Name and explain the manner in which at least three factors can influence the speed of an enzymatic reaction. How do cells regulate the activity of enzymes?

What are the factors which influence enzyme activity? Discuss them in brief.

What are the factors which influence enzyme activity? Discuss them in brief.

Name the part of a cell in which many chemical reactions occur with the help of enzymes.

Explain what do you understand by evaporation. Discuss the factors which influence the rate of evaporation of a liquid.

A regularity gene produces some kind of protein through its m-RNA that controls the activity of the operator gene which signals the formation of specific enzyme required for the metabolic breakdown of the food. How does that protein regulate the activity of the operator gene?

(a) Draw magnetic field lines of a bar magnet. "Two magnetic field lines never intersect each other." Why ? (b) An electric oven of 1.5 kW is operated in a dometic circuit (220V) that has a current rating of 5A. What result do you expect in this case ? Explain . or Which is meant by resistance of a conductor ? Name and define its SI units. List the factors on which the resistance of a conductor depends. How is the resistance of a wire affected if - (i) its length is doubled , (ii) its radius is doubled ?

State three factors on which the resistance of a wire depends. Explain how does the resistance depend on the factors stated by you.

State and explain Arrhenius equation. How can we determine the activation energy of a reaction using this equation?

Name three factors on which the heat energy absorbed by a body depends and state how does it depend on them.

It is not always easy to predict the position of attack on multiply substituted benzene. If the benzene ring bears different ortho//para directing group at the 1 and 4 positions, the position of further substitution is not immediately clear. Sometimes steric effects determine the outcome. In other cases, electronic factors determine the outcome, and further reaction will be at the position activated by the more strongly activating group. Some substituens are so strongly activating that no catalyst is needed, and it is often diffcult to stop substitution after mono substituion. Mild condition are needed to restrict the reaction to mono-substitution. It is possible to reduce the activity such groups by side chain reaction so that the reaction can be stopped use can sometimes be made of removable blocking groups on the ring. Which of the following side reaction//s can be used to reduce the activity of strongly activating groups like -OH ?