Biomolecules — Page 9 | JEE Chemistry

Q81

Match List-I with List-II .tg .tg List - I Enzyne List - II Conversion of A. Invertase I. Starch into maltose B. Zymase II. Maltose into glucose C. Diastase III. Glucose into ethanol D. Maltase IV. Cane sugar into glucose Choose the most appropriate answer from the options given below :

A A-III, B-IV, C-II, D-I

B A-III, B-II, C-I, D-IV

C A-IV, B-III, C-I, D-II

D A-IV, B-II, C-III, D-I

Correct Answer

Option C

Solution

(A) Invertase → Cane sugar into glucose (B) Zymase → Glucose into ethanol (C) Diastase → Starch into maltose (D) Maltase → Maltose into glucose

Q82

Match List I with List II .tg .tg List I List II Test Functional group / Class of Compound A. Molisch's Test I. Peptide B. Biuret Test II. Carbohydrate C. Carbylamine Test III. Primary amine D. Schiff's Test IV. Aldehyde Choose the correct answer from the options given below :

A (A) - III, (B) - IV, (C) - II, (D) - I

B (A) - II, (B) - I, (C) - III, (D) - IV

C (A) - III, (B) - IV, (C) - I, (D) - II

D (A) - I, (B) - II, (C) - III, (D) - IV

Correct Answer

Option B

Solution

(A) Molisch test is for carbohydrates (B) Biuret test is for proteins/peptide (C) Carbylamine test is for primary amine (D) Schiff’s test is for aldehyde

Q83

Match List I with List II .tg .tg LIST I Enzymatic reaction LIST II Enzyme A. Sucrose

\to

Glocuse and Fructose I. Zymase B. Glucose

\to

ethyl alcohol and CO

_2

II. Pepsin C. Starch

\to

Maltose III. Invertase D. Proteins

\to

Amino acids IV. Diastase Choose the correct answer from the options given below:

A A-III, B-I, C-II, D-IV

B A-III, B-I, C-IV, D-II

C A-I, B-IV, C-III, D-II

D A-I, B-II, C-IV, D-III

Correct Answer

Option B

Solution

Let's match the enzymes with the corresponding reactions: The enzyme that catalyzes the hydrolysis of sucrose to glucose and fructose is invertase.

So, A matches with III.

The enzyme that catalyzes the conversion of glucose to ethyl alcohol and CO(_2) (a step in fermentation) is zymase.

So, B matches with I.

The enzyme that catalyzes the conversion of starch to maltose is diastase.

So, C matches with IV.

The enzyme that breaks down proteins into amino acids is pepsin.

So, D matches with II.

So, the correct option is: Option B A-III, B-I, C-IV, D-II

Q84

Match List I with List II .tg .tg LIST I LIST II A.

\alpha

- Glucose and

\alpha

- Galactose I. Functional isomers B.

\alpha \text{ - Glucose and } \beta \text{ - Glucose }

II. Homologous C.

\alpha \text{ - Glucose and } \alpha \text{ - Fructose }

III. Anomers D.

\alpha \text{ - Glucose and } \alpha \text{ - Ribose }

IV. Epimers Choose the correct answer from the options given below:

A A-III, B-IV, C-II, D-I

B A-IV, B-III, C-I, D-II

C A-III, B-IV, C-I, D-II

D A-IV, B-III, C-II, D-I

Correct Answer

Option B

Solution

$\alpha$ -Glucose and $\alpha$ -Galactose differ in configuration of one asymmetric carbon.

Thus they are epimers. $\alpha$ and $\beta$ -glucose differ at anomeric carbon.

Thus they are anomers.

$\alpha$ -Glucose and $\alpha$ -Fructose have different functional groups.

Thus they are functional isomers.

Q85

Match the following :

List - I		List - II
(a)	Beriberi	(i)	Riboflavin
(b)	Scurvy	(ii)	Thiamine
(c)	Cheliosis	(iii)	Pyridoxine
(d)	Convulsions	(iv)	Ascorbic acid

A (i)-(c), (ii)-(d), (iii)-(a), (iv)-(b)

B (i)-(d), (ii)-(b), (iii)-(a), (iv)-(c)

C (i)-c, (ii)-(a), (iii)-(d), (iv)-(b)

D (i)-(a), (ii)-(d), (iii)-(c), (iv)-(b)

Correct Answer

Option C

Solution

Thiamine (vitamin B1) : Beriberi Riboflavin (vitamin B2) : Cheilosis Pyridoxine (vitamin B6) : Convulsions Ascorbic acid (vitamin C) : Scurvy

Q86

During the denaturation of proteins, which of these structures will remain intact?

A Primary

B Secondary

C Tertiary

D Quaternary

Correct Answer

Option A

Solution

During the denaturation of proteins hydrogen bonds are disturbed.

As a result, the secondary and tertiary structures are destroyed but the primary structures remain intact.

Q87

The

\alpha

-Helix and

\beta

- Pleated sheet structures of protein are associated with its :

A tertiary structure

B quaternary structure

C primary structure

D secondary structure

Correct Answer

Option D

Solution

$\alpha$ -helix and $\beta$ -pleated sheet belongs to secondary structure of protein, which have hydrogen bonds.

Q88

Which of the following statement is not true for glucose?

A Glucose gives Schiff's test for aldehyde

B Glucosse reacts with hydroxylamine to form oxime

C The pentaacetate of glucose does not react with hydroxylamine to give oxime

D Glucose exists in two crystalline forms

\alpha

and

\beta

Correct Answer

Option A

Solution

Glucose gives negative test with Schiff reagent.

Q89

Identify the incorrect statement from the following

A Amylose is a branched chain polymer of glucose

B Starch is a polymer of

\alpha

-D glucose

C

\beta

-Glycosidic linkage makes cellulose polymer

D Glycogen is called as animal starch

Correct Answer

Option A

Solution

Amylose is a linear chain polymer of $\alpha$ -D-glucose while amylopectine is branched chain polymer of $\alpha$ -D-glucose.

Q90

Which one of the following statements is not true about enzymes?

A Enzymes are non-specific for a reaction and substrate.

B Almost all enzymes are proteins.

C Enzymes work as catalysts by lowering the activation energy of a biochemical reaction.

D The action of enzymes is temperature and pH specific.

Correct Answer

Option A

Solution

Enzymes are mostly proteins.

They function as catalysts in biochemical reactions by lowering the energy of activation.

They are highly specific w.r.t. temperature and pH in their action.