Bio ch 6

The process of stabilizing the structure of an enzyme in it's active form by the binding of a model is an example of

Allosteric regulation

Which of the following correctly states the relationship between anabolic and catabolic pathways

Anabolic pathways synthesize more complex organic molecules using the energy derived from catabolic pathways

If the entropy of a living organism is decreasing which of the following is also occurring

Energy is being supplied to the organism

If the entropy of a living organism is decreasing which of the following is also occurring?

Energy is being supplied to the organism

Which of the following statements about enzymes function is correct?

Enzymes can lower the activation energy of reactions but they cannot change the equilibrium point because they cannot change the net energy output

Choose the pair of terms that correctly completes the sentence: catabolism is to Anabolism as ___ is to ____

Exergonic; endergonic

Which of the following is an endergonic reaction?

Glucose + fructose = sucrose

Enzyme activity is affected by pH because

High or low pH may disrupt hydrogen bonding or ionic interactions and that's change the shape of the enzymes active site

What do the sign and magnitude of the 🔺G of a reaction tell us about the speed of the reaction?

Neither of the sign nor the magnitude of 🔺G has anything to do with the speed of a reaction

Which of the following environments or actions would not affect the rate of an enzyme reaction

None of the listed responses is correct

Organisms are described as thermodynamically open systems. which of the following statements is consistent with this description?

Organisms require energy from and lose energy to their surroundings

Most cells cannot harness heat to perform work because

Temperature is usually uniform throughout a cell

Which of these statements about enzyme inhibitors is true

The action of competitive inhibitor's may be reversible or irreversible

Which of the following is changed in a reaction by the action of an enzyme

The activation energy

Which of the following statements about the active site of an enzyme is correct

The active site may resemble a group or pocket in the surface of a protein into which the substrate fits

Metabolic pathways in cells are typically far from equilibrium which of the following processes tends to keep these pathways away from equilibrium

The continuous removal of the products of a pathway to be used in other reactions and the input of free energy from outside the pathway

What is meant by the induced fit of an enzyme

The enzyme changes its shape slightly as it binds the substrate

Which of the following determines the sign of 🔺G for a reaction?

The free energy of the reactants and free energy of the products

Which of the following best characterizes the functional role of ATP in cellular Metaballism

The free energy released by ATP hydrolysis is coupled to undergone of processes via the formation of a phosphorylated intermediate

The formation of glucose six phosphate from glucose is an endergonic reaction and would therefore be coupled to which of the following reactions or pathways?

The hydrolysis of ATP

Much of the suitability of ATP as an energy intermediary is related to the instability of the bonds between the phosphate groups. these bonds are unstable because

The negatively charged phosphate groups vigorously repel one another and the terminal phosphate group is more stable and water than it is in ATP

A chemical reaction is designated as exergonic rather than endergonic when

The potential energy of the products is less than the potential energy of the reactants

Some bacteria are metabolically active in hot springs because

There enzymes have high optimal temperatures