Biomolecules

The protein portion of an enzyme is called :

Match List-I with List-II:

Choose the correct answer from the options given below :

[Re-NEET 2024]

Inhibition of succinic dehydrogenase enzyme by malonate is a classical example of:

[NEET 2024]

Which of the following is a nucleotide ?

[Re-NEET 2024]

Which of the following are not fatty acids?
A. Glutamic acid
B. Arachidonic acid
C. Palmitic acid
D. Lecithin
E. Aspartic acid

Choose the correct answer from the options given below:

[Re-NEET 2024]

Inhibition of succinic dehydrogenase enzyme by malonate is a classical example of:

[NEET 2024]

Name the class of enzyme that usually catalyze the following reaction:

\(S-G+{S}^{#}\to S+{S}^{#}-G\)

Where, G → a group other than hydrogen
S → a substrate
\({S}^{#}\) → another substrate

[NEET 2025]

Enzymes that catalyse the removal of groups from substrates by mechanisms other than hydrolysis leaving double bonds, are known as :

[Re-NEET 2024]

Which of the following are not fatty acids?
A. Glutamic acid
B. Arachidonic acid
C. Palmitic acid
D. Lecithin
E. Aspartic acid

Choose the correct answer from the options given below:

[Re-NEET 2024]

Regarding catalytic cycle of an enzyme action, select the correct sequential steps :
A. Substrate enzyme complex formation.
B. Free enzyme ready to bind with another substrate.
C. Release of products.
D. Chemical bonds of the substrate broken.
E. Substrate binding to active site.

Choose the correct answer from the options given below :

[NEET 2024]

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Which of the following are not fatty acids?
A. Glutamic acid
B. Arachidonic acid
C. Palmitic acid
D. Lecithin
E. Aspartic acid

Choose the correct answer from the options given below:

[Re-NEET 2024]

Inhibition of succinic dehydrogenase enzyme by malonate is a classical example of:

[NEET 2024]

Match List-I with List-II:

Choose the correct answer from the options given below:

[NEET 2024]

The cofactor of the enzyme carboxypeptidase is:

[NEET 2024]

Ligases is a class of enzymes responsible for catalysing the linking together of two compounds. Which of the following bonds is not catalysed by it?

[Re-NEET 2024]

Ligases is a class of enzymes responsible for catalysing the linking together of two compounds. Which of the following bonds is not catalysed by it?

[Re-NEET 2024]

Lecithin, a small molecular weight organic compound found in living tissues, is an example of:

[NEET 2024]

Which of the following is a nucleotide ?

[Re-NEET 2024]

Match List I with List II :

Choose the correct answer from the options given below:

[NEET 2026]

Enzymes that catalyse the removal of groups from substrates by mechanisms other than hydrolysis leaving double bonds, are known as :

[Re-NEET 2024]

Lecithin, a small molecular weight organic compound found in living tissues, is an example of:

[NEET 2024]

Alpha-helix is found in which level of protein structure?

[NEET 2026]

Regarding catalytic cycle of an enzyme action, select the correct sequential steps :
A. Substrate enzyme complex formation.
B. Free enzyme ready to bind with another substrate.
C. Release of products.
D. Chemical bonds of the substrate broken.
E. Substrate binding to active site.

Choose the correct answer from the options given below :

[NEET 2024]

Arrange the following elements in descending order of their contribution to percentage weight of the human body.

(a) Oxygen

(b) Carbon

(c) Hydrogen

(d) Nitrogen

Choose the correct answer from the options given below:

[Re-NEET 2026]

Ligases is a class of enzymes responsible for catalysing the linking together of two compounds. Which of the following bonds is not catalysed by it?

[Re-NEET 2024]

Which of the following is a nucleotide ?

[Re-NEET 2024]

Which of the following statements are correct regarding amino acids?
A. They are substituted methanes.
B. Serine is an aromatic amino acid.
C. Valine is a neutral amino acid.
D. Lysine is an acidic amino acid.

Choose the correct answer from the options given below:

[NEET 2026]

Match List-I with List-II.

Choose the correct answer from the options given below:

[Re-NEET 2026]

Which one of the following enzymes contains 'Haem' as the prosthetic group?

