Exam 6: Energy Flow in the Life of a Cell

The hydrolysis of sucrose to glucose and fructose is a spontaneous reaction inside our bodies. 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 not?

When, if ever, do molecules stop moving?

When solid sodium hydroxide is added to water, the solution gets hot. This is an example of a(n)

The metabolism of a cell is the sum of all of its chemical reactions.

Energy is defined as the capacity to do work.

The law of conservation of energy states that although the form of energy used remains the same, the total amount of energy changes.

Place these steps of enzyme catalysis in the correct order: 1. The substrate and enzyme change shape. 2) The substrate enters the active site. 3) The enzyme reverts to its original configuration. 4) The product is expelled.

The photosynthetic reaction is considered an endergonic reaction.

ATP is considered a short- term form of energy for the cell, whereas or represent more stable, long- term energy stores.

All of the following statements are true of the first law of thermodynamics EXCEPT

In an isolated system, all of the following are true of the second law of thermodynamics EXCEPT

Entropy is a measure of an increase in

Which of the following has the greatest amount of kinetic energy?

Which of the following is NOT a commonly used energy carrier in the cell?

are biological catalysts.

Sitting at the top of a slide, a child has energy; sliding down, she is using energy.

Which statement best describes the relationship between an enzyme and a reactant?

Which of the following will bind to the active site of an enzyme?

Explain how enzymes decrease the activation energy required for biological processes in our bodies.

For many enzymes, the rate of product formation increases as the concentration of the substrate increases. Eventually the rate of the reaction reaches a maximum at which further increases in the concentration of the substrate have no effect. Why?