Select the incorrect statement w.r.t. enzyme action.
1. Enzyme shows highest activity at optimum temperature and pH
2. Low temperature causes permanent denaturation of enzymes
3. Enzymes bring down activation energy barrier
4. Thermostable enzymes retain catalytic power even at 80°C.

Each enzymes shows the highest activity at a particular temperature and pH called the _____temperature and _____pH respectively.

Read the given statements and select the correct option. Statement 1 : Low temperature destroys enzymes by causing their denaturation. Statement 2 : High temperature preserves the enzymes in their inactive state.

As temperature changes from 3^(@)C to 45^(@)C , the rate of enzyme activity will

Which of the following set is having correct statements for enzyme catalyst? 1. Each enzyme is specific for a given reaction 2. the enzyme activity is maximum at optimum pH 3. The enzymatic activity is increased in presence of certain substances called co - enzymes 4. The favourable temperature range of enzyme activity is between 50-60""^(@)C

Refer to the given graph showing relationship between temperature and enzyme action. Select the correct statement regarding 'A' and 'B'. (i) 'A' shows the rate at which reaction decreases due to denaturation of enzyme molecules. (ii) 'B' shows rate at which reaction increases due to decreased kinetic energy of substrate. (iii) As temperature rises, more and more enzyme molecules are denatured and 'A' appears to fall. (iv) 'B' shows rate at which reaction increases due to increased kinetic energy of substrate and enzyme molecules.

Which of the following will not negatively affect the activity of an enzyme? (a) Higher temperature than optimum (b) Lower temperature than optimum (c) Lower pH than optimum (d) Presence of coenzyme

Select the incorrect statement w.r.t decomposition. (a) Bacterial and fungal enzyme degrade detritus into simpler inorganic substances in a process is called catabolism. (b) Humans is less resistant to microbial action and undergones decomposition at an extremely slow rate. (c) By the process of leaching , watersoluble inorganic nutrients go down into the soil horizon and get precipitated as unavailable salts. (d) Decomposition is largely an oxygen requiring process.

Which of the following factor(s) do(es) not affect enzyme activity ? A. Temperature B. pH C. Enzyme concentration D. Product concentration E. Substrate concentration F. Activation energy

Select the correct statement regarding heterocysts. option 1-These are present in some filamentous cyanobacteria such as Nostoc and Anabaena. option 2- These cells are specialisd to perform N 2 − fixation. option 3- These cells contain enzyme nitrogenase. option 4- All of these

Study carefully the following statements and select the incorrect ones. When fats are used in respiration, the RQ is more than unity because fats contain more O_(2) and require relatively less amount of O_(2) for oxidation. (ii) The most important energy carrier is ATP. This energy rich compound is mobile and can pass from one cell to another. (iii) Before pyruvic acid enter Krebs' cycle, one of the two carbon atoms of pyruvic acid is reduced to carbon dioxide in the reaction called reductive carboxylation. (iv) A special electron carrier system located in the mitochondrial membrane is called shuttle system. It transfers electron from the hydrogens of cytoplasmic NADH to the mitochondrial electron carriers across the mitochondrial membrane. (v) Zymase is a complex mixture of many enzymes which requires several coenzymes for its action. The enzyme complex-zymase catalyses series of reaction taking place during fermentation leading to the production of ethyl alcohol.