Biology Quiz for NEET_9 (Biomolecules)

Biology Quiz for NEET_9 (Biomolecules)

1 / 30

Which of the following relationships between energies of substrates, products, and transition states in an uncatalyzed reaction (Es, Ep, and Et) and an enzyme-catalyzed reaction (E’s, E’p, and E’t) is incorrect?

2 / 30

Assertion (A): The enzymes are biological catalysts.
Reason (R): Enzymes speed up chemical reactions in living organisms.
In light of the above A and R, choose the correct answer from the options given below:

3 / 30

Which of the following is the N-terminal amino acid of a nascent polypeptide in eukaryotes?

4 / 30

Given below are two statements:
Assertion (A): RNA is less stable than DNA.
Reason (R): The presence of the 2'-hydroxyl group on the ribose sugar makes RNA more prone to hydrolysis reactions compared to DNA, which lacks the 2'-hydroxyl group.
In light of the above A and R, choose the correct answer from the options given below:

5 / 30

How many chemically distinct components does a nucleotide have?

6 / 30

Given below are two statements:
Statement I: Glucosamine and N-acetyl
galactosamine are polymers of amino sugars.
Statement II: Both Glucosamine and N-acetyl
galactosamine are glucose derivatives.
In light of the above statements, choose the correct answer from the options given below:

7 / 30

Given below are two statements:
Statement I: Starch and Cellulose both are homopolymers of glucose.
Statement II: Cellulose forms a branched, helical structure while starch is a linear, nonhelical structure.
In light of the above statements, choose the correct answer from the options given below:

8 / 30

Given below are two statements:
Statement I: The acid-soluble pool represents roughly the nucleoplasmic composition.
Statement II: The macromolecular components of the cells are present in the cytoplasm and organelles.
In light of the above statements, choose the correct answer from the options given below:

9 / 30

Which of the following is not a polymer?

10 / 30

Given below are two statements:
Assertion (A): The addition of chilled ethanol precipitates out DNA from the solution.
Reason (R): Ethanol has a lower polarity compared to water which causes a decrease in the solubility of DNA molecules in the solution.
In light of the above statements, choose the correct answer from the options given below:

11 / 30

Given below are two statements:
Statement I: Glycerol is a simple lipid.
Statement II: Glycerol is trihydroxy propene.
In light of the above statements, choose the correct answer from the options given below:

12 / 30

An enzyme-catalyzed reaction is performed at different substrate concentrations, [S], and the reaction velocity is measured in each case. The data obtained are tabulated below.

Substrate concentration, [S] (in µmol)10 20 30 40 50 60
Reaction velocity, V (in µmol/sec)2.5 5 7.5 10 15 15

What would be the KM value for the above reaction?

13 / 30

An uncatalyzed reaction with a plentiful number of substrates is allowed to take place. The product concentration is measured at an interval of every 15 minutes starting from the beginning and tabulated in the following table.

Time (in min) 0 15 30 45 60
Product concentration (in mM)0 5 10 15 15

The same reaction is again performed with an enzyme keeping other parameters constant. A 15 mM of products can be measured earliest:

14 / 30

The number of substrate molecules converted into products every second by the enzyme is called the turn-over number (TON) of the enzyme. The TON of carbonic anhydrase is about_______.

15 / 30

The following are the descriptions of B-DNA:
[I]. It is a double-stranded, helical structure
[II]. The polynucleotide strands run parallel to each other
[III]. The polynucleotide strand run antiparallel to each other
[IV]. The consecutive nucleotides are linked through a phosphodiester bond
[V]. The adjacent nucleotides are linked through hydrogen bonds
The correct descriptions are:

16 / 30

Turn, pitch, and rise of B-DNA are, respectively:

17 / 30

In the adjacent molecule, 1, 2, 3, and 4 are respectively:

18 / 30

Enzymes work by:

19 / 30

The rate of a reaction cannot be represented as:

20 / 30

The three kinds of cofactors of enzymes are:
[I]. Prosthetic group
[II]. Coenzyme and
[III]. Metal ions.
They can be:
[a]. Organic compound tightly bound to apoenzyme
[b]. Organic compound transiently bound to apoenzyme
[c]. Inorganic compound tightly bound to apoenzyme
[d]. Inorganic compound transiently bound to apoenzyme
[e]. Metal in their ionic form
Which of the following is the correct match of the cofactor and their property?

21 / 30

Raffinose is a trisaccharide formed by galactose, glucose, and fructose condensation. How many water molecule(s) is/are released during raffinose formation?

22 / 30

The Michaelis-Menten constant (Km) is:

23 / 30

Which of the following is not a difference between a biocatalyst and an inorganic catalyst?

24 / 30

Nucleic acid, which functions like an enzyme, is called:

25 / 30

The blood-glucose concentration of a normal healthy individual is:

26 / 30

Sulfur-containing amino acids are:

27 / 30

Which of the following is a fatty acid?

28 / 30

The aromatic amino acids are:

29 / 30

A thick slurry is made of human erythrocytes in CCl3COOH and filtered by filter paper. Which of the following will be absent from the retentate?

30 / 30

Before laboratory synthesis of urea, it was thought that organic molecules could be synthesized only by living organisms. Who synthesized urea for the first time?

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