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NEET • BIOLOGY • BIOMOLECULES

Biomolecules practice · Hard

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31 Hard

31 of 91

Understanding +4 | -1

Phosphodiester bond is formed between

View answer and explanation

Correct option: C

{3^1}

carbon of sugar of one nucleotide and

{5^1}

carbon of sugar of another nucleotide

Option C (

{3^1}

carbon of sugar of one nucleotide and

{5^1}

carbon of sugar of another nucleotide) is correct because a phosphodiester bond links the 3' carbon of one nucleotide's sugar to the 5' carbon of the next nucleotide's sugar.

32 Hard

32 of 91

Remembering +4 | -1

Cellulose is

View answer and explanation

Correct option: B

Homo polysaccharide

Option B (Homo polysaccharide) is correct because cellulose is made up of only one type of monosaccharide (glucose), making it a homopolysaccharide.

33 Hard

33 of 91

Remembering +4 | -1

The acid used for preliminary separation of biomolecule in a living tissue is

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Correct option: C

Trichloro acetic acid

Option C (Trichloro acetic acid) is correct because trichloroacetic acid (TCA) is commonly used for the preliminary separation of biomolecules in living tissues.

34 Hard

34 of 91

Understanding +4 | -1

Cellulose does not form blue colour with Iodine because

View answer and explanation

Correct option: A

It does not contain complex helices and hence cannot hold iodine molecules

Option A (It does not contain complex helices and hence cannot hold iodine molecules) is correct because cellulose lacks the helical structure necessary to trap iodine molecules, unlike starch.

35 Hard

35 of 91

Understanding +4 | -1

The correct arrangement of these biomolecules in increasing order of their molecular weight is

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Correct option: C

AMP, ADP, ATP, DNA

Option C (AMP, ADP, ATP, DNA) is correct because the molecular weight increases with the addition of phosphate groups, and DNA is a large polymer.

36 Hard

36 of 91

Understanding +4 | -1

Assertion (A): In solutions of different pH, the structure of amino acids changes.

Reason (R): A particular property of amino acids is the ionizable nature of

-\mathrm{NH}_2

and -COOH groups.

View answer and explanation

Correct option: A

Both (A) & (R) are true and the (R) is the correct explanation of the (A)

The correct answer is A because the structure of amino acids changes with pH due to the ionizable nature of the amino and carboxyl groups.

37 Hard

37 of 91

Remembering +4 | -1

Which of the following is the toxin?

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Correct option: B

Abrin

Option B (Abrin) is correct because Abrin is a highly toxic protein found in the seeds of the rosary pea.

38 Hard

38 of 91

Analyzing +4 | -1

Assertion (A): Coenzymes are proteinous structures without which certain enzymes are inactive
Reason (R): Coenzymes are tightly bound to apoenzymes

View answer and explanation

Correct option: D

Both A and R are incorrect

Option D is correct because coenzymes are non-protein organic molecules, and they are loosely bound to apoenzymes, not tightly bound.

39 Hard

39 of 91

Remembering +4 | -1

The high energy bonds of ATP are present between:

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Correct option: D

\mathrm{O}-\mathrm{P}

Option D (

\mathrm{O}-\mathrm{P}

) is correct because the high-energy bonds in ATP are the phosphoanhydride bonds between the phosphate groups, which are O-P bonds.

40 Hard

40 of 91

Remembering +4 | -1

The type of bond formed between hydrodeyl group of sugar and phosphate is

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Correct option: A

ester bond

Option A (ester bond) is correct because an ester bond is formed between a hydroxyl group of sugar and a phosphate group.

41 Hard

41 of 91

Understanding +4 | -1

Assertion (A): Adenine and Guanine are substituted purines.

Reason (R): In Adenine and Guanine purine heterocyclic ring has either amino or amino and oxy groups.

View answer and explanation

Correct option: A

Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Option A is correct because both the assertion and reason are true, and the reason correctly explains why Adenine and Guanine are substituted purines.

42 Hard

42 of 91

Remembering +4 | -1

The charged molecule which is electrically neutral is known as

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Correct option: B

Zwitterion

Option B (Zwitterion) is correct because a zwitterion is a molecule that contains both positive and negative electrical charges, resulting in an overall neutral charge.

43 Hard

43 of 91

Analyzing +4 | -1

The figure shows a hypothetical tetrapeptide portion of a
protein with parts labelled A-D. Which one of the following
option is correct?

View answer and explanation

Correct option: B

D is the acidic amino acid - glutamic acid

Option B (D is the acidic amino acid - glutamic acid) is correct because the structure of D, with a carboxylic acid group in the side chain, indicates it is an acidic amino acid, specifically glutamic acid.

44 Hard

44 of 91

Remembering +4 | -1

When the temperature is increased by

10^\circ C

the rate of a reaction increases?

View answer and explanation

Correct option: A

2 times

Option A (2 times) is correct because, as a general rule of thumb, the rate of a reaction approximately doubles for every 10°C increase in temperature.

45 Hard

45 of 91

Understanding +4 | -1

Malonate inhibits succinate dehydrogenase, is an example of

View answer and explanation

Correct option: C

Competitive inhibition

Option C (Competitive inhibition) is correct because malonate resembles succinate and competes for the active site of succinate dehydrogenase.

