Genes have a role in determining the overall phenotype of an organism. Dwarf plants also occur if the genes controlling growth are not activated (switched on). Explain how DELLA proteins act as repressors preventing gene expression. ............................................................................................................................................... . ............................................................................................................................................... . ............................................................................................................................................... . ............................................................................................................................................... . ............................................................................................................................................... . ............................................................................................................................................... . .........................................................................................................................................

Biology

IGCSE&ALevel

CAIE

Exam No：9700_s24_qp_42 Year：2024 Question No：4(c)

Answer:

Knowledge points:

16.3.1 describe the differences between structural genes and regulatory genes and the differences between repressible enzymes and inducible enzymes

16.3.2 explain genetic control of protein production in a prokaryote using the lac operon (knowledge of the role of cAMP is not expected)

16.3.3 state that transcription factors are proteins that bind to DNA and are involved in the control of gene expression in eukaryotes by decreasing or increasing the rate of transcription

16.3.4 explain how gibberellin activates genes by causing the breakdown of DELLA protein repressors, which normally inhibit factors that promote transcription

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Knowledge points:

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