Biomolecules Test

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Biomolecules Test - 49

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Weekly Quiz Competition

Question 1
1 / -0

Which one is the cofactor of carbonic anhydrase?

A
Fe

B
Zn

C
Cu

D
Mg

Solution

A non protein part of enzyme which is necessary for activity of protein/enzyme is known as co factor. Mostly, inorganic ions serve as cofactors. Carbonic anhydrase catalyzed hydration of carbon dioxide into bicarbonate ions and protons. Cofactor of carbonic anhydrase is $$Zn^2+$$ ions.
Therefore, the correct answer is option B.
Question 2
1 / -0

The bases that are common in both RNA and DNA are:

A
adenine, guanine, thymine

B
adenine, uracil, cytosine

C
adenine, guanine, cytosine

D
guanine, uracil, thymine

Solution

The bases that are common in both RNA and DNA are adenine, guanine, cytosine.

In addition, Thymine is present in DNA and uracil is present in RNA.

Option C is correct.
Question 3
1 / -0

All of the following is true about enzymes except_______________.

A
Activity of enzymes remains unaffected by genetic mutation

B
Enzymes may interact with non-protein molecules in order to engage in biological activity

C
Enzymes optimally operate at a particular pH

D
Enzymes optimally operate at a particular temperature

E
Enzymes are almost always proteins
Solution
- Enzymes are proteinaceous substances that are capable of catalyzing chemical reactions of biological origin without undergoing any change.
- The activity of enzymes is the folding of a protein, they are usually sensitive to the temperature, pH, and salt concentration of the environment.
- Enzymes may interact with non-protein molecules in order to engage in biological activity.
- The activity of enzymes is affected by a genetic mutation.
So, the correct answer is option A.
Question 4
1 / -0

Which of the following is true for enzymes?
I. They are proteins.
II. Typically work best at pH 7.2.
III. They are changed during a reaction.
IV. They are formed in the nucleus only.

A
I only

B
II only

C
I and II only

D
I,II and III only

E
I, II,III and IV

Solution

Enzymes are macromolecular biological catalysts. They accelerate, or catalyze, chemical reactions.The molecules at the beginning of the process are called substrates and the enzyme converts these into different molecules, called products.
The characteristics of Enzymes:
They are proteins in nature and like all proteins, enzymes are linear chains of amino acids that fold to produce a three-dimensional structure.
Enzymes are affected by changes in pH. The most favorable pH value - the point where the enzyme is most active - is known as the optimum pH. The optimum pH value will vary greatly from one enzyme to another, however they work best at neutral pH around 7.2.
They does not change during a reaction and only accelerates the reaction.
They are generally formed via ribosomes and Endoplasmic reticulum. Therefore only 1st and 2nd statements are correct.
So, the correct answer is option A.
Question 5
1 / -0

All of the following statements is correct except

A
Enzymes are made from proteins.

B
One enzyme can facilitate the reaction of many different substrates.

C
Enzymes sometimes use induced fits to break apart their substrates.

D
Enzymes are not required for spontaneous reactions.

E
Not all catalysts are enzymes.

Solution

Enzymes are catalytic proteins. The enzymes are specific to their substrates. They act on a range of similar substrates. Enzymes work their substrate by induced fit model. In the case of spontaneous reactions, the reactions moves forward on their own. There is no requirement of enzymes to catalyse such reactions.
Thus, the correct answer is option 'One enzyme can facilitate the reaction of many different substrates'.
Question 6
1 / -0

Name the factor which will not affect the enzyme activity with a limited amount of chemical substrate.

A
pH level

B
Inhibitors

C
Temperature

D
Enzyme cofactors

E
Enzyme concentration

Solution

If the chemical substrate is present in limited quantity, enzyme concentration would not affect the rate of reaction as substrate won't be available to occupy the enzyme active sites. Hence increasing the enzyme concentration would not increase the reaction rate if substrate concentration is a limiting factor. All other factor mentioned affect the reaction rate independent of substrate concentration.
So, the correct answer is option E.
Question 7
1 / -0

Choose the correct statement about enzymes.

A
They always work alone.

B
They are consumed in a reaction.

C
They are amino acid polymers.

