Which of the following best explains why an enzyme hasn't evolved to catalyze the following reaction as the first step of glycolysis? glucose + pi glucose-6-phosphate i. the use of atp is required for this step to serve as a regulatory control point. ii. the use of atp is important because it keep its concentration low. otherwise the high [atp] would slow glycolysis too much through feedback inhibition. iii. the large positive of this reaction would need to be overcome by an exceedingly high [pi]. iv. inorganic phosphate cannot be specifically placed on the carbon in the 6th position.

Read the following scenario to answer the following question. over the past 60 years, many amphibian species have experienced significant population declines, and some species have become extinct. scientists suspected that local human activities such as the destruction of wetlands, regional pollution, and deforestation were the main reasons for these losses. however, research over the past 20 years reveals significant amphibian population declines in protected areas of the world, such as nature preserves and parks. these global declines suggest widespread problems including increased ultraviolet radiation, acid rain, and disease. in switzerland, for example, 14 of the 20 native amphibian species are threatened with extinction. when most populations of a wide-ranging amphibian species are lost and the few remaining populations are widely separated, we expect to see that a. the founder effect becomes increasingly important b. microevolution no longer occurs c. gene flow between populations is reduced d. artificial selection becomes a greater factor in microevolution

In which case would a scientist choose to use a dissecting microscope rather than a compound microscope

Each pair of clay balls represents two planetesimals. if each planetesimal is composed of the same material and is separated he the same distance, which pair experiences the frayed gravitational attraction?