You have purified the enzyme enolase from both beef heart and e. coli. enolase catalyzes the conversion of 2-phosphoglycerate to phosphoenolpyruvate. you have carried out preliminary kinetic analysis and obtained the following data: Enzym source Km VmaxBeef Heart 1.9x10^-3 M 290 nmol/minE. Coli 24x10^-6 M 18 nmol/minYour boss ask you which enzyme is more efficient. What is your answer and why?

The one from E coli

Explanation:

One way of determining catalytic efficiency is to calculate the ratio of Vmax to Km  

For beef heart,

For E coli ,

Thus, the enzyme from E. coli is 50 times as efficient as the one from beef hea rt.

c. earths continental crust is thicker than its lithosphere.

because, the lithosphere is the outermost layer of the earth/ 100 km thick and is defined by its machanical properties.the lithosphere contains oceanic and continental crust that varies in age and thickness across locations and geologic time. the lithosphere is the coolest layer of the earth in terms of temperature. the term lithosphere should not be confused with the use of "geosphere" which is used to indicate all of earth systems, including the atmosphere, hydrosphere   and biosphere. the surface of the earth can be divided into the continental crust and the oceanic crust.   the continental crust is made mostly of granite while the oceanic crust is made of basalt. the average thickness of the continental crust is 25 miles and the average thickness of the oceanic crust is 5 miles.   three types of rock, igneous, sedimentary, and metamorphic, make up the surface of the earth. that's why 3 option is preferable.

weathering - colorado river carves land in arizona to form the grand canyon. cracks form in a sandstone wall surrounding a house. a marble statue near the science museum is changing color due to rainfall

erosion - after a rainstorm, soil and rock piees litter the roadways. the sand dunes in the sahara desert are changing shape.

here's your answer.