BIO150 Chapter 1

A small amount of enzymes can act on a large amount of substrate because

• enzymes do not change after a reaction and can be used again.

• a little enzyme can supply enough energy to carry out a reaction.

• as the reaction is going on, more enzymes are produced.

• enzymes act in a all or none situation.

Which of the following is not true about enzymes?

• Enzymes are denatured at temperatures above 60^oC.

• Enzymes can catalyse chemical reactions.

• All enzymes react optimally at a neutral pH.

• Reaction of enzymes is reversible.

The diagram shows the mechanism of enzyme action.

What does P represent?

• Enzyme

• Substrate

• Enzyme-substrate complex

• Products of the reaction

Figure 1 shows the structure of enzyme N change to structure R when being heat above 60^oC through the process P. Name P?

• hydrolysis

• deamination

• denaturation

• condensation

Tags

NGSS.HS-PS1-5

Graph in figure shows the effects of temperature on the rate of an enzyme- catalysed-reaction. Which of the following statement is correct?

• When the temperatures is low, the enzyme-catalyzed reaction is high.

• When the temperatures is high, the rate of reaction is not accelerated.

• When the temperatures is optimum, the enzyme catalyses the reaction at the maximum rate.

• When the temperatures is beyond the optimum, the enzyme catalyses the reaction is increase

Table shows the result obtained from the experiment to investigate the temperature on the activity of amylase.What inference can be made from the above observations?

• In test tube Q, rate of reaction is decreasing.

• In test tube R, rate of reaction is optimum

• In test tube S, rate of reaction is increasing

• In test tube T, rate of reaction is accelerated

Tags

NGSS.HS-LS2-4

Figure shows the relationship between the rate of reaction and substrate concentration.

• When the concentration of substrate increase more product is produced because more subtrate molecules are available to bind the active sites of the enzymes

• The rate of reaction increases because there are less chances of collisions between the substrate molecules and the enzymes molecules

• When the substrate concentration increases, the speed of reaction also increases because less substrate binds the active of the enzymes

• The rate of reaction is directly proportional the substrate concentrate continuously without limiting factor.

Which enzyme works best at pH 1.5 - 2.5?

• Lipase

• Pepsin

• Trypsin

• Amylase

Which of the following helps enzyme to function well?

• Product

• Cofactor

• Inhibitor

• Substrate

On an enzyme, a substrate attaches to the _____

• Polypeptide

• Base

• Substrate

• Active site