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46 Hard

46 of 91

Analyzing +4 | -1

Which of the following is not correctly matched with its category?

View answer and explanation

Correct option: A

Insulin - Carbohydrate

Option A (Insulin - Carbohydrate) is not correctly matched because insulin is a protein hormone, not a carbohydrate.

47 Hard

47 of 91

Understanding +4 | -1

Given below are two statements:

Statement I: A protein is imagined as a line, the left end represented by first amino acid (C-terminal) and the right end represented by last amino acid (N-terminal).

Statement II: Adult human haemoglobin, consists of 4 subunits (two subunits of

\alpha

type and two subunits of

\beta

type.)

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

View answer and explanation

Correct option: B

Statement I is false but Statement II is true

Option B is correct because Statement I is false (protein's left end is N-terminal and right end is C-terminal), and Statement II is true (adult hemoglobin has two alpha and two beta subunits).

48 Hard

48 of 91

Remembering +4 | -1

Glutamic acid is represented by the single letter code ______

View answer and explanation

Correct option: D

Option D (E) is correct because the single-letter code for glutamic acid is E.

49 Hard

49 of 91

Remembering +4 | -1

The type of bond involved in the formation of sodium chloride, is

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Correct option: C

Ionic bond

Option C (Ionic bond) is correct because sodium chloride (NaCl) is formed through the transfer of an electron from sodium to chlorine, resulting in an ionic bond.

50 Hard

50 of 91

Understanding +4 | -1

Malonic acid is a competitive inhibitor for?

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Correct option: C

Succinic acid

Option C is correct because malonic acid is a structural analog of succinic acid and competitively inhibits succinate dehydrogenase in the citric acid cycle.

51 Hard

51 of 91

Remembering +4 | -1

Concanavalin A is

View answer and explanation

Correct option: B

a lectin

Option B (a lectin) is correct because Concanavalin A is a well-known lectin, which is a carbohydrate-binding protein.

52 Hard

52 of 91

Understanding +4 | -1

Select the True-False statements from the following.

A. Protein is homo-polymer of amino acid.

B. Protein transports the nutrients through cytoplasmic membrane.

C. Except ‘R’ group remaining is same in the amino acid.
D. Two similar amino acids join to form dipeptide.

View answer and explanation

Correct option: D

FTTF

Option D is correct because protein is a heteropolymer, transports nutrients, the R group varies, and two similar amino acids do not necessarily form a dipeptide.

53 Hard

53 of 91

Remembering +4 | -1

Which of the following polysaccharide is a component of paper?

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Correct option: C

Cellulose

Option C (Cellulose) is correct because cellulose is a major component of paper, providing its structural integrity.

54 Hard

54 of 91

Understanding +4 | -1

Identify wheather the given statements are true or false
I. A protozoan contains thousand of organic compounds
II. Concentration of biomolecules in an organism is not fixed

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Correct option: C

I-True; II-False

Option C is correct because the concentration of biomolecules in an organism is relatively fixed.

55 Hard

55 of 91

Remembering +4 | -1

Which of these options is categorized as a lectin?

View answer and explanation

Correct option: C

Concanavalin A

Option C (Concanavalin A) is correct because Concanavalin A is a well-known lectin, a carbohydrate-binding protein.

56 Hard

56 of 91

Understanding +4 | -1

An example of feedback inhibition is

View answer and explanation

Correct option: C

Allosteric inhibition of hexokinase by glucose 6-phosphate

Option C (Allosteric inhibition of hexokinase by glucose 6-phosphate) is correct because it exemplifies feedback inhibition where the product of a pathway inhibits an earlier enzyme in the same pathway.

57 Hard

57 of 91

Remembering +4 | -1

Nucleosides form one of the precursor in the formation of the genetic material within the living system. What is the composition of nucleoside?

View answer and explanation

Correct option: A

Five carbon sugar molecule, nitrogen base only

Option A (Five carbon sugar molecule, nitrogen base only) is correct because a nucleoside is composed of a five-carbon sugar (ribose or deoxyribose) and a nitrogenous base.

58 Hard

58 of 91

Remembering +4 | -1

The most abundant component of a cell after water is

View answer and explanation

Correct option: D

Protein

Option D (Protein) is correct because, after water, proteins are the most abundant organic molecules in a cell, playing crucial roles in structure, function, and regulation.

59 Hard

59 of 91

Understanding +4 | -1

Ammonia is very toxic to brain cells. This is immediately trapped in brain by one of the following mechanisms.

View answer and explanation

Correct option: A

Glutamine synthetase reaction

Option A (Glutamine synthetase reaction) is correct because this reaction traps ammonia by converting glutamate to glutamine, preventing its toxic effects on brain cells.

60 Hard

60 of 91

Understanding +4 | -1

Arrange the intermediary products formed during the process of digestion of proteins

I. Peptones

II. Amino acids

III. Polypeptides

IV. Proteins

V. Tripeptides

VI. Dipeptides

View answer and explanation

Correct option: A

IV - III - I - V - VI - II

Option A is correct because the digestion of proteins proceeds from proteins to polypeptides, peptones, tripeptides, dipeptides, and finally amino acids.

Revision notes and key takeaways

Review BIOMOLECULES in your textbook or class notes, then use this set to check your understanding.

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