Ap Bio First Final- multiple choice questions

If the experiment is repeated at pH 11, the observed activity level of the enzyme will most likely be...

lower than level at pH 9

Butterflies of the genus Colias live in the Rocky Mountains where they experience a wide range of temperatures. Different variants of a particular glycolytic enzyme in the flight muscles are optimally active at different temperatures. Within the same population, some individual butterflies fly most effectively at 29 Degrees C, while others fly most effectively at 40 Degrees C, still others can be equally active at both temperatures. Which of the following claims is most consistent with the observed butterfly behavior?

Butterflies that express two variants of the enzyme are active over a greater range of temperature.

Alcohol dehydrogenase (ADH) is an enzyme that aids in the decomposition of ethyl alcohol (C2H5OH) into nontoxic substances. Methyl alcohol acts as a competitive inhibitor of ethyl alcohol by competing for the same active site on ADH. When attached to ADH, methyl alcohol is converted to formaldehyde, which is toxic in the body. Which of the following statements best predicts the effect of increasing the concentration of substrate (ethyl alcohol), while keeping the concentration of the inhibitor (methyl alcohol) constant?

Competitive inhibition will decrease because the proportion of the active sites occupied by substrate will increase.

Which of the following questions can be answered by figure 3?

Does the addition of an enzyme reduce the activation energy required for a reaction?

Enzymes with their highest activity at an acidic ph are represented by which of the following graphs?

III only

Which of the following predicts how the structure and functions of pepsin will change as it enters the small intestine?

Pepsin will change in shape because of the basic environment of the small intestine; therefore, its enzymatic activity will decrease.

Which of the following can be used to determine the rate of enzyme-catalyzed reactions?

Rate of disappearance of the substrate

Thermophilic bacteria such as Marinitoga piezophila are anaerobic, chemoorganotrophic, sulfur-reducing bacterium that have been found to reside in the deep-sea hydrothermal vent sites at the East Pacific Rise. Their cells produce enzymes that function optimally at temperatures of 80 degrees C or higher. At a temperature of 40 degrees C, how will the enzymes in these bacterial cells most likely be affected?

The enzymes will not increase the rate of reactions as much as they would at 80 degrees C

Which of the following best describes why the disks rose to the surface faster in the more concentrated hydrogen peroxide solutions?

The higher substrate concentrated in the more concentrated solutions speeded the reaction.

Figure 1 above shows the rate of activity for the enzyme peroxidase as different temperatures. Peroxidase is an enzyme found in a wide variety of organisms, from plants to humans to bacteria. Its function is to convert harmful hydrogen peroxide into harmless oxygen and water. Which of the following conclusions is supported by the graph above?

The rate of peroxidase activity is directly related to the percent increase in oxygen

Which of the following statements best helps explain the reaction specificity of an enzyme?

The shape and charge of the substrate are compatible with the active site of the enzyme

The most likely explanation for the results shown in Graph IV is that...

pH does not affect the enzymatic reaction