D
They always require a coenzyme.

E
They are classified as inorganic catalysts.

Solution

Enzymes are composed primarily of proteins, which are polymers of amino acids.
Enzymes can bind prosthetic groups that participate in enzyme reactions. Prosthetic are not part of the enzyme polypeptide chain.
Question 8
1 / -0

Helicase enzyme is responsible for the breakage of
I. Covalent bonds
II. Hydrogen bonds
III. Ionic bonds

A
I only

B
II only

C
III only

D
I and II

E
I, II, and III

Solution

Helicase enzyme moves along the double stranded DNA and separates the strands by breaking hydrogen bonds between base pairs. ATP hydrolysis provides the required energy for breaking of hydrogen bonds. it does not affect covalent bonds and ionic bonds. Thus, the correct answer is option B.
Question 9
1 / -0

_________ is the purest form of crystalline carbon.

A
Sugar Charcoal

B
Graphite

C
Diamond

D
Lamp blacek
Question 10
1 / -0

Which of the following is not true for enzymes?

A
Enzymes lower the activation energy barrier of a reaction.

B
Enzymes are made up of proteins.

C
Enzymes are used up in reactions.

D
Enzymes can be affected by changes in temperature.

E
Enzymes contain an active site.

Solution

A. Enzymes alters the speed of a chemical reaction. When reactions proceed from one direction to another, enzymes have to overcome an energy barrier to activate the inactive molecule. The amount of energy required to raise the energy of molecule at which chemical reaction can occur is called activation energy. Enzymes lower the activation energy of a reaction. Hence statement A is correct.
B. Enzymes are water soluble colloidal macromolecules which are wholly or partially proteinaceous in nature. The protein part of enzyme is called apoenzyme while the non protein part is called prosthetic group which may be coenzyme or cofactor. Hence statement B is correct.
C. Each enzyme has a substrate binding site called the active site. Binding of the substrate to this site produces a highly reactive short lived complex called enzyme substrate complex which breaks up into chemical products and unchanged enzyme along with the intermediate formation of enzyme-product complex. So, enzyme is not used up in the reactions. Hence statement C is incorrect.
D. Enzymes function best at an optimum temperature 20-40°C . The enzyme activity decreases with slight decrease or increase from the optimum temperature range. At very high temperature, enzyme activity decreases because denaturation of proteins occurs and enzyme becomes inactive. Hence statement D is correct.
E. An enzyme has a distinct cavity or cleft in which substrate is bound. This cavity is known as active site which can hold a substrate molecule by its specific size, shape etc. Hence statement E is correct.
So, the correct answer is 'Enzymes are used up in reactions'.

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Biomolecules Test - 49

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Biomolecules Test - 49

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Question 1

Fe

Zn

Cu

Mg

Solution

Question 2

adenine, guanine, thymine

adenine, uracil, cytosine

adenine, guanine, cytosine

guanine, uracil, thymine

Solution

Question 3

Activity of enzymes remains unaffected by genetic mutation

Enzymes may interact with non-protein molecules in order to engage in biological activity

Enzymes optimally operate at a particular pH

Enzymes optimally operate at a particular temperature

Enzymes are almost always proteins

Solution

Question 4

I only

II only

I and II only

I,II and III only

I, II,III and IV

Solution

Question 5

Enzymes are made from proteins.

One enzyme can facilitate the reaction of many different substrates.

Enzymes sometimes use induced fits to break apart their substrates.

Enzymes are not required for spontaneous reactions.

Not all catalysts are enzymes.

Solution

Question 6

pH level

Inhibitors

Temperature

Enzyme cofactors

Enzyme concentration

Solution

Question 7

They always work alone.

They are consumed in a reaction.

They are amino acid polymers.

They always require a coenzyme.

They are classified as inorganic catalysts.

Solution

Question 8

I only

II only

III only

I and II

I, II, and III

Solution

Question 9

Sugar Charcoal

Graphite

Diamond

Lamp blacek

Question 10

Enzymes lower the activation energy barrier of a reaction.

Enzymes are made up of proteins.

Enzymes are used up in reactions.

Enzymes can be affected by changes in temperature.

Enzymes contain an active site.

Solution

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