MCQ
Phosphorylation of glucose during glycolysis is catalysed by:
- APhosphoglucomutase.
- BPhosphoglucoisomerase.
- CHexokinase.
- DPhosphorylase.
Explanation:
Hexokinase catalyses the conversion of glucose into glucose 6-phosphate by the use of ATP molecule in phosphorylation reaction. The other options are incorrect because Phosphoglucomutase is an enzyme that transfers a phosphate group in D-glucose monomer from 1 to 6 position of carbon in forward direction (changes glucose 1 - phosphate to glucose-6 phosphate). Phosphoglucoisomerase catalyses conversion of glucose 6 phosphate to fructose 6 phosphate. Phosphorylase is an enzyme which catalyses the addition of phosphate PO4 group from inorganic phosphate to an acceptor.
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$(i)$ In prokaryotic cells, a special membranous structure formed by the extension of the plasma membrane into the cell is known as polysome.
$(ii)$ The smooth endoplasmic reticulum is the major site for synthesis of glycoproteins.
$(iii)$ $RuBisCO$ is the most abundant protein in the whole biosphere.
$(iv)$ Mitochondria, chloroplasts and peroxisomes are not considered as part of endomembrane system.
Of the above statements