Biomolecules · Biology · NEET

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

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 :

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:

$$ \text { Match List I with List II : } $$

The following reaction depicts the activity of a particular class of enzymes :

Identify the enzymes class ' $E$ ' from the following options :

The protein portion of an enzyme is called:

Match List-I with List-II

Choose the option with all correct matches.

Which one of the following statements refers to Reductionist Biology?

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

Histones are enriched with -

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

$$S-G+S^{\#} \rightarrow S+S^{\#}-G$$

Where, G $\rightarrow$ a group other than hydrogen

$$S \rightarrow \text { a substrate }$$

$$S^{\#} \rightarrow \text { another substrate }$$

Which of the following is a nucleotide?

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?

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 :

Which of the following graphs depicts the effect of substrate concentration on velocity of enzyme catalysed reaction?

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

Match List-I with List-II.

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

The cofactor of the enzyme carboxypeptidase is:

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

Match List I with List II

Choose the correct answer from the options given below.

Match List I with List II:

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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 :

Match List - I with List - II

Choose the correct answer from the options given below :

Inulin is a polymer of :

Which of the following is not a secondary metabolite?

Match List-I with List-II.

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Cellulose does not form blue colour with Iodine because

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:

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:

When a carrier protein facilitates the movement of two molecules across the membrane in same direction, it is called

Match List-I with List-II

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Primary proteins are also called as polypeptides because :

Which of the following pair represents free living nitrogen fixing aerobic bacteria?

Choose the incorrect enzymatic rection:

If DNA contained sulfur instead of phosphorus and proteins contained phosphorus instead of sulfur, what would have been the outcome of Hershey and Chase experiment?

Given below are two statements:

Statement I : Amino acids have a property of ionizable nature of $$-$$NH₂ and $$-$$COOH groups, hence have different structures at different pH.

Statement-II : Amino acids can exist as Zwitterionic form at acidic and basic pH.

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

In the enzyme which catalyses the breakdown of:

H₂O₂ $$\to$$ H₂O + O₂

the prosthetic group is :

Read the following statements on lipids and find out correct set of statements :

(a) Lecithin found in the plasma membrane is a glycolipid

(b) Saturated fatty acids possess one or more c = c bonds

(c) Gingely oil has lower melting point, hence remains as oil in winter

(d) Lipids are generally insoluble in water but soluble in some organic solvents

(e) When fatty acid is esterified with glycerol, monoglycerides are formed

Choose the correct answer from the option given below:

A dehydration reaction links two glucose molecules to product maltose. If the formula for glucose is C₆H₁₂O₆ then what is the formula for maltose?

Match List-I with List-II:

Choose the correct answer from the options given below: