1.)What is a competitive inhibitor? * Something that speeds up a reaction by helping an enzyme.
*An inhibitor that binds at a site other than the active site. This changes the shape of
the active site and thus stops the enzyme from binding to a substrate.
*An inhibitor that cannot bind to an enzyme.
*An inhibitor that is shaped like a substrate so it slows down a reaction by binding to
the active site.

2.)What is an allosteric (noncompetitive) inhibitor?

*Something that speeds up a reaction by helping an enzyme.
*An inhibitor that binds at a site other than the active site. This changes the shape of
the active site and thus stops the enzyme from binding to a substrate.
*An inhibitor that cannot bind to an enzyme.
*An inhibitor that is shaped like a substrate so it slows down a reaction by binding to
the active site.

the statement is true

the scientific method.

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.

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: