Biomolecules

Q1 FREE PREVIEW

PYQ

The reagents with which glucose does not react to give the corresponding tests/products are

A. Tollen's reagent

B. Schiff's reagent

C. \(\mathrm{HCN}\)

D. \({\mathrm{NH}}_{2}\mathrm{OH}\)

E. \({\mathrm{NaHSO}}_{3}\)

Choose the correct options from the given below

[NEET 2024]

a

E and D

b

B and C

c

A and D

d

B and E

✓ Correct answer: d)

B and E

Explanation

Glucose (being an α‐hydroxy aldehyde in equilibrium) does give Tollen’s test (A), react with HCN (C) and form an oxime with NH₂OH (D). It typically does not respond to Schiff’s reagent (B) or form a stable bisulphite adduct (E). Hence, B and E are the reagents with no characteristic reaction.

Q2 FREE PREVIEW

PYQ

The reagents with which glucose does not react to give the corresponding tests/products are

A. Tollen's reagent

B. Schiff's reagent

C. \(\mathrm{HCN}\)

D. \({\mathrm{NH}}_{2}\mathrm{OH}\)

E. \({\mathrm{NaHSO}}_{3}\)

Choose the correct options from the given below:

[NEET 2024]

a

E and D

b

B and C

c

A and D

d

B and E

✓ Correct answer: d)

B and E

Explanation

Glucose (being an α‐hydroxy aldehyde in equilibrium)

does give Tollen’s test (A), react with HCN (C) and form an oxime with NH₂OH (D).
It typically does not respond to Schiff’s reagent (B) or form a stable bisulphite adduct (E).
Hence, B and E are the reagents with no characteristic reaction.

Q3

PYQ

Given below are two statements :

Statement I: Glycogen is similar to amylose in its structure.

Statement II : Glycogen is found in yeast and fungi also.

In the light of the above statements, choose the correct answer from the options given below:

[Re-NEET 2024]

a

Statement I is true but Statement II is false.

b

Statement I is false but Statement II is true.

c

Both Statement I and Statement II are true.

d

Both Statement I and Statement II are false.

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Q4

PYQ

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

[JEE Main 2021, 20 Jul (Shift 2)]

a

The action of enzymes is temperature and \(pH\) specific.

b

Enzymes are non-specific for a reaction and substrate.

c

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

d

Almost all enzymes are proteins.

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Q5

PYQ

Two monomers in maltose are:

[JEE Main 2020, 8 Jan (Shift 2)]

a

\(\alpha\)-D-glucose and \(\alpha\)-D-galactose

b

\(\alpha\)-D-glucose and \(\beta\)-D-glucose

c

\(\alpha\)-D-glucose and \(\alpha\)-D-glucose

d

\(\alpha\)-D-glucose and \(\alpha\)-D-Fructose

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Q6

PYQ

Sucrose on hydrolysis gives

a

(a) \( \beta \)-D-glucose \( +\alpha-D \)-fructose

b

(b) \( \alpha \)-D-glucose \( +\beta-D \)-glucose

c

(c) \( \alpha \)-D-glucose \( +\beta-D \)-fructose

d

(d) \( \alpha \)-D-fructose \( +\beta \)-D-fructose.

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Q7

PYQ

Which of the following is NOT an example of fibrous protein?

a

Keratin

b

Albumin

c

Collagen

d

Myosin

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Q8

PYQ

Which of the following is a basic amino acid?

a

Serine

b

Alanine

c

Tyrosine

d

Lysine

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Q9

PYQ

The incorrect statement regarding enzymes is

[NEET 2022]

a

Enzymes are very specific for a particular reaction and substrate

b

Enzymes are biocatalysts

c

Like chemical catalysts enzymes reduce the activation energy of bio process.

d

Enzymes are polysaccharides.

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Q10

PYQ

Which of the following statement is not true about glucose?

[Re-NEET 2020]

a

It contains five hydroxyl groups

b

It is a reducing sugar

c

It is an aldopentose

d

It is an aldohexose

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Q11

PYQ

Which of the following is a basic amino acid?

[NEET 2020]

a

Serine

b

Alanine

c

Tyrosine

d

Lysine

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Q12

PYQ

The RBC deficiency(Anemia), is deficiency disease of

a

Vitamin \({\mathrm{B}}_{6}\)

b

Vitamin \({\mathrm{B}}_{1}\)

c

Vitamin \({\mathrm{B}}_{2}\)

d

Vitamin \({\mathrm{B}}_{12}\)

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Q13

PYQ

Given below are two statements:
Statement I : A unit formed by the attachment of a base to 1' position of sugar is known as nucleoside.
Statement II : When nucleoside is linked to phosphorous acid at 5'-position of sugar moiety, we get nucleotide.
In the light of the above statements, choose the correct answer from the options given below:

[NEET 2023]

a

Both Statement I and Statement II are false

b

Statement I is true but Statement II is false

c

Statement I is false but Statement II is true

d

Both Statement I and Statement II are true

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Q14

PYQ

The RBC deficiency(Anemia), is deficiency disease of

[NEET 2021]

a

Vitamin \({\mathrm{B}}_{6}\)

b

Vitamin \({\mathrm{B}}_{1}\)

c

Vitamin \({\mathrm{B}}_{2}\)

d

Vitamin \({\mathrm{B}}_{12}\)

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Q15

PYQ

Deficiency of which vitamin causes osteomalacia?

[Re-NEET 2020]

a

Vitamin D

b

Vitamin K

c

Vitamin E

d

Vitamin A

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Q16

PYQ

Match List-I with List-II:

List-I (Test)	List-II (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

a

A \(\rightarrow\) I, B \(\rightarrow\) II, C \(\rightarrow\) III, D \(\rightarrow\) IV

b

A \(\rightarrow\) III, B \(\rightarrow\) IV, C \(\rightarrow\) I, D \(\rightarrow\) II

c

A \(\rightarrow\) II, B \(\rightarrow\) I, C \(\rightarrow\) III, D \(\rightarrow\) IV

d

A \(\rightarrow\) III, B \(\rightarrow\) IV, C \(\rightarrow\) II, D \(\rightarrow\) I

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