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NEET • BIOLOGY • BIOMOLECULES

Biomolecules practice · Easy

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Showing 1-30 of 98 questions

1 Easy

1 of 98

Understanding +4 | -1

Choose the correct statement w.r.t. proteins

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Correct option: C

GLUT – 4 is a transporter which enables glucose transport into cells

Option C is correct because GLUT-4 is a glucose transporter protein that facilitates glucose uptake into cells.

2 Easy

2 of 98

Understanding +4 | -1

Grinding of a living tissue in trichloroacetic acid shows the presence of the inorganic compounds like sulphate, phosphate etc, which are categorised in

View answer and explanation

Correct option: B

Acid soluble fraction

Option B (Acid soluble fraction) is correct because inorganic compounds are generally smaller and dissolve in the acid solution.

3 Easy

3 of 98

Remembering +4 | -1

Which of the following is an essential amino acids?

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Correct option: D

All of these

Option D is correct because Valine, Leucine, and Tryptophan are all essential amino acids.

4 Easy

4 of 98

Understanding +4 | -1

A fatty acid has a carboxyl group attached to R group. The R group could be a

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Correct option: D

All of the above

Option D (All of the above) is correct because the R group in a fatty acid can be a methyl, ethyl, or a higher number of

-\mathrm{C}{\mathrm{H}_2}

groups.

5 Easy

5 of 98

Analyzing +4 | -1

On comparing the proportion of elements found in human tissue and Earth’s crust, which one of the following is found to be negligible?

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Correct option: A

Silicon

Option A (Silicon) is correct because the proportion of silicon is much higher in the Earth's crust compared to human tissue.

6 Easy

6 of 98

Remembering +4 | -1

Name the four elements called ‘Big-four’ which make up 95% of all elements found in a living system

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Correct option: B

C, H, O, N

Option B (C, H, O, N) is correct because carbon, hydrogen, oxygen, and nitrogen are the most abundant elements in living systems, making up about 95% of their mass.

7 Easy

7 of 98

Understanding +4 | -1

ATP differs from adenylic acid in

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Correct option: A

Having 2 additional phosphate molecule

Option A (Having 2 additional phosphate molecule) is correct because ATP (Adenosine Triphosphate) has three phosphate groups, while adenylic acid (AMP - Adenosine Monophosphate) has only one.

8 Easy

8 of 98

Remembering +4 | -1

Proteins with catalytic power are known as

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Correct option: C

Enzymes

Option C (Enzymes) is correct because enzymes are proteins that catalyze biochemical reactions.

9 Easy

9 of 98

Remembering +4 | -1

Choose correct set of primary metabolites.

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Correct option: D

Tyrosine and chlorophyll

Option B (Glucose and cellulose) is correct because both are directly involved in essential metabolic processes and structural components in organisms.

10 Easy

10 of 98

Understanding +4 | -1

Acidic amino acids carry two -COOH and one

- \mathrm{N}{\mathrm{H}_2}

groups per molecule. Keeping this in mind, select the correct pair of acidic amino acid

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Correct option: B

Aspartic acid and glutamic acid

Option B (Aspartic acid and glutamic acid) is correct because they are the two common amino acids with acidic side chains (containing an extra -COOH group).

11 Easy

11 of 98

Remembering +4 | -1

The regulation of the chemical composition of blood and body fluids and other aspects of its internal environment by an organism to maintain the physiological process is called

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Correct option: C

Homeostasis

Option C (Homeostasis) is correct because homeostasis is the maintenance of a stable internal environment.

12 Easy

12 of 98

Remembering +4 | -1

What provides roughage (fibre) in our diet?

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Correct option: A

Cellulose

Option A (Cellulose) is correct because cellulose is a major component of plant cell walls and provides fiber in our diet.

13 Easy

13 of 98

Remembering +4 | -1

Enzymes catalyses the biochemical reactions by …… the activation energy

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Correct option: B

Lowering

Option B (Lowering) is correct because enzymes catalyze reactions by lowering the activation energy required for the reaction to proceed.

14 Easy

14 of 98

Remembering +4 | -1

Arachidonic acid is

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Correct option: D

Both (b) and (c )

Option D (Both (b) and (c )) is correct because arachidonic acid is both an essential and a polyunsaturated fatty acid.

15 Easy

15 of 98

Understanding +4 | -1

Assertion: Starch forms complex with

{I_2}

.
Reason: Starch forms secondary helical structure

View answer and explanation

Correct option: A

If both the assertion and the reason are true and the
reason is a correct explanation of the
assertion

Option A (If both the assertion and the reason are true and the reason is a correct explanation of the assertion) is correct because starch forms a complex with iodine due to its helical structure, which traps iodine molecules.

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16 Easy

16 of 98

Understanding +4 | -1

Assertion: Chitin is homopolymer
Reason: Chitin is made up of only one type of monomer i.e.
N-acetylglucosamine.

