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The hydrolysis of sucrose to glucose and fructose is exergonic. However, if sucrose is dissolved in water and the solution is kept overnight at room temperature, there is no detectable conversion to glucose and fructose. Why? a. A. The change in free energy of the reaction is positive. B. The activation energy of the reaction is high. C. The change in free energy of the reaction is negative. D. This is a hydrolysis reaction, so it requires an input of energy. E. The free energy of the products is higher than the free energy of the reactants

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Related questions

3) The hydrolysis of sucrose to glucose and fructose is exergonic. However, if you dissolve sucrose in water and keep the solution overnight at room temperature, there is no detectable conversion to glucose and fructose. Why?

Select one:

a. The change in free energy of the reaction is negative.

b. The activation energy of the reaction is high.

c. The free energy of the products is higher than the free energy of the reactants.

d. This is a condensation reaction.

e. The change in free energy of the reaction is positive.

5) Competitive inhibition differs from non-competitive inhibition in that the ___1___ site is where we see competitive inhibition, while the non-competitive inhibitor __2___.

1. a. allosteric b. non-active c. active d. hydrophillic e. hydrophobic

2.
a. binds to the active site, thus blocking it
b. binds outside the active site, changing the shape of the enzyme
c. binds outside the active site, and blocks the active site

6) Phosphofructokinase is an enzyme, and as such it __1___ of the reaction. It is part of glycolysis, and is an example of an enzyme controlled by inhibition, as high levels of citrate (an intermediate further down the catabolic pathway) turns the enzyme off
(1)Select one:
a. lowers activation energy
b. lowers the ΔG
c. raises the Free Energy
(2)Select one
a. non-competitivenegative feedback
b. irreversible competitivereversible competitive.

15)The reactions in the pathways of glycolysis and the citric acid cycle harvest the high-energy electrons stored in glucose. Therefore, these pathways _______________.

Select one:

a. take place in animal cells, but not in plant cells
b. are catabolic pathways
c. are anabolic pathways
d. involve the reduction of glucose and its metabolic intermediates

21) In an exergonic chemical reaction, the products have less free energy than the reactants (-ΔG). Endergonic reactions require an input of energy (+ΔG). The addition of starting materials and the removal of end products prevent metabolism from reaching final equilibrium. Instead, the cell exists in a state of dynamic equilibrium.

Select one:
True
False

Table sugar (or sucrose, a disaccharide made of the monomersglucose and fructose) is dissolved in water at room temperature. Aresearcher cannot detect smaller components (glucose, fructose, CO2and other fragments) because
A. The sucrose has lessfree energy than its components.
B. Breaking apartsucrose to make CO2 is endergonic.
C. The activation energybarrier cannot be overcome by the sucrose molecules.
D. Tearing apart sucroseto form CO2 is not a spontaneous reaction.

1. An exergonic reaction is one that _______.

An exergonic reaction is one that

Releases energy that is available to do work.

Requires an input of energy.

is at equilibrium.

is not spontaneous.

2.

Enzymes accelerate the rate of reactions by______.

Lowering the activation energy.

Lower the Gibbs free energy.

Lowering the energy of the reactants.

Increasing the energy of the products.

3.

Glycolysis is an example of a __________.

anabolic reaction

photosynthetic reaction

synergistic reaction

catabolic reaction

4.

Glucose is a ________.

protein

lipid

nucleic acid

carbohydrate

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