Biology Fsc Part 1 Online Test With Answers

Biology Fsc Part 1 Online Test

Sr. # Questions Answers Choice
1 Substrate molecule fits into binding site by wek chemical forces such as. Covalent bond Metalic Bond Ionic Bond Hydrogen bond
2 Small cleft or depression is the sourface of globular enzyme is. Active site Synaptic cleft T tubule No such cleft exists
3 Enzmes are .................globular proteins. 2 D 3 D 4 D Both a and c
4 The enzyms of Calvin cycle and Krebs's cycle. Present in karyoplasm Dispersed in cytoplasm Bound to memebranes of their organelles Presnet in periplasmic space
5 The enxymes of glycolysis are present in  Nucleoplasm Cytoplasm Stroma Mitochondrial matrix
6 All enzymes are syntheesized inside cell by  Ribosomes Lysosomes Mitochondria Vacuoles
7 Rae of enzyme catalyzed reactions are ............times greater than uncatalyzed rection rate. 10<sup>3</sup> to 10<sup>8</sup> 10<sup>2</sup> to 10<sup>3</sup> 10<sup>6</sup> to 10<sup>11</sup> 10<sup>8</sup> to 10<sup>10</sup>
8 Enxymes speed up chemical reactions by lowering. Ionization energy Activation energy Hydration energy  Bond energy
9 Which enxyme class is responsible for catalysing the addition of water to a substrate molecule. Isomerase Lyase Hydrolase Ligase
10 How does a non competitive inhibitor decrease the rae ofn enzyme catalysed reaction. By chaing the free energy change of the reaction  By acting as a coenzyme for the reaction  By changing the shape of the enxyme By binding the active site of the enxyme
11 If an enzyme solutionis saturated with substrate, the most effective way to obtain an even faster yield of products would be. Add more of the enxymes Add more substrate Add an allosteric inhibitor Add a non competitive inhibitor
12 Enxyme B requires Zn+2 to catalyse the conversion of substrate X. The zinc is best identified as a . Product Substrate Activator Coenzyme
13 Which of the following statemetns about enzymes is correct.  They increasse the activation energy of a reaction  They are consumed during the reaction  They are specific in terms of the reactions they catalyse They always wor optimally at high temperatures.
14 Which of the following is an example of hydrolases. Glycogen phosphorylase Lipase Pyruvte decarboxylase Cytochrome oxidase
15 The enzymes that catalyse the rections in whihc two molecules are joined togeter by synthesis of new bonds, using enery from ATP, are placed in group Hydrolase Ligase Transferase
16 What reoles does nicotinamide adenine dinucleotide playin oxidateive pathways. Coenzyme Enzyme Prostheitic group Inhibitor
17 The type of conjugated molecules involved in the regulatio of gene expression are. Nucleoproteins Glycoprotein Nucleosomes Both a and c
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