Quiz 17. Biomolecules

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Includes Nature of Enzyme Action, Factors effecting enzymatic reaction

Name of student *

1 point

The substrate binds to the active site of the enzyme, fitting into the active site...
*

1 point

This is first step of enzymatic reaction

This is second step of enzymatic reaction

This is Third step of enzymatic reaction

This is fourth step of enzymatic reaction

identify the given figure and find incorrect statement *

1 point

At point ?(in figure) enzymatic activity is maximum

? is Km

At point ?(in figure) enzymatic activity is half of maximum activity

Km is based on substrate concentration at which enzymatic activity is half of maximum

Which one of the figure depict the effect of temperature on velocity of enzymatic activity ? *

1 point

Figure a

Figure b

Figure c

Figure d

Find correct statement *

1 point

Enzyme show its maximum activity at optimum pH and temp

Below and above optimum temp and pH enzyme activity decreases

Very high temp can destroy enzyme tertiary structure

All are correct

Which of the following statement is incorrect regarding enzymatic activity ? *

1 point

It increases with increase in substrate concentration upto the saturation point

It is highest at optimum pH value

It initially decreases with increase in pH value

It initially increases with increase in temperature and then decreases

Km value of enzyme depends on. *

1 point

Temperature

pH value

Substrate concentration

Enzyme concentration

Which one of the figure depict the effect of pH on enzymatic activity velocity (V) *

1 point

Figure 1

Figure 2

Figure 3

Figure 4

Find correct answer based on figure *

1 point

X - Substrate concentration, Y - enzyme activity

Y - Substrate concentration, X - enzyme activity

X - Temperature, Y - enzyme activity

Y - Temperature, X - enzyme activity

Which of the following is correct ... *

1 point

Inorganic catalyst works efficiently at high temp and pressure

Enzymes get denatured at high temperature

Thermostable enzyme retain their activity at high temp

All are correct

This statement about enzymes is true....

1 point

Enzymes accelerate reactions by lowering the activation energy

Enzymes do not alter the overall change in free energy for a reaction

Enzymes are proteins whose three-dimensional form is key to their function

All of these

In the human body optimum temperature for enzymatic activities is....

1 point

37-degree celsius

25-degree celsius

20-degree celsius

15-degree celsius

Clear selection

Which of the figure depict the relationship between enzymatic activity velocity and substrate concentration ? *

1 point

Figure a

Figure b

Figure c

Figure d

Enzyme denature at temperature...

1 point

Very high or very low

Very low

Very high

At optimum temp

Clear selection

Which of the following affects enzyme activity?

1 point

Coenzymes and cofactors

Substrate concentration

Acidity (pH)

Temperature

All options are correct.

Clear selection

____________ is a representation of half of maximum activity of enzyme

1 point

Vmax

Enzyme activity

Turn over number

Clear selection

Catalytic efficiency at a substrate concentration of two different enzymes can be compared by

1 point

Vmax

Formation of product

Formation of ES complex

Clear selection

The given graph depict the change in concentration of the substrate on enzyme activity. Identify P, Q, R and select the correct options .

3 points

Vmax

Vmax/2

Half concentration of substrate

Clear selection

Find correct statement regarding enzyme activity...

1 point

With the increase in substrate concentration, the velocity of enzymatic reaction rises at first

The reaction ultimately reaches a maximum velocity (Vmax)

Enzyme reaction rate do not exceeded after Vmax, by any further rise in concentration of the substrate

After Vmax, enzyme molecules are fewer than the substrate molecules

All are correct

Clear selection

The activity of an enzyme is also sensitive to the presence of specific chemicals that bind to the enzyme. When the binding of this chemical shuts off enzyme activity.... This chemical is ....

1 point

Activator

Inhibitor

It is only metal

It is only inorganic

Clear selection

The inhibitor which closely resembles the substrate in its molecular structure and inhibits the enzyme activity by binding to its active site is called ....

1 point

Non competitive inhibitor

Allosteric inhibitor

Feedback inhibitor

Competitive inhibitor

Clear selection

Inhibition of succinate dehydrogenase enzyme is done by which compound, in competitive inhibition...?

1 point

Succcinate itself

Fumarate

Malonate

Coenzyme

Clear selection

Such ............ inhibitors are often used in the
control of bacterial pathogens

1 point

Non competitive inhibitor

Competitive inhibitor

Allosteric inhibitor

Feedback inhibitor

Clear selection

Succinic acid resemble in its structure with ..... regarding to inhibition...

1 point

Fumaric acid

Malonic acid

Reduced succinate

Reduced Fumarate

Clear selection

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