2) When blood glucose is below 5mM, which enzyme is most likely to convert it to

Question

2)

When blood glucose is below 5mM, which enzyme is most likely to convert it to glucose 6-phosphate?

Hexokinase I

Glucokinase

Hexokinase IV

All of the above

More than one of these choices

3)

Which of the following controls the total activity of an enzyme?

All of the choices listed

Ubiquitination

Phosphorylation/Dephosphorylation

mRNA translation on Ribosomes

Transcription of a specific gene

6)

Reactions far from equilibrium are highly regulated in metabolic pathways because:

The net flux through these steps is easily reversed

These reactions are highly exergonic

The rate differences between the forward and reverse steps are often small

These reactions occur most frequently in the cell

Enzymes that catalyze reactions far from equilibrium are more easily phosphorylated

Hexokinase I

Glucokinase

Hexokinase IV

All of the above

More than one of these choices

Explanation / Answer

2.. option D

All the above.

3. phosphorylation and dephosphorylation controls activity of enzymes .eg . kinases.

option C.

6. Option A

The net flux through these reactions can be reversed.

ie. the amount of substrates if decreased can slow down the reaction. If increases then rate of reaction is increased.

.

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