Biomolecules Test

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Biomolecules Test - 80

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Weekly Quiz Competition

Question 1
1 / -0

Catabolic and anabolic pathways are often coupled in cell because

A
Both the paths have the same energy

B
The free energy released from one pathway is used to drive other

C
The intermediates of a catabolic pathway are used in the anabolic pathway

D
Their enzymes are controlled by their activators and inhibitors.
Solution
- Anabolic pathways are those that require energy to synthesize larger molecules. Catabolic pathways are those that generate energy by breaking down larger molecules. Both types of pathways are required for maintaining the cell's energy balance.
- Catabolic and anabolic pathway are coupled because catabolic reactions furnish the energy required for anabolism. Catabolic reactions transfer energy from complex molecules to ATP. Anabolic reactions transfer energy from ATP to complex molecules.
- Hence Catabolic and anabolic pathways are often coupled in the cell because the free energy released from one pathway is used to drive other.
- So, the correct answer is 'the free energy released from one pathway is used to drive other'.
Question 2
1 / -0

Mark the wrong statement

A
Zinc is a cofactor for proteolytic enzyme carboxypeptidase

B
$$K_m$$ (Michaelis Constant) is numerically equivalent to 1/2 Vmax

C
Strands of DNA appear like a helical staircase. At each step of ascent, strand turns $$36^o$$.

D
Tyrosine, Phenylalanine and Tryptophan are aromatic amino acids.

Solution

A) Carboxypeptidase is a protease enzyme. It is secreted by the pancreas. This enzyme hydrolyzes the peptide bond present in the proteins. To enhance the rate of reactions, Zn act as a cofactor for carboxypeptidase.
B) Km is the concentration of the substrate, which permits the enzyme to achieve the half Vmax. K_m(Michaelis Constant) is numerically equivalent to 1/2 V_max.
_{C) Strands of DNA appear like a helical staircase. At each step of ascent, strands turn $$36^o$$}
_{D) Tyrosine, Phenylalanine, and tryptophan are aromatic amino acids.}
_{So, all the statements are correct.}
Question 3
1 / -0

In the figure given below , percentage composition of biomolecules in living tissue is shown. Phospholipids are likely to be obtained in the fraction labelled.

A
$$Y,J$$

B
$$Z,K$$

C
$$W$$

D
$$L$$

Solution

The living tissues has the following composition of the bio-molecules:
Water- 65% (represented by the fraction K)
Nucleic acids 3% (represented by fraction J)
Minerals 3%(represented by fraction L)
Lipids 8% (represented by fraction W)
Saccharides 9% (represented by fraction Z)
Proteins 12% (represented by fraction Y)
Hence, the correct answer is 'W'
Question 4
1 / -0

An organic compound has a triple bond and double bond. It can be tested by :

A
Bromine water

B
Beyer's reagents

C
Fehling's solution

D
Ammonical $$AgNO_3$$

Solution

The bromine test is a qualitative test for the presence of unsaturation (carbon-to-carbon double or triple bonds) and phenols. An unknown sample is treated with a small amount of elemental bromine in an organic solvent, being as dichloromethane or carbon tetrachloride. Presence of unsaturation and/or phenol in the sample is shown by disappearance of the deep brown coloration of bromine when it has reacted with the unknown sample.
So, the correct option is 'Bromine water'.
Question 5
1 / -0

Biological organisation begins at

A
Cellular level

B
Atomic level

C
Organismic level

D
Submicroscopic molecular level
Solution
- The biological organization starts with the submicroscopic molecular level, where four types of molecules, i.e. carbohydrates, lipids, proteins, and nucleic acid are organized into organelles of the cell.
- Hence Biological organization begins at Submicroscopic molecular level.
- So, the correct answer is 'Submicroscopic molecular level'.
Question 6
1 / -0

Chemically vinegar is

A
Amino acid

B
Acetic acid

C
Gluconic acid

D
Lactic acid

Solution

Chemically vinegar is acetic acid as it has a formula of CH$$_3$$COOH.
So, the correct answer is 'Acetic acid'.
Question 7
1 / -0

Which of the following chemical unit is certainly found in an enzyme?

