The table represents the results of an experiment where the effects of pH buffers on an enzyme found in saliva (amylase) were studied. A spectrophotometer set at 500 nm was used to measure absorbance at the various pH levels every 20 seconds for 2 minutes. The higher absorbance values would indicate greater enzyme activity. All experiments were conducted at the same temperature. Which statement correctly identifies the result that the optimum pH for amylase function is 7?

The amylase had the higher absorbance with a pH of 7.

Explanation:

Enzyme activity values are given by the spectrophotometric method. The constant temperature is maintained in order to evaluate the pH independent effect. The absorbance is then measured at various pHs and the one that corresponds to the greatest absorbance is the pH at which the enzyme has its peak activity. So pH 7 is the optimal pH condition.

answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.

in the year 2850, humans successfully colonized mars. the martian modules that were constructed could hold only a small population of people. it is now a century later, and the population on mars has grown to 600 people. of the current mars population, 45 people express the recessive phenotype for phenylketon- uria (pku) syndrome (pp genotype).

explanation: