QUESTION 1 What is the name for a measurement that is water by 1 degree Celcius?
ID: 212261 • Letter: Q
Question
QUESTION 1 What is the name for a measurement that is water by 1 degree Celcius? c a inch 1. the amount ofenergy that can raise the temperature of gram of b. c meter C. gram c d calorie QUESTION 2 What is the type of energy found in the chemical bonds of molecules? 1. a. both potential energy and chemical energy b. mechanical energy c. chemical energy d.potential energy QUESTION 3 An inhibitor molecule binds to an enzyme in its active site to prevent the substrate from binding. This is called c 1. a competitive inhibition b, non-competitive inhibition c. allosteric regulation d.energy ofactivation cExplanation / Answer
1. calorie is the amount of heat required to increase the temperature of 1 gram of water by 1 degree Celsius at 1 standard atmosphere pressure. 1 cal is equal to 4.184 Joules of energy. 1 Joule is 0.293 calories. Its symbol is cal.
Right option is d. calorie
2. Chemical energy and potential energy is stored in the chemical bonds of molecules. Chemical energy is the potential energy that is required to undergo chemical transformation.
Right option is a, both potential and chemical energy
3. In competitive inhibition, the inhibitor binds to the active site, preventing the substrate to bind to the enzyme. As a result, the enzyme catalyzed reaction is inhibited. There is increase in Km, but Vmax remains the same. Increasing substrate concentration can overcome this type of inhibition.
Right option is a. competitive inhibition.
4. In exergonic reaction, the reactants have more free energy than the products. The excess energy is released in form of heat. These are spontaneous reactions, not requiring an heat input.
Right option is c. the products have less free energy than the reactants and the reaction will release energy.
5. pH, temperature, and concentration of substrate will affect enzyme function. Higher substrate concentration will improve enzyme function until steady state is reached. Each enzyme has a optimal temperature and pH for activity. However, enzymes being catalysts, are not used up or destroyed in a reaction. They only speed up the rate of reaction.
Right option is c. how quickly the enzyme is used up or destroyed by the reaction.
6. Oxidation-reduction reaction involves transfer of electrons between species. Oxidation is a loss of electrons while reduction is a gain of electrons. Oxidoreductases carry out oxidation-reduction reaction. Oxidation results in the increase in oxidation number of a molecule.
Right option is b. Oxidation is loss of electrons. Reduction is gain of electrons.
7. First law of thermodynamics states that there is conservation of energy in a system. Total energy in a system is always constant. Energy can never be created nor destroyed but can be transferred from one form to another. It is also known as Law of conservation of energy. Delta u= Q-W. Delta U is change in internal energy. Q= heat supplied, W= work done.
Right option is a. energy can never be created……to another.
8. Enzymes increase rate of reaction by decreasing the activation energy. Binding of substrate to enzyme causes a conformational changes that reduces the activation energy. Hence, substrates are converted to products.
Right option is decreasing activation energy.
9. Entropy is a thermodynamic quantity that represents the unavailability thermal energy of system to be converted into mechanical work Entropy is a measure of disorder or randomness of a system. This is because useable energy decreases over time and leads to disorder or randomness. When energy is converted from one form to another, entropy increases. This is because some amount of energy is used to perform work and is lost.
Right option is d. entropy, increases
10. Sucrase is the enzyme as it is present in both reactant and product side of the reaction. Enzymes are catalysts that increase the rate of the reaction, but are not utilized in the reaction. Enzymes will only speed up the reaction.
Right option is d. Sucrase
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