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Which of the following steps during glyc...

Which of the following steps during glycolysis is associated with utilisation of ATP?

A

Glucose `rarr` Glucose -6-phosphate

B

Fructose-6-phosphate `rarr` Fructose-1,6-biphosphate

C

PEP `rarr` Pyruvic acid

D

Both (a) and (b)

Text Solution

Verified by Experts

The correct Answer is:
D
In the initial phase (energy spendling phase) of glycolysis, the hexoses (i.e., glucose and fructose) ar phosphorylated in a reaction that uses ATP at two steps : First in the conversion of glucose into glucose-6-phosphate and second in the conversion of fructose-6-phophaste to fructose-1,6-biphosphate.
These reactions are catalysed by the hexokinase and phospho-fructokinase respectively
`"Glucose + ATP" underset(Mg^(2+))overset("hexokinase")(rarr) "Glucose-6-phosphate + ADP"`
`"Fructose-6-phosphate + ATP" underset(Mg^(2+))overset("Phosphofructokinase")(rarr) "Fructose-1,6-biphosphate + ADP"`
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Knowledge Check

  • What of the following step during glycolysis is associated with utilization of ATP ?

    A
    Glucose `rarr` Glucose -6- phosphate
    B
    Fructose-6-phosohate `rarr` Fructose -1,6- bisphosphate
    C
    PEP `rarr` pyruvic acid
    D
    Both (A) and (B)

  • Which of the following steps in cellular respiration is associated with release of maximum number of ATP molecules?

    A
    Glycolysis
    B
    Kreb's cycle
    C
    Oxidative phosphorylation
    D
    Reduction of NADP

  • Which of the following is the first step of glycolysis ?

    A
    Conversion of glucose into fructose
    B
    Dehydrogenation of glucose
    C
    Breakdown of glucose
    D
    Phosphorylation of glucose.

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