The activity of many cellular enzymes is regulated by activators and inhibitors. Enzyme activity is also regulated in eukaryotic cells by which of the following mechanisms? Compartmentalization and restricting enzymes to specific organelles or membranes
Secreting enzymes out of the cell
Decreasing the availability of substrates
Changing the primary structure of enzymes

a- multicellular

b-eukaryotic

c-no cell wall

d-heterotrophic

e-autotrophic

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.

1. is geographic distribution

2 is increasing complexity

3 is transitional forms