[NEET 2025]

The cofactor of the enzyme carboxypeptidase is:

[NEET 2024]

Identify the correct statements about biomolecules:
A Lipids are generally water soluble．
B. Proteins are polypeptides．
C. Polysaccharides are long chains of sugars．
D. Adenine and guanine are substituted pyrimidines．
E. Almost all enzymes are proteins．
Choose the correct answer from the options given below：

[NEET 2026]

Regarding catalytic cycle of an enzyme action, select the correct sequential steps :
A. Substrate enzyme complex formation.
B. Free enzyme ready to bind with another substrate.
C. Release of products.
D. Chemical bonds of the substrate broken.
E. Substrate binding to active site.

Choose the correct answer from the options given below :

[NEET 2024]

Identify the basic amino acid from the following.

[NEET 2020]

Identify the substances having glycosidic bond and peptide bond, respectively in their structure:

Match List-I with List-II

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Choose the correct answer from the options given below.

[NEET 2021]

Given below are two statements :
Statement I : Low temperature preserves the enzyme in a temporarily inactive state whereas high temperature destroys enzymatic activity because proteins are denatured by heat.
Statement II : When the inhibitor closely resembles the substrate in its molecular structure and inhibits the activity of the enzyme, it is known as competitive inhibitor.
In the light of the above statements, choose the correct answer from the options given below :

[NEET 2023]

Cellulose does not form blue colour with Iodine because

[NEET 2023]

Identify the substances having glycosidic bond and peptide bond, respectively in their structure.

[NEET 2020]

Following are the statements with reference to lipids

A. Lipids having only single bonds are called unsaturated fatty acids.

B. Lecithin is a phospholipid.

C. Trihydroxy propane is glycerol.

D. Palmitic acid has 20 carbon atoms including carboxyl carbon.

E. Arachidonic acid has 16 carbon atoms.

Choose the correct answer from the options given below

[NEET 2021]

Cellulose does not form blue colour with lodine because

Secondary metabolites such as nicotine, strychnine and caffeine are produced by plants for their

[NEET 2020]

Match the following.

Choose the correct option from the following:

[NEET 2020]

Which one of the following is the most abundant protein in the animals?

[NEET 2020]

Malonate inhibits the growth of pathogenic bacteria by inhibiting the activity of

Which of the following are not secondary metabolites in plants?

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 \(\beta\)-type.)
In the light of the above statements, choose the correct answer from the options given below :

[NEET 2023]

Match the following.

Choose the correct option from the following:

[NEET 2020]

A non-proteinaceous enzyme is

In the polynucleotide chain of DNA, a nitrogenous base is linked to the \( -\mathrm{OH} \) of

[Re-NEET 2020]

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 \(\beta\) type.)
In the light of the above statements, choose the correct answer from the options given below :

[NEET 2023]

Identify the statement which is incorrect.

[Re-NEET 2020]

Cellulose does not form blue colour with Iodine because:

Following are the statements with reference to 'lipids'.
A. Lipids having only single bonds are called unsaturated fatty acids.
B. Lecithin is a phospholipid.
C. Trihydroxy propane is glycerol.
D.Palmitic acid has 20 carbon atoms including carboxyl carbon.
E. Arachidonic acid has 16 carbon atoms.

Choose the correct answer from the options given below.

Match List-I with List-II:

Choose the correct answer from the options given below :

[Re-NEET 2024]

Given below are two statements:

Statement I: Low temperature preserves the enzyme in a temporarily inactive state whereas high temperature destroys enzymatic activity because proteins are denatured by heat.
Statement II: When the inhibitor closely resembles the substrate in its molecular structure and inhibits the activity of the enzyme, it is known as competitive inhibitor.
In the light of the above statements, choose the correct answer from the options given below:

Secondary metabolites such as nicotine, strychnine and caffeine are produced by plants for their

Identify the incorrect pair.

[NEET 2021]

Malonate inhibits the growth of pathogenic bacteria by inhibiting the activity of

[NEET 2023]

Most abundant organic compound on Earth is

Choose the correct pair from the following.