Biomolecules Test

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Biomolecules Test - 28

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Weekly Quiz Competition

Question 1
1 / -0

A biological catalyst is essentially

A
An amino acid

B
A carbohydrate

C
The nitrogen molecule

D
An enzyme

Solution

Enzymes are biological catalyst which increases the rate of reaction.They are generally protein in nature.
Question 2
1 / -0

The four elements that make up $$99\%$$ of all elements found in a living system are

A
C,H,O and P

B
C,H,O and S

C
C,H,O and N

D
C,N,O and P

Solution

The four most important elements found in living systems are carbon, hydrogen, oxygen and nitrogen. They make up 99% of all elements present in the cell. Molecules like proteins, carbohydrates, lipids and nucleic acids are made up of these four elements. Other elements like sodium, potassium, calcium, phosphorus etc also play a crucial role in the living system.
Thus, the correct answer is 'C,H,O and N.'
Question 3
1 / -0

Which of the following is not a genetic material?

A
ds DNA

B
ss DNA

C
ds RNA

D
None of the above

Solution

1) ds DNA is the genetic material for many organisms as seen in humans, animals, birds etc.
2) ss Dna is the single stranded DNA molecule seen in many virus groups like small pox virus, herpes virus etc.
3) ds RNA is double stranded RNA molecule seen as genetic material in rotaviruses etc
So, the correct option is 'None of the above'.
Question 4
1 / -0

Which of the following bond connects nitrogen bases to pentose sugar?

A
Phosphodiester bond

B
Glycosidic bond

C
Hydroxyl bond

D
Carbon bond

Solution

The bond that is formed between nitrogen bases to pentose sugar is a glycosidic bond because the bond is formed between a sugar and another compound. Any bond formed by a sugar is glycosidic bond.
So, the correct answer is 'Glycosidic bond'.
Question 5
1 / -0

The difference among species is due to the difference in its ________ components.

A
Carbohydrates

B
Protein

C
Lipid

D
Vitamin

Solution

In organisms the genes code for proteins. The proteins are not the same because of the variation in genes that exist within organisms of the same species due to mutation and recombination.
So, the correct answer is protein'
Question 6
1 / -0

The most important element associated with protoplasm and proteinaceous materials of plants is

A
Oxygen

B
Sulphur

C
Potassium

D
Nitrogen

Solution

Proteins are macromolecules synthesized from Nitrogen containing monomers; the amino acids. The amino acids have Nitrogen in the amino group attached to the $$\alpha$$-carbon atom. Basic amino acids have more than one amino groups present in their structure. Thus, nitrogen is the most important element required for synthesis of proteinaceous materials.
So, the correct answer is 'Nitrogen'
Question 7
1 / -0

Which of the following statements is not correct?

A
All enzymes found in cells are invariably proteins which catalyse biological reactions

B
Enzymes act efficiently at a moderate temperature and p$$^{H}$$

C
Coenzymes increase the activities of enzymes

D
Enzymes are not specific in their action on substrates

Solution

(A) Enzymes are proteins that catalyze biological reactions. Thus, the option A is correct.
(B) Enzymes act efficiently at a optimum value of temperature and pH. Thus, option B is incorrect.
(C) Co-enzymes do not increase the activities of enzymes. They help enzymes in the catalytic activity. Co-enzymes bind to the active site of the catalyst and participate in the enzyme activity. Thus, option C is incorrect.
(D) Enzymes are highly specific in their action on substrates.
Thus, option D is correct.
Question 8
1 / -0

Mark the wrong statement about enzymes

A
enzymes are biological catalysts

B
each enzyme can catalyse a number of similar reactions

C
enzymes are very efficient catalysts

D
enzymes are needed only in very small amounts for their action

Solution

Option (B) is incorrect. Enzymes are efficient and biological catalysts which are needed only in very small amounts for their action but each enzyme can catalyse only a specific selective reactions. This is often referred to as "the lock and key" model.
Question 9
1 / -0

Which of the following are the components only of a plant cell?

A
Glucose and cellulose

B
Pyruvic acid and glucose

C
Cellulose and starch

D
Starch and pyruvic acid
Solution
- Cellulose and starch both are polysaccharide carbohydrates found in plants.
- A plant cell is characterized by a cellulosic cell wall, which is dead at maturity. Cellulose is made up of glucose molecules.
- Starch is the storage polysaccharide, i.e. plants store their food in the form of starch. Starch is also made up of glucose.
So, the correct answer is 'Cellulose and starch'
Question 10
1 / -0

Inulin is a ..................... found in a plant cell.

A
Lipid

B
Protein

C
Polysaccharide

D
Vitamin

Solution

Inulin is a storage polysaccharide found in plants. It is a polymer of fructose.

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Biomolecules Test - 28

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Biomolecules Test - 28

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SHARING IS CARING

Question 1

An amino acid

A carbohydrate

The nitrogen molecule

An enzyme

Solution

Question 2

C,H,O and P

C,H,O and S

C,H,O and N

C,N,O and P

Solution

Question 3

ds DNA

ss DNA

ds RNA

None of the above

Solution

Question 4

Phosphodiester bond

Glycosidic bond

Hydroxyl bond

Carbon bond

Solution

Question 5

Carbohydrates

Protein

Lipid

Vitamin

Solution

Question 6

Oxygen

Sulphur

Potassium

Nitrogen

Solution

Question 7

All enzymes found in cells are invariably proteins which catalyse biological reactions

Enzymes act efficiently at a moderate temperature and p$$^{H}$$

Coenzymes increase the activities of enzymes

Enzymes are not specific in their action on substrates

Solution

Question 8

enzymes are biological catalysts

each enzyme can catalyse a number of similar reactions

enzymes are very efficient catalysts

enzymes are needed only in very small amounts for their action

Solution

Question 9

Glucose and cellulose

Pyruvic acid and glucose

Cellulose and starch

Starch and pyruvic acid

Solution

Question 10

Lipid

Protein

Polysaccharide

Vitamin

Solution

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