Biomolecules Test

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Biomolecules Test - 56

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Question 1
1 / -0

$$K_m$$ is

A
Product

B
Enzyme

C
Constant

D
Unit

Solution

Km is the Michaelis constant in the enzyme activity. It is the substrate concentration at the half Vmax. The size of the Km determines the enzyme action such as small Km indicates at low substrate is required for maximum velocity of enzyme reaction and large Km indicates high substrate concentration is needed to achieve maximum velocity.
Question 2
1 / -0

Enzymes are __________.

A
biological catalyst

B
soluble proteins with higher molecular mass

C
in living systems, the reaction catalyzed by a group of biomolecules

D
all of these

Solution

Enzymes are biological catalysts used for the various biochemical reaction. Presence of enzymes speeds of the reaction to a very large extent. Enzymes help in digestion of food and they are very vital for life. All enzymes are proteins
eg: $$C_{12}H_{22}O_{11}$$ (maltose)\rightarrow $$C_6H_{12}O_6$$ (glucose),in presence of enzyme maltase. enzymes are required in very small quantities as they act as a catalyst.
Question 3
1 / -0

Which of the following hormone controls the metabolism of glucose and maintains glucose level in the blood?

A
Insulin

B
Cortisone

C
Oxytocin

D
Estrogens

Solution

Insulin controls the metabolism of glucose and maintains glucose level in the blood. Insulin is a peptide hormone and is secreted in pancreas.
Question 4
1 / -0

Of the following statements about enzymes, which ones are true?
(i) enzymes lack in nucleophilic groups
(ii) enzymes are highly specific both in binding chiral substrates and in catalyzing their reactions
(iii) enzymes catalyze chemical reactions by lowering the activation energy
(iv) pepsin in proteolytic enzyme

A
(i)

B
(i) and (iv)

C
(i) and (iii)

D
(ii), (iii) and (iv)

Solution

As properties of an enzyme are:
(i) They don't initiate the catalysis by accelerating the rate of catalysis by lowering the activation energy.
(ii) A particular enzyme attacks on a particular substrate (it fits like a key in the lock).
(iii) Any enzyme which breaks the long chain molecules of proteins into shorter fragments (peptides) and eventually into their components, amino acids called proteolytic enzyme.
Pepsin is such an example.
Question 5
1 / -0

Which enzyme hydrolysis triglyceride to fatty acids and glycerol?

A
Lipase

B
Maltase

C
Amylase

D
Pepsin

Solution

Lipase react with triglyceride and catalyse it in the diglyceride and finally in monoglyceride.
Question 6
1 / -0

Which of the following is the prosthetic group in chromoproteins?

A
Pigment having some metals

B
Nuleic acids

C
Sugars

D
Lipids such as lecithin

Solution

The pigment having some metals is the prosthetic group in chromoproteins.
Nucleic acids are prosthetic groups in nucleoproteins.
Sugars are prosthetic groups in glycoproteins.
Lipids such as lecithin are prosthetic groups in lipo proteins.
Question 7
1 / -0

Which of the following enzyme(s) is/are responsible for the hydrolysis of proteins to amino acids?

A
Pepsin

B
Trypsin

C
Both of the above

D
Invertase

Solution

Pepsin and Trypsin are responsible for the hydrolysis of proteins to amino acids. Invertase is responsible for the hydrolysis of sucrose to glucose and fructose.
Question 8
1 / -0

Urease is :

A
a vitamin

B
an enzyme

C
a protein

D
an amino acid

Solution

Except for some of the originally studied enzymes such as pepsin, rennin, and trypsin,Acc. to IUB most enzyme names end in "ase".
So Urease also an enzyme that catalyzes the hydrolysis of urea.
Question 9
1 / -0

Enzymes :

A
accelerate bio-chemical reactions

B
consists of amino acids

C
have optimum activity at body temperature

D
have all these properties

Solution

Enzymes:
(i) Are proteins that catalyze the biochemical reactions
(ii) They consist of amino acids.
(iii) Have optimum activity at body temperature.
Therefore, optimal temperature is usually around human body temperature $$(37.5^oC)$$
Question 10
1 / -0

Cyanocobalamine is:

A
vitamin B$$_{12}$$

B
nucleic acid

C
hormone

D
polysaccharide

Solution

Cyanocobalamine is Vitamin B$$_{12}$$. It is water soluble. Its deficiency causes pernicious anaemia, inflammation of tongue and mouth.

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Biomolecules Test - 56

Result

Biomolecules Test - 56

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SHARING IS CARING

Question 1

Product

Enzyme

Constant

Unit

Solution

Question 2

biological catalyst

soluble proteins with higher molecular mass

in living systems, the reaction catalyzed by a group of biomolecules

all of these

Solution

Question 3

Insulin

Cortisone

Oxytocin

Estrogens

Solution

Question 4

(i)

(i) and (iv)

(i) and (iii)

(ii), (iii) and (iv)

Solution

Question 5

Lipase

Maltase

Amylase

Pepsin

Solution

Question 6

Pigment having some metals

Nuleic acids

Sugars

Lipids such as lecithin

Solution

Question 7

Pepsin

Trypsin

Both of the above

Invertase

Solution

Question 8

a vitamin

an enzyme

a protein

an amino acid

Solution

Question 9

accelerate bio-chemical reactions

consists of amino acids

have optimum activity at body temperature

have all these properties

Solution

Question 10

vitamin B$$_{12}$$

nucleic acid

hormone

polysaccharide

Solution

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