Biomolecules Test

Biomolecules Test - 42

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Biomolecules Test - 42

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Question Analysis

Biomolecules Test - 42

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Question Analysis

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Question 1

proteins

fats

carbohydrates

vitamins

Solution

Question 2

formaldehydes

secondary amines

amino acid

ammonia

Solution

Question 3

An enzyme

A carbohydrate

An amino acid

A nitrogenous base

Solution

Question 4

Cause chemical reactions that would not otherwise take place

Change the rates of chemical reactions

Change the directions of reactions

Control the equilibrium points of reactions

Solution

Question 5

Diesterase

Invertase

Zymase

Both (2) and (3)

Solution

Question 6

1 : dsDNA, 2 : ssDNA, 3 : ssRNA, 4 : ssRNA.

1 : dsDNA, 2 : ssRNA, 3 : dsDNA, 4 : ssDNA.

1 : ssDNA, 2 : dsDNA, 3 : ssRNA, 4 : dsRNA.

1 : dsDNA, 2 : ssRNA, 3 : ssDNA, 4 : ssDNA.

Question 7

cleavage of glycosidic linkage

formation of glycosidic linkage

formation of a compound containing carboxylic acid group

isomerization to glucose units

Solution

Question 8

Enzymes

Nucleotides

Nucleosides

Lipids

Question 9

Co-factors of enzymes.

Building blocks of important amino acids.

Constituent of hormones.

Binder of cell structure.

Solution

Question 10

Proteins breaking down into amino acids.

Starch breaking down into sugars.

Fats breaking down into fatty acids and glycerol.

Absorption of vitamins.

Solution

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Weekly Quiz Competition

Question 1
1 / -0

The polyhydroxy aldehydes are called:

A
proteins

B
fats

C
carbohydrates

D
vitamins
Solution
- Polyhydroxy aldehydes or ketones are molecules with more than one hydroxyl group $$(−OH)$$, and a carbonyl group $$(C=O)$$ either at the terminal carbon atom (aldose) or at the second carbon atom (ketose) are called carbohydrates.
- Monosaccharides are polyhydroxy aldehydes and are called Simple Sugar, any of the basic compounds that serve as the building blocks of carbohydrates.
Question 2
1 / -0

Proteins are the polymers of ________.

A
formaldehydes

B
secondary amines

C
amino acid

D
ammonia

Solution

Proteins are large biological molecules, or macromolecules, consisting of one or more long chains of amino acid residues.
A linear chain of amino acid residues is called a polypeptide. A protein contains at least one long polypeptide. Short polypeptides, containing less than about 20-30 residues, are rarely considered to be proteins and are commonly called peptides, or sometimes oligopeptides. The individual amino acid residues are bonded together by peptide bonds and adjacent amino acid residues.
Question 3
1 / -0

A biological catalyst is essentially

A
An enzyme

B
A carbohydrate

C
An amino acid

D
A nitrogenous base
Solution
A) Correct option (A)
B) Explanation of the correct option
- Enzymes are naturally occurring simple or conjugate proteins acting as specific catalysts in cell processes.
- The enzyme facilitates a biochemical reaction by providing alternative lower activation energy pathways thereby increasing the rate of reaction.
- Hence they are called biological catalysts.
Question 4
1 / -0

The function of an enzyme is to :

A
Cause chemical reactions that would not otherwise take place

B
Change the rates of chemical reactions

C
Change the directions of reactions

D
Control the equilibrium points of reactions
Solution
- Enzyme are protein molecule and are biological catalyst.
- Enzymes increase the rate of the reaction but equilibrium is maintained.
- Enzymes are specific, they function with only one reactant to produce specific products.
So the correct answer is option B.
Question 5
1 / -0

Which enzyme converts glucose to ethanol?

A
Diesterase

B
Invertase

C
Zymase

D
Both (2) and (3)

Solution

$$Glucose\rightarrow Ethanol$$
Zymase enzymes can do above conversion.
(catalyzes fermentation of sugar into ethanol & $$CO_2$$).
Question 6
1 / -0

Nucleic acids can be double stranded (ds) or single stranded (ss). The following table gives the composition of bases in four different nucleic acid samples.

Amount of base(%)

A
T
G
C
U
Sample 1

40
40
10
10 0
Sample 2

10
40
40
10
0
Sample 3

40
0
40
10
10
Sample 4

40
0
20
10
30
Using the information given above, it may be deduced that the samples 1, 2, 3, 4 are

A
1 : dsDNA, 2 : ssDNA, 3 : ssRNA, 4 : ssRNA.

B
1 : dsDNA, 2 : ssRNA, 3 : dsDNA, 4 : ssDNA.

C
1 : ssDNA, 2 : dsDNA, 3 : ssRNA, 4 : dsRNA.

D
1 : dsDNA, 2 : ssRNA, 3 : ssDNA, 4 : ssDNA.
Question 7
1 / -0

Sucrose doesn't respond to tollen's test. But, it gives a positive result after boiling with conc. $$HCl$$. It is due to the:

A
cleavage of glycosidic linkage

B
formation of glycosidic linkage

C
formation of a compound containing carboxylic acid group

D
isomerization to glucose units

Solution

sucrose when bonded with other molecules of sucrose forms glycosidic bond and the aldehydic group is involved in glycosidic bond, hence it is not free. Therefore negative test with tollen's raegent.

But after the reaction of conc. HCl, the glycosidic bond breaks and aldehydic group is free, hence responds to tollen's test.
Question 8
1 / -0

Metabolic processes in living organisms are catalyzed by _______.

A
Enzymes

B
Nucleotides

C
Nucleosides

D
Lipids
Question 9
1 / -0

The major role of minor elements inside living organisms is to play role of

A
Co-factors of enzymes.

B
Building blocks of important amino acids.

C
Constituent of hormones.

D
Binder of cell structure.

Solution

Micronutrients or microelements are those elements which are required in quantity of less than 10 millimole/kg of dry matter. Most of the micronutrients have a catalytic role. They are components of cofactors of enzymes, e.g., zinc (required for activity of alcohol dehydrogenase), copper (required for activity of cytochrome oxidase), nickel (required for activity of urease), etc.
Question 10
1 / -0

If salivary amylase is lacking in the saliva, what will not happen?

A
Proteins breaking down into amino acids.

B
Starch breaking down into sugars.

C
Fats breaking down into fatty acids and glycerol.

D
Absorption of vitamins.

Solution

Salivary amylase/ alpha amylase/ ptyalin is an hydrolytic enzyme that breakdown starch into maltose and dextrin. It is present in saliva. They have an optimum pH of 6.9 approximately. It is functional in basic medium only, so when it comes to stomach it becomes non functional.

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Amount of base(%)