1 Which of the following controls the total activity of an e

1)

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

2)

Which is a likely outcome following an increase in cellular AMP levels?

None of the choices listed

Increased fatty acid oxidation

Increased fatty acid synthesis

More than one of the choices listed

Increased glucose uptake

3)

Gluconeogenesis results in the net gain of ____.

2 GTP

More than one of these choices

Glucose

Pyruvate

4 ATP

4)

Which of the following metabolic enzymes uses GTP instead of ATP as the source of phosphoryl transfer?

Glyceraldehyde dehydrogenase

None of the choices listed

Pyruvate carboxylase

PEP carboxykinase

Phosphoglycerate mutase

5)

During glycolysis, what is the logic behind phosphorylation of C1 and C6 of fructose?

More than one of these choices

None of the choices listed

Phosphorylation ensures that intermediates remain in the cell

Phosphorylation ensures that products of C-C bond cleavage are interconvertible

Phosphorylation ensures that two products are funneled into single pathway

Solution

1. a) Ubiquitination controls the activity of the enzyme

2. e) increase in cellular AMP levels indicates increased glucose uptake

3. c) Gluconeogenesis results in the net gain of glucose

4. d) PEP carboxykinase uses GTP instead of ATP as the source of phosphoryl transfer