By G. W. Stout, N. P. O. Green (auth.)
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C reaction rate satu ration of active sites substrate concentration For a given enzyme concentration the rate of an enzyme-mediated reaction increases with increasing substrate concentration in a linear fashion. Above a certain substrate concentration the rate of reaction becomes constant. This is because at this point all the active sites, at any moment, are fully saturated with substrate. Further substrate reactivity must await dissociation of the enzyme-substrate complex. Substrate concentration can therefore limit reaction rate.
Chemicals of life f Name three types ofRNA involved in protein synthesis. ii .......... ~r .. 6 .. t:1§f~r.. NA .. NA) . . 7 The diagram shows part of a polynucleotide chain. (a-) a On the diagram draw a line round one nucleotide. b What are the chemical groups labelled A, B, C? §~ . ~.. g~r . ~~~ . c c Which compound pairs with thymine in the DNA molecule? ~ . d How are the bases on the two adjacent strands of the DNA molecule held together? g . 8 For each of the following formulae give (i) the name of the substance represented and (ii) the biochemical class to which it belongs.
4 Ciliated: columnar cells with cilia at their free surface. Contain secretory goblet cells. g. 9(b)(ii)). ii Compound Epithelia (More Than One Layer Thick) Stratified: Cells near basement membrane are cubical or columnar. As they are pushed outwards they become flattened squames and protect underlying tissues from mechanical damage. g. vagina and external skin surfaces. iii Glandular Tissue Exocrine glands secrete their products into ducts. Endocrine glands pass secretions directly into the bloodstream and may be alternatively called ductless glands.