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Chapter 29 1. The characteristic features of a cell are controlled by its (1)_______________. 2. To prevent (2)_______________ being wasted, some genes can be switched on and off as required. 3. The operon (Jacob-Monod) hypothesis states that a structural gene remains switched off while its (3)_______________ gene is combined with a (4)_______________ from a regulator gene. The structural gene becomes switched on and codes for its protein when an (5)_______________ prevents the repressor combining with the operator gene. 4. All the chemical processes that occur in a living organism are known collectively as its (6)_______________. 5. Each stage in a metabolic (7)_______________ is controlled by an enzyme. 6. Production of each (8)_______________ is controlled by a particular gene (or group of genes). 7. A (9)_______________ gene is unable to code the information needed to produce its enzyme. Lack of this enzyme may lead to an inborn (10)_______________ of metabolism such as (11)_______________. G R Davidson Page 1 of 2 Chapter 29 8. During (12)_______________ cells become specialised to perform specific (13)_______________. differentiation enzyme error functions genes inducer metabolism mutated operator pathway PKU repressor resources ----------Word Bank---------- G R Davidson Page 2 of 2