14680094
Description
Flashcards by Maria Cecilia, updated more than 1 year ago
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Created by Maria Cecilia
over 6 years ago
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| Question | Answer |
| A. Transition state B. Substrate/Reactants C. Products D. ΔG E. Activation energy Blue curve: reaction without enzyme Green curve: reaction with enzyme | |
| What is the general name for a chemical agent that speeds up a reaction without being consumed by the reaction? | Catalyst |
| Explain the scheme: | Induced fit model: As the substrate enters the active site, the enzyme changes shape slightly. Shape changes makes the active site fit more 'snugly' around the substrate, that can then be converted in the products. |
| What is the collective name of all the chemical reactions that occur within an organism? | Metabolism |
| Give 2 ways by which enzymes can lower activation energy | 1. Orientating substrates correctly 2. Straining substrate bonds 3. Providing a favourable micro-environment 4. Directly participating in the reaction |
| What do the variables mean in the equation G = H - TS | G: Gibb's free energy H: enthalpy T: temperature S: entropy |
| Draw a graph showing how substrate concentration can affect the rate of reaction | |
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Which graph shows the effect of pH on enzyme activity?
Image:
P H (binary/octet-stream)
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D |
| How do we call non-protein helpers for catalytic activity? | Cofactors |
| Estimate the optimal temperature for the enzyme X represented below: | 50oC |
| What is a coenzyme? Give one example | Coenzymes: non-protein organic cofactors Example: vitamins |
| All cofactors are coenzymes, but not all coenzymes are cofactors. Do you agree? | No: all coenzymes are cofactors, but not all cofactors are coenzymes because inorganic metal ions are also cofactors. |
| Illustrate the process of energy coupling | |
| Name and explain the type of enzyme inhibition illustrated by the figure: | Competitive inhibition: The inhibitor blocks the substrate from entering the active site |
| Which state has higher entropy? | |
| Illustrate the process of feedback inhibition | |
| Which graph represents an endergonic reaction? | |
| Name and explain the process illustrated by the figure | Allosteric inhibition: a regulatory molecule binds to the allosteric site of an enzyme, changing the shape of the enzyme so that the substrate cannot bind to the active site of the enzyme |
| Which direction represents an anabolic reaction? | |
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Which state has the highest kinetic energy? And potential energy?
Image:
Energy (binary/octet-stream)
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Potential energy: A Kinetic energy: B |
| Name the form of allosteric regulation in which binding of one substrate molecule to a multisubunit enzyme triggers shape change in all subunits | Cooperativity |
| Explain the scheme: | Good luck! ;-) |
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