A

B

C
$$.... \overset{H\!}{\overset{|}{N}} - \overset{O}{\overset{||}{C}} ....$$

D

Solution

Since all enzymes are proteins, and protein contain peptide linkage. Thus, all enzymes certainly contain peptide linkage.
The peptide linkage is given as: $$-\overset{\overset{O}{||}}C-\overset{\overset{H}{|}}N-$$
Question 8
1 / -0

What is common between NAD and FAD?

A
Both are coenzymes

B
Both are derived from proteins

C
Both acts as oxygen carriers

D
All of the above

Solution

Nicotinamide Adenine Dinucleotide (NAD) and Flavin Adenine Dinucleotide (FAD) are coenzymes associated with reversible oxidation and decrease reactions. Then, these lessened coenzymes can give these electrons to some other biochemical response ordinarily engaged with a procedure that is anabolic (like the union of ATP).
So, the correct option is 'Both are coenzymes'.
Question 9
1 / -0

Which metal ion is present as cofactor in carboxypeptidase ?

A
$$Zn^{++} $$

B
$$Mn^{++}$$

C
$$Cl^-$$

D
Nl

Solution

Carboxypeptidase commonly called as CPA plays an important role in the metabolism of protein. It contains zinc ion as cofactor which helps in hydrolyzes of carbon in COOH group present on one of the terminals of amino acids. Loss of this $$Zn+2$$ ion will destroy the enzymatic activity of CPA as enzyme commonly follow the lock and key mechanisms which demands unaltered structures.
So, the correct answer is " $$Zn+2$$ ".
Question 10
1 / -0

Synthesis of each molecule of glucose in photosynthesis inovolves :-

A
$$18$$ molecules of $$ATP$$

B
$$10$$ molecules of $$ATP$$

C
$$8$$ molecules of $$ATP$$

D
$$6$$ molecules of $$ATP$$

Solution

Synthesis of glucose from photosynthesis involves 18 moles of ATP
The reaction involves are
$$ 6CO_{2}+12NADP.2H+18ATP\rightarrow C_{6}H_{12}O_{6}+18P+12NADP+18ADP $$

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Biomolecules Test - 80

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Biomolecules Test - 80

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Question 1

Both the paths have the same energy

The free energy released from one pathway is used to drive other

The intermediates of a catabolic pathway are used in the anabolic pathway

Their enzymes are controlled by their activators and inhibitors.

Solution

Question 2

Zinc is a cofactor for proteolytic enzyme carboxypeptidase

$$K_m$$ (Michaelis Constant) is numerically equivalent to 1/2 Vmax

Strands of DNA appear like a helical staircase. At each step of ascent, strand turns $$36^o$$.

Tyrosine, Phenylalanine and Tryptophan are aromatic amino acids.

Solution

Question 3

$$Y,J$$

$$Z,K$$

$$W$$

$$L$$

Solution

Question 4

Bromine water

Beyer's reagents

Fehling's solution

Ammonical $$AgNO_3$$

Solution

Question 5

Cellular level

Atomic level

Organismic level

Submicroscopic molecular level

Solution

Question 6

Amino acid

Acetic acid

Gluconic acid

Lactic acid

Solution

Question 7

$$.... \overset{H\!}{\overset{|}{N}} - \overset{O}{\overset{||}{C}} ....$$

Solution

Question 8

Both are coenzymes

Both are derived from proteins

Both acts as oxygen carriers

All of the above

Solution

Question 9

$$Zn^{++} $$

$$Mn^{++}$$

$$Cl^-$$

Nl

Solution

Question 10

$$18$$ molecules of $$ATP$$

$$10$$ molecules of $$ATP$$

$$8$$ molecules of $$ATP$$

$$6$$ molecules of $$ATP$$

Solution

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