Q: What is formed when an enzyme binds its substrate? Read this paragraph and choose the correct option from the provided answers: 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. Choices: - vessel - substrate complex - nucleus - substrate complex - lock and key model - enzyme - substrate complex A:
enzyme - substrate complex

(Question)
Q: Crabs, lobsters, shrimp, krill, and woodlice are all? Read this paragraph and choose the correct option from the provided answers: Crustaceans include crabs, lobsters, shrimp, krill, and woodlice. Choices: - sponges - porifera - arthropods - crustaceans A:
(Answer)
crustaceans

Ques: Q: What term describes how close estimates are to one another? Read this paragraph and choose the correct option from the provided answers: Precision describes how close estimates are to one another. Estimates that are relatively close to one another are precise. Let's assume that ten different students made an estimate of the volume shown in Figure above , and the values were: 52.9, 52.8, 52.9, 52.9, 53.3, 52.0, 52.8, 52.9, 53.0, 52.8. We can determine how precise these data by analyzing how close they are to an average. The average could be the mean, median or mode. The most common understanding of the average is the mean. This value is calculated by adding up all the numbers and then dividing by the total number of values. Other terms that can refer to the average are the median and the mode. The median is the middle value in a numerically ordered list of numbers. The mode is the value that occurs most often in a set of numbers. If no number is repeated, there is no mode for the list. Here are the calculated averages:. Choices: - precise - Distant - efficiency - precision A:
Ans: precision

(Q).
Q: What has atoms with unstable nuclei? Read this paragraph and choose the correct option from the provided answers: A radioisotope has atoms with unstable nuclei. Unstable nuclei naturally decay, or break down. They lose energy and particles and become more stable. As nuclei decay, they gain or lose protons, so the atoms become different elements. This is illustrated in the Figure below . The original, unstable nucleus is called the parent nucleus. After it loses a particle (in this case a type of particle called an alpha particle), it forms a daughter nucleus, with a different number of protons. Choices: - hydrocarbon - microwaves - radionuclide - radioisotope A:
(A).
radioisotope

Ques:Q: Every chemical reaction between molecules involves breaking and forming of what? Read this paragraph and choose the correct option from the provided answers: Choices: - orbits - ions - atomic pathways - bonds A:

Ans:bonds

Q: How many chambers does a mammalian heart have? Read this paragraph and choose the correct option from the provided answers: The four-chambered mammalian heart can pump blood in two different directions. The right side of the heart pumps blood to the lungs to pick up oxygen. The left side of the heart pumps blood containing oxygen to the rest of the body. Because of the dual pumping action of the heart, all of the blood going to body cells is rich in oxygen. Choices: - one - five - three - four A:
four