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Which one of the following does NOT occur in the reactions ofglycolysis between glucose and fructose-1,6-bisphosphate?

a. Product inhibition of an enzyme.

b. An isomerization.

c. Formation of a high energy intermediate.

d. Phosphoryl transfer.

I know the answer is not A, but I am not sure about the rest.Please help! : )

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Patrina Schowalter
Patrina SchowalterLv2
28 Sep 2019

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Question text

Phophofructokinase-1 (PFK-1) isan allosteric enzyme. Its activity is inhibited by:

Select one:
a. AMP
b. ATP
c. NAD+
d. glucose
e. All of the above

Question 18

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Question text

When the AMP levelin the cell is ___________ (High/Low), it binds at an allostericsite on the glycolytic enzyme phosphofructokinase and __________(activates/inhibits) it.
Select one:
a. High; activates
b. High; inhibits
c. Low; activates
d. Low, inhibits
e. No effect

Question 19

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Question text

In glycolysis, fructose 1,6-bisphosphate is converted to twoproducts with a standard free-energy change (?Go') of +23.8 kJ/mol.Under what conditions (encountered in a normal cell) will thefree-energy change (?G') be negative, enabling the reaction toproceed to the right?

Select one:
a. If the concentrations ofthe two products are high relative to that of fructose1,6-bisphosphate.
b. The reaction will not goto the right spontaneously under any conditions because the G ispositive.
c. Under standard conditions,enough energy is released to drive the reaction to the right.
d. When there is a highconcentration of fructose 1,6-bisphosphate relative to theconcentration of products.
e. When there is a highconcentration of products relative to the concentration of fructose1,6-bisphosphate.
Which of the following best explains why an enzyme hasn't evolvedto catalyze the following reaction as the first step ofglycolysis?

glucose + inorganic phosphate glucose-6-phosphate

a. The use of ATP is required for this step to serve as aregulatory control point.

b. The use of ATP is important because it helps keep theconcentration low. Otherwise the high [ATP] would slow glycolysistoo much through feedback inhibition.

c. The large positive ?G°' of this reaction would need to beovercome by an exceedingly high [Pi].

d. What are you talking about? That's exactly what doeshappen.

e. None of the above provide a reasonable explanation.

I know the answer is not d, but I'm not sure about the rest. Pleasehelp : )

1.Which of the following conversions is utilized to enhance the internal concentration of glucose in cells? a. Fructose-1,6-trisphosphate to G3P b. Glucose-6-phosphate to Fructose-1,6-trisphosphate c. Pyruvate to Acetyl CoA d. Glucose to Glucose-6-phosphate e. Ethyl alcohol to lactate

2. Why is it possible for one of a pair of identical twins to develop retinoblastoma, but not the other? a. The diagnosed sibling has an allele from the father, but the other does not. b. The other sibling is immune to it. c. The normal gene is dominant, and the twins are heterozygotes. d. The disease is not inherited. e. The disease is carried in the mitochondria.

3. Which of these is not characteristics of cancer cells? a. They can invade local tissues and metastasize. b. They don't need or have their own growth signals. c. They contain genetic abnormalities. d. They promote the formation of new blood vessels towards themselves. e. They all have the same shape and size as local tissues.

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