30) which of the following is true of enzymes?
a) enzyme function is increased if the 3- d structure or conformation of an enzyme is altered.
b) enzyme function is independent of physical and chemical environmental factors such as ph and temperature.
c) enzymes increase the rate of chemical reaction by lowering activation energy barriers.
d) enzymes increase the rate of chemical reaction by providing activation energy to the substrate.

Which of these is the most likely consequence of falling petroleum price

20 point pls brianliest 1. what does a red shift mean? blue shift? 2. describe the big bang theory. according to this theory, how old is the universe? 3. scientists believe the universe is expanding. what is the evidence that supports this? 4. describe a nebula. 5. describe the 3 types of galaxies. what is a barred spiral galaxy? 6. what is a light year? how far is alpha centauri from earth? 7. describe the universal law of gravitation. be sure to include gravitational force between two objects. 8. describe the planets’ orbits around the sun. 9. what is the asteroid belt? where is it located? 10. describe rotation and revolution of earth. what determines an earth day and year? 11. how do galaxies exist? 12. compare and contrast the inner and outer planets. 13. what causes the seasons?

This is an active transport mechanism by which cells pump sodium and potassium ions against the concentration gradient