Exam 10: Introduction to Metabolism

Enzymes increase the rate of a reaction but do not alter equilibrium constants.

The Michaelis constant (Km)of an enzyme is the substrate concentration that produces maximum velocity.

A molecule that binds to an enzyme at a location other than the active site and thereby alters the enzyme's shape,making it inactive or less active is a(n)__________ inhibitor.

In a branched pathway with many end products,an abundance of one of the end products will usually inhibit

Which of the following is a reason for metabolic regulation?

The molecules formed by an enzyme-catalyzed reaction are called __________.

An chemical reaction that requires an input of energy in order to proceed is __________.

The substrate of an enzyme binds at the

Enzyme activity can be controlled by

RNA molecules that have catalytic activity are known as ____________.

The electron transport chain is based on the principle that redox couples with more positive reduction potentials will donate electrons to couples with more negative potentials.

Metabolic channeling involves the localization of __________ in different parts of a cell in order to influence the activity of metabolic pathways.

The numerical value of the free energy change indicates how fast a reaction will reach equilibrium.

Cells must efficiently transfer energy from their energy-trapping systems to the systems actually carrying out work and also use various metabolic processes to replace the energy used in doing work.This is called the __________.

A reaction in which the forward rate is equal to the reverse rate is said to be at __________.

Enzyme activity can be greatly affected by the pH and the temperature of the environment in which the enzyme must function.

A molecule that binds noncovalently to an enzyme at the active site and thereby prevents a substrate from binding and reacting is a(n)__________ inhibitor.

Electron transport molecules that only transfer electrons include

_________ is the total of all chemical reactions occurring in the cell.

The equilibrium constant for a redox reaction is called the standard reduction potential.