View answer and explanation

Correct option: A

If both the assertion and the reason are true and the
reason is a correct explanation of the
assertion

Option A (If both the assertion and the reason are true and the reason is a correct explanation of the assertion) is correct because chitin is a homopolymer made up of only N-acetylglucosamine monomers.

17 Easy

17 of 98

Understanding +4 | -1

Assertion: In polysaccharide chain the right end is reducing
Reason: The right end contain free anomeric -OH group

View answer and explanation

Correct option: A

If both the assertion and the reason are true and the
reason is a correct explanation of the
assertion

Option A (If both the assertion and the reason are true and the reason is a correct explanation of the assertion) is correct because the reducing end of a polysaccharide chain has a free anomeric -OH group, allowing it to reduce other compounds.

18 Easy

18 of 98

Remembering +4 | -1

Which of the following secondary metabolites are used as drugs?

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Correct option: A

Vinblastin and curcumin

Option A (Vinblastin and curcumin) is correct because both are secondary metabolites used as drugs, vinblastin as an anti-cancer drug and curcumin as an anti-inflammatory agent.

19 Easy

19 of 98

Understanding +4 | -1

After grinding a living tissue in trichloroacetic acid and then straining it, you would obtain two fractions : acid soluble pool and acid insoluble fraction. Acid insoluble fraction does not contains

View answer and explanation

Correct option: D

Flavonoids and alkaloids

Option D (Flavonoids and alkaloids) is correct because these are secondary metabolites, not primary macromolecules found in the acid-insoluble fraction.

20 Easy

20 of 98

Remembering +4 | -1

The free energy of a system, in a spontaneous reaction

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Correct option: A

Decreases

Option A (Decreases) is correct because spontaneous reactions are exergonic, meaning they release free energy, causing a decrease in the system's free energy.

21 Easy

21 of 98

Understanding +4 | -1

Which of the following biomolecule is obtained by adding phosphate group to a nucleoside?

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Correct option: D

Nucleotide

Option D (Nucleotide) is correct because a nucleotide is formed when a phosphate group is added to a nucleoside.

22 Easy

22 of 98

Remembering +4 | -1

Alkaloids; Flavonoids; Rubber; Essential oils;
antibiotics; coloured pigments; scents; Gums ; Spices
How many of the above are primary metabolites

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Correct option: B

Option B (9) is correct because all the listed substances are secondary metabolites.

23 Easy

23 of 98

Remembering +4 | -1

All of the following are aromatic amino acids, except

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Correct option: D

Alanine

Option D (Alanine) is correct because it does not contain an aromatic ring in its structure, unlike the other options.

24 Easy

24 of 98

Remembering +4 | -1

Name the most abundant protein in animal world

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Correct option: C

Collagen

Option C (Collagen) is correct because collagen is the most abundant protein in the animal kingdom.

25 Easy

25 of 98

Understanding +4 | -1

Select the biomolecule in which phosphate group is esterified to the sugar.

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Correct option: D

\mathrm{ADP}

Option D (ADP) is correct because in ADP (Adenosine Diphosphate), the phosphate groups are esterified to the sugar ribose.

26 Easy

26 of 98

Remembering +4 | -1

The rate of the reaction doubles or decreases by half, for every… °C change in either direction

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Correct option: A

{10^0}

Option A (

{10^0}

) is correct because the rate of reaction typically doubles or halves for every 10°C change, which is described by the temperature coefficient.

27 Easy

27 of 98

Remembering +4 | -1

The pyrimidine base, which confers additional stability to DNA over RNA, is

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Correct option: D

Thymine

Option D (Thymine) is correct because thymine has a methyl group that provides additional stability to DNA compared to RNA's uracil.

28 Easy

28 of 98

Remembering +4 | -1

Select the secondary metabolites from the list given below
I. alkaloids
II. flavonoids
III. rubber
IV. essential oils
V. antibiotics
VI. coloured pigments
VII. scents
VIII. gums
IX. spices
Choose the correct option

View answer and explanation

Correct option: A

I to IX

Option A (I to IX) is correct because all listed items (alkaloids, flavonoids, rubber, essential oils, antibiotics, coloured pigments, scents, gums, and spices) are secondary metabolites.

29 Easy

29 of 98

Remembering +4 | -1

The most abundant molecule in cell, is

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Correct option: A

Water

Option A (Water) is correct because water is the most abundant molecule in a cell, essential for cellular processes.

30 Easy

30 of 98

Remembering +4 | -1

In a polypeptide chain, a β-pleated sheet is an example of

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Correct option: A

2° structure

Option A (2° structure) is correct because a β-pleated sheet is a type of secondary structure in a polypeptide chain.

Revision notes and key takeaways

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Key Takeaways

✓ This set contains 98 single-correct-answer MCQs on BIOMOLECULES.
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