Biomolecules Biology Quiz for NEET

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Details of Biomolecules Biology Quiz for NEET
No. of Questions in Quiz36 with Explanation
Time for each Questions60 Seconds
Attempts AllowedUnlimited
AvailableAlways
Pass Percentage70 %

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#1. The two functional groups characteristic of sugars are

Sugar is a common term used to denote carbohydrate.

Carbohydrates are polyhydroxy aldehyde, ketone or their derivatives, which means they have carbonyl and hydroxyl groups.

#2. Which one of the following statements is correct, with reference to enzymes?

Holoenzyme is conjugated enzyme in which protein part is apoenzyme while non-protein is cofactor.

Coenzyme are also organic compounds but their association with apoenzyme is only transient and serve as cofactors.

#3. A non-proteinaceous enzyme is

Ribozyme is RNA acting like an enzyme or biocatalyst.

#4. The chitinous exoskeleton of arthropods is formed by the polymerisation of

Exoskeleton of arthropods is made up of chitin. Chitin is a homopolymer of N-acetyl glucosamine.

#5. Which one of the following is not applicable to RNA?

Chargaff’s rule is applicable only for dsDNA.

#6. Macromolecule chitin is

Chitin is a polymer of N-acetyl glucosamine.

#7. Telomerase is an enzyme which is a :

#8. Which of the following are not polymeric?

Nucleic acids are polymers of nucleotides – Proteins are polymers of amino acids – Polysaccharides are polymers of monosaccharides – Lipids are the esters of fatty acids and alcohol

#9. Which of the following is the least likely to be involved in stabilizing the three-dimensional folding of most proteins?

Ester bond is formed between sugar and phosphate in a nucleotide.

#10. A typical fat molecule is made up of

A typical fat molecule is triglyceride formed by esterification of one glycerol and three fatty acid molecules.

#11. Which one of the following statements is wrong?

Glycine is simplest amino acid in which ‘R’ is replaced by H(Hydrogen).

#12. Which of the following biomolecules does have a phosphodiester bond?

Phosphodiester bond is formed between two nucleotides of nucleic acid.

#13. Which one of the following statements is incorrect?

The presence of competitive inhibitor increases Km value of enzymes

#14. Select the option which is not correct with respect to enzyme action:

Inhibition of succinic dehydrogenase by malonate is an example of competitive inhibition. This is reversible reaction. On increasing the substrate (succinate) concentration the effect of inhibitor is removed and Vmax remains the same.

#15. Which one of the following is a non - reducing carbohydrate?

Lactose, Maltose, Ribose 5-phosphate all are reducing sugars.

#16. A phosphoglyceride is always made up of:

#17. The essential chemical components of many coenzymes are:

Niacin and riboflavin are used as coenzymes in NAD and FAD respectively.

#18. Transition state structure of the substrate formed during an enzymatic reaction is :

Transition state is a temporary structure formed during an enzymatic reaction.

#19. For its activity, carboxypeptidase requires

Carboxypeptidase requires Zn2 metal ion.

#20. Which one of the following biomolecules is correctly characterised?

Option (1) is wrong, because alanine contains an amino group and an acidic group at α-carbon in the molecule.

Option (3) is wrong, because palmitic acid is a saturated fatty acid with 16C atoms.

Option (4) is wrong, because adenylic acid is form by adding phosphate group to adenosine.

#21. Three of the following statements about enzymes are correct and one is wrong. Which one is wrong?

Most enzymes are protein but some are RNA i.e. Ribonuclease-P and ribozyme.

#22. Which one of the following pairs is wrongly matched?

Nitrogenase is useful in fixation of nitrogen.

#23. An organic substance bound to an enzyme and essential for its activity is called

Organic compound which bound to an enzyme is either coenzyme or prosthetic group.

#24. Which of the following is the simplest amino acid?

In glycine, the R-group is replaced by hydrogen.

#25. Enzymes, vitamins and hormones can be classified into a single category of biological chemicals, because all of these

(1) is incorrect, because enzymes can both enhance and inhibit the oxidative metabolism.

(3) is incorrect, different enzymes, vitamins and hormones are synthesized in the body at different situations.

(2) is incorrect, because all hormones and enzymes are not conjugated protein.

#26. Carbohydrates, the most abundant biomolecules on earth, are produced by

Autotrophic organism produce glucose by photosynthesis which is a carbohydrate. Heterotrophies are dependent on autotrophs and don’t produce carbohydrates and fungi are saprobic organisms.

#27. Which of the following statements regarding enzyme inhibition is correct ?

because a competitive inhibitor has a similar structure as that of a substrate, so it blocks the active site of an enzyme thereby reducing the production formation.

#28. The catalytic efficiency of two different enzymes can be compared by the

Enzymes with low Km are considered as good enzymes due to their high affinity for substrates.

#29. The four elements that make up 96% of all the elements found in a living system are

% weight of human body : C = 18.5; O = 65.0; N = 3.3; H = 0.5

#30. High cholesterol patients are advised to use

These oils contain polyunsaturated fatty acids (i.e. more than one double bond) and they are usually recommended by doctors to person having hypertension, high blood cholesterol and other cardiovascular diseases.

#31. Essential amino acid is

Essential amino acids are leucine, isoleucine, valine, tryptophane, phenylalanine, lysine and methionine.

#32. Lipids are insoluble in water because lipid molecules are

Hydro-means water, phobic – means repeling or hating

Lipids are hydrophobic that’s why they are not soluble in water.

#33. The major role of minor elements inside living organisms is to act as

Minor elements basically includes Zn, Mg, K, Ni, Co, NAD ,NADP they all come under the category of cofactor.

#34. Nucleotides are building blocks of nucleic acids. Each nucleotide is a composite molecule formed by

Nucleotide : Base Sugar Phosphate

Nucleic acid : (Base Sugar Phosphate)n

#35. About 98 percent of the mass of every living organism is composed of just six elements including carbon, hydrogen, nitrogen, oxygen and

#36. Which of the following is a neutral amino acid?

Glutamine, Asparagine → Amide group containing amino-acid.

Arginine → Basic amino acid

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