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masha68 [24]
4 years ago
5

Determine whether each phrase describes glucokinase, hexokinase isozymes I–III, or all hexokinase isozymes. Note: Assume that th

e kinetic behavior of hexokinase isozymes in vivo is similar to in vitro. Glucokinase (hexokinase IV) Hexokinase I, II, or III All hexokinase isozymes (I–IV)
Biology
1 answer:
finlep [7]4 years ago
8 0

Glucokinase ( Hexokinase IV): Plays significant role, not sensisitve

Hexokinase I II or III : In tissues,

<u>Explanation:</u>

A) Plays a significant role in liver regulation of blood glucse levels. (It is present within liver).

B) It is not sensitive to inhibition by glucose-6-phoaphate(remians active even when glucose is abundant and is not effected by allosteric inhibition.)

C) Subcellular localisation is regulated by fructose-6-phosphate (when fructose -6-phosphate concentration is high causes localisation of hexokinase IV to nucleus as it is inhibited by high Fructose-6-phosphate concentration and releases into cytosol when glucose concntration is high)

<u>2. Hexokinase I II or III :</u>

A)Present in tissues that sense blood glucose levels.

B) When blood glucose levels fall below normal range maintains maximum velocity. ( since it has high affinity for glucose and low glucose concentration favors low Km for hexokinase I II III) .

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