Biomolecules Test

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Biomolecules Test - 72

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Question 1
1 / -0

Nonprotein part of enzyme is

A
Catalytic agent

B
Cofactor

C
Active site

D
Apoenzyme

Solution

A cofactor is a non-protein chemical compound that is bound i.e, cofactors are non-protein organic molecules that are mostly derivatives of vitamins soluble in water by phosphorylation; they bind apoenzyme to proteins to produce an active holoenzyme. Cofactors can be considered as "helper molecules" that assist in biochemical transformations. So, the correct answer is option B.
Question 2
1 / -0

Enzymes increase the rate of biochemical reaction through

A
Changing equilibrium

B
Lowering activation energy

C
Forming reactant-product complex

D
Forming enzyme-product complex.

Solution

Enzymes are biological catalysts. A catalyst is a chemical that increases the rate of a chemical reaction without itself being changed by the reaction. Without a catalyst, the amount of energy required for the reaction is large. Enzymes and catalysts both affect the rate of a reaction. The lower the activation energy for a reaction, the faster the rate of chemical reaction. Thus enzymes speed up reactions by lowering activation energy.
So, the correct answer is option B.
Question 3
1 / -0

The enzyme which combines with a nonprotein prosthetic group to form a functional enzyme is called

A
Apoenzyme

B
Holoenzyme

C
Coenzyme

D
Proenzyme.

Solution

The non-protein component or prosthetic group along with the protein component or apoenzyme is called the holoenzyme. The prosthetic group may be metal ion or a co-enzyme that may be firmly or losely bound to the enzyme.
So, the correct answer is option B.
Question 4
1 / -0

Enzyme amylase belongs to category

A
Oxidoreductases

B
Transferases

C
Hydrolases

D
Isomerases

Solution

An amylase is an enzyme that catalyses the hydrolysis of starch into sugars. A hydrolase or hydrolytic enzyme is an enzyme that catalyzes the hydrolysis of a chemical bond. So, the correct answer is option C.
Question 5
1 / -0

Which one is the major globin present in adult human being

A
$$\alpha_2, \beta_2$$

B
$$\alpha_2, \varepsilon_2$$

C
$$\alpha_2, \gamma_2$$

D
$$\alpha_2, \varepsilon_2$$.

Solution

Beta globin is a globin protein, which along with alpha globin (HBA), makes up the most common form of haemoglobin in adult humans, the HbA. It is 146 amino acids long and has a molecular weight of 15,867 Da. Hb A (α2β2) is the major component of hemoglobin in normal adults, usually comprising about 97% of the total hemoglobin.
So, the correct answer is '$${α}_{2},{β}_{2}$$.'
Question 6
1 / -0

Percentage of $$\alpha_2, \beta_2$$ globin present in human adult is

A
99%

B
99.5%

C
98%

D
97%

Solution

In adult life, Hb A ($${α}_{2}{β}_{2}$$) makes up about 97% of the total hemoglobin, the remaining 2% to 3% being represented by Hb $${A}_{2}$$ and a small amount of Hb F.
So, the correct answer is '97%.'
Question 7
1 / -0

Foetal globin is

A
$$\zeta_2 \gamma_2$$

B
$$\alpha_2 \varepsilon_2$$

C
$$\alpha_2 \gamma_2$$

D
$$\alpha_2 \delta_2$$

Solution

Hemoglobin F (also known as fetal hemoglobin or HbF, α2γ2) is a major contributor to the clinical heterogeneity observed in patients with the major β-globin disorders, sickle cell disease (SCD) and β-thalassemia.
So, the correct answer is '$${α}_{2}{γ}_{2}$$.'
Question 8
1 / -0

Percentage of foetal protein present in human adult is

A
1%

B
2%

C
3%

D
None of the above.

Solution

AFP is the most abundant plasma protein found in the human fetus. Maternal plasma levels peak near the end of the first trimester, and begin decreasing prenatally at that time, then decrease rapidly after birth. Normal adult levels contain 1% which are usually achieved by the age of 8 to 12 months.
So, the correct answer is '1%.'
Question 9
1 / -0

Compunds structurally similar to substrate and inducing enzyme synthesis are

A
Constitutive enzymes

B
Gratuitous inducer

C
Coordinated inducers

D
None of the above

Solution

Gratuitous inducers resemble authentic inducers of transcription but are not substrates for the induced enzymes. It can initiate transcription when the original inducer is absent. Iso-proppylthiogalactoside (IPTG) is used as an inducer in the lac operon when the lactose and allolactose are used up. It acts as non metabolized inducer.
So, the correct answer is option B.
Question 10
1 / -0

Enzymes catalysing removal of group and formation of double bonds are

A
Ligases

B
Lyases

C
Transferases

D
Oxidoreductases

Solution

Lyases is an enzyme which catalyses the joining of specified molecules or groups by a double bond. Lyases catalyze reactions where functional groups are added to break double bonds in molecules or the reverse where double bonds are formed by the removal of functional groups. So, the correct answer is option B.

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Re-Attempt Weekly Quiz Competition

Biomolecules Test - 72

Result

Biomolecules Test - 72

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SHARING IS CARING

Question 1

Catalytic agent

Cofactor

Active site

Apoenzyme

Solution

Question 2

Changing equilibrium

Lowering activation energy

Forming reactant-product complex

Forming enzyme-product complex.

Solution

Question 3

Apoenzyme

Holoenzyme

Coenzyme

Proenzyme.

Solution

Question 4

Oxidoreductases

Transferases

Hydrolases

Isomerases

Solution

Question 5

$$\alpha_2, \beta_2$$

$$\alpha_2, \varepsilon_2$$

$$\alpha_2, \gamma_2$$

$$\alpha_2, \varepsilon_2$$.

Solution

Question 6

99%

99.5%

98%

97%

Solution

Question 7

$$\zeta_2 \gamma_2$$

$$\alpha_2 \varepsilon_2$$

$$\alpha_2 \gamma_2$$

$$\alpha_2 \delta_2$$

Solution

Question 8

1%

2%

3%

None of the above.

Solution

Question 9

Constitutive enzymes

Gratuitous inducer

Coordinated inducers

None of the above

Solution

Question 10

Ligases

Lyases

Transferases

Oxidoreductases

Solution

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