	SER involved in lipid transport
	Product can be transported from/stored in SER
	Compartmentalisation: separated from other reactions in cytoplasm
How modifying the R-group of an amino acid in an enzyme reduces the catalytic activity of the enzyme	Effect on ionic/H-bonding/hydrophobic interactions with other R-groups
	Changes the shape of the active site
	Active site is no longer complementary to the substrate
	Activation energy not reduced
	ESC not formed
Process of cell signalling that leads to a response	Ligands are secreted by cells
	Ligands are transported to target cells
	Ligands bind to receptors on target CSMs
	Activation of secondary messenger \| Enzyme activation \| Signal transduction

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