Biomolecules Test

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Biomolecules Test - 82

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Weekly Quiz Competition

Question 1
1 / -0

The given osazone can be obtained by:

A
D-glucose

B
D-mannose

C
D-Iodose

D
Both (a) & (b)

Solution
Question 2
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Amino acid having?

A
Two $${NH}_{2}$$ groups

B
One $$-COOH$$ group

C
Two $$-COOH$$ group

D
Three $$-COOH$$ groups

Solution
Question 3
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Which of the following is not an alpha-amino acid?

A
Alanine

B
Guanine

C
Glycine

D
Benzidine
Question 4
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First enzyme to be isolated in pure crystalline from was

A
Zymase

B
Urease

C
Invertase

D
Diastase

Solution

A.Zymase – enzyme involved in fermentation, first discovered by Edward Buchner.

B.Urease - catalyzes the hydrolysis of urea into ammonia and carbon dioxide. It is the enzyme first isolated by James Sumner.

C.Invertase - hat catalyzes the hydrolysis (breakdown) of sucrose (table sugar) into fructose and glucose.

D.Diastase - that catalyses the breakdown of starch into maltose.
So, the correct option is ‘Urease’.
Question 5
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Amino acids are classified as acidic, basic or neutral depending upon the relative number of amino and carboxyl groups in their molecule. Which of the following are acidic?

(i)   $$(CH_3)_2 CH - \underset{NH_2}{\underset{\!\!\!\!|}{CH}} - COOH$$

(ii)   $$HOOC - CH_2 - CH_2 - \underset{NH_2}{\underset{\!\!\!\!|}{CH}} - COOH$$

(iii)   $$NH_2 - CH_2 - CH_2 - CH_2 - COOH$$

(iv) $$HOOC - CH_2 - \underset{NH_2}{\underset{\!\!\!\!|}{CH}} - COOH$$

A
(ii) and (iv)

B
(iii) and (iv)

C
(i) and (ii)

D
(ii) and (iii)

Solution

(A) (ii) and (iv) is the correct answer.

Acidic amino acids are those which have more carboxyl groups as compared to amino groups.

Since (ii) and (iv) have two carboxyl groups versus only one amino group, they are acidic.
Question 6
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Read the statements given below and mark the correct option.

A
Apoenzymes are non- proteinaceous prosthetic groups

B
Bell- shaped curve is obtained when enzyme activity is plotted against factors such pH & temperature

C
Specificity of enzyme action is a property of tertiary structure of proteins usually

D
Enzymes increase rate of reaction by altering the equilibrium of reaction

Solution

A change in pH of enzyme catalyzed reaction markedly affects its velocity and bell shaped curve is obtained if enzyme activity is plotted against factors such as pH and temperature.
Question 7
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Which statement correctly completes the statement?
Except for glycerine, which is achiral, all the amino acids present in proteins.:

A

$$H_3 \overset{+}{N}\overset{R}{\overset{|}{C}}H CO_2H$$
are chiral, but racemic

B

$$H_2 N\overset{R}{\overset{|}{C}}HCO_2H$$
have the L configuration at their $$\alpha$$ carbon

C

$$H_3 \overset{+}{N} \overset{R}{\overset{|}{C}} H CO^-_2$$
have the R configuration at their $$\alpha$$ carbon

D

$$H_2N\overset{R}{\overset{|}{C}}H CO_2^-$$
have the S configuration at their $$\alpha$$ carbon

Solution

All amino acids naturally have L-configuration at their $$\alpha$$ -carbon , except glycerine which is achiral. Amino acids are building blocks of life. It is very much important for our body.
Question 8
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Which of the following structure is L-arabinose?

A

B

C

D

Solution

Arabinose is a monosaccharide and it is pentose sugar.
Option C is correct
Question 9
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Which of the following hormones is not a growth promoter ?

A
Cytokinin

B
Auxin

C
Gibberellin

D
Abscisic acid

Solution
Question 10
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Which failed to form osazone with excess of $$C_{6}H_{5}NHNH_{2}$$ in strongly alkaline medium?

A
D-glucose

B
D-Mannose

C
D-Xylose

D
Sucrose