Enzymes, such as the one shown in the picture, work by fitting onto the substrate molecule like a lock-and-key action. which statement is true, with regard to the enzyme and the substrate? a) the enzyme weakens chemical bonds in the substrate and catalyzes a change into the product. the enzyme itself remains unchanged. b) the enzyme weakens chemical bonds in the substrate and catalyzes a change into the product. the enzyme is also consumed in the reaction. c) the substrate reacts with the enzyme in the active site to produce a product. the enzyme, though changed, does not become a part of the product. d) the substrate reacts with the enzyme in the active site to produce a product. both the enzyme and the substrate combine and change into a product.

Which of the following sex and generation combinations directly produces the pollen tube of angiosperms? a) male gametophyteb) female gametophytec) male sporophyted) female sporophyte

Me brainliest 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?

Need the diagram below, which is not drawn to scale, shows the position of the earth, moon, and sun. what type of eclipse occurs when the earth, moon, and sun are lined up in the order shown? a. planetary eclipse b. solar eclipse c. martian eclipse d. lunar eclipse