3. Enzymes
A section of Biology, 9700
Listing 10 of 276 questions
shows the structure of the enzyme lysozyme. s s s s s s s s Lys Trp Trp Trp Val Gly Gly Gly Gly Gly Gly Gly Gly Gly Gly Gly Gly Arg Cys Glu Leu Ala Ala Ala Ala Ala Ala Gln Gln Ile Ile Ile Ile Pro Pro Ile Ile Gln Ala Ala Ala Ala Ala Ala Leu Asp Asn Tyr Tyr Ser Ser Ser Ser Ser Ser Ser Ser Ser Ser Tyr Asn Asn Asn Thr Thr Thr Thr Thr Thr Asn Asn Asn Asn Asn Asn Asn Asn Asn Asp Asp Thr Asp Asp Asp Asp Asp Leu Leu Leu Leu Leu Leu Glu Cys Cys Cys Cys Cys Cys Cys Arg His Arg Arg Arg Trp Trp Trp Arg Arg Arg Arg Arg Arg Phe Phe Phe Val Val Val Val Val Lys Met Met Lys Lys Lys Lys Name the two types of covalent bond in the structure in . The primary structure of lysozyme is shown in . Explain the meaning of the term primary structure. Lysozyme hydrolyses the β-1,4 glycosidic bonds present in compounds found in bacterial cell walls. State what is meant by the term hydrolysis. Suggest the type of biological molecule which is the substrate for lysozyme. Lysozyme uses the induced fit mechanism. Explain the mode of action of an enzyme that uses the induced fit mechanism. In human tears and saliva, lysozyme acts as an extracellular enzyme. State what is meant by the term extracellular. shows the results of an investigation into the effect of substrate concentration on the rate of reaction catalysed by lysozyme. substrate concentration / mmol rate of reaction / μmol min–1 Use to: state the lowest substrate concentration to give the maximum rate of reaction, Vmax determine the Michaelis-Menten constant, Km. Km = The investigation was repeated in the presence of a competitive inhibitor of lysozyme. Draw a curve on to show the expected results.
9700_w16_qp_21
THEORY
2016
Paper 2, Variant 1
View
Questions Discovered
276