Question: Answer the following question given this paragraph: View an animation (http://openstaxcollege. org/l/hexokinase2) of induced fit. When an enzyme binds its substrate, an enzyme-substrate complex is formed. This complex lowers the activation energy of the reaction and promotes its rapid progression in one of multiple possible ways. On a basic level, enzymes promote chemical reactions that involve more than one substrate by bringing the substrates together in an optimal orientation for reaction. Another way in which enzymes promote the reaction of their substrates is by creating an optimal environment within the active site for the reaction to occur. The chemical properties that emerge from the particular arrangement of amino acid R groups within an active site create the perfect environment for an enzyme's specific substrates to react. The enzyme-substrate complex can also lower activation energy by compromising the bond structure so that it is easier to break. Finally, enzymes can also lower activation energies by taking part in the chemical reaction itself. In these cases, it is important to remember that the enzyme will always return to its original state by the completion of the reaction. One of the hallmark properties of enzymes is that they remain ultimately unchanged by the reactions they catalyze. After an enzyme has catalyzed a reaction, it releases its product(s) and can catalyze a new reaction. Q: What is formed when an enzyme binds its substrate? Choices: - vessel - substrate complex - nucleus - substrate complex - lock and key model - enzyme - substrate complex A:
Answer: enzyme - substrate complex

Question: Answer the following question given this paragraph: Plant-like protists are commonly called algae (alga, singular) . Some algae consist of single cells. They are called diatoms. Other algae are multicellular. An example is seaweed. Seaweed called kelp can grow as large as trees. You can see both a diatom and kelp in Figure below . Algae are probably ancestors of plants. Q: Plant-like protists are commonly called what? Choices: - fungus - sponge - seaweed - algae A:
Answer: algae

Question: Answer the following question given this paragraph: The pond on the left is covered with algae because there is too much nitrogen in the water. The red-shaded area in the map on the right is a dead zone in the Gulf of Mexico. It's called the hypoxic ("low oxygen") zone in the figure. Q: What does hypoxic mean? Choices: - standard oxygen level - Oxygen rate - higher oxygen - low oxygen A:
Answer:
low oxygen