NEET BIOMOLECULES QUIZ 5 Tests × 10 Questions = 50 Questions

BIOMOLECULES – NEET MCQ PRACTICE

5 Tests × 10 Questions = 50 Questions

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Source: Uploaded 9 BIOMOLECULES 1QA.pdf. Questions are selected/adapted from the supplied Biomolecules question bank and its explanations.

TEST 1 – Biomolecules Basics

1. The essential chemical components of many coenzymes are:

A) Nucleic acids B) Carbohydrates C) Vitamins D) Proteins

Correct Answer: C) Vitamins

2. The sum total composition of the acid-soluble and acid-insoluble fractions represents the entire composition of the:

A) Cellular pool B) Gene library C) Dead cells D) Gene pool

Correct Answer: A) Cellular pool

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3. Which is least likely to be involved in stabilising the three-dimensional folding of most proteins?

A) Ester bonds B) Hydrogen bonds C) Electrostatic interactions D) Hydrophobic interactions

Correct Answer: A) Ester bonds

4. Which monosaccharide does not show optical isomerism?

A) Dihydroxyacetone B) Glyceraldehyde C) Erythrose D) Ribose

Correct Answer: A) Dihydroxyacetone

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5. Water is important for the body of animals in:

A) Reproduction B) Keeping the body only warm C) Working as solvent D) All of them

Correct Answer: D) All of them

6. Which element is normally absent in proteins?

A) C B) N C) S D) P

Correct Answer: D) P

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7. The chitinous exoskeleton of arthropods is formed by polymerisation of:

A) Lipoglycans B) Keratin sulphate C) D-glucosamine D) N-acetyl glucosamine

Correct Answer: D) N-acetyl glucosamine

8. Which of the following is a non-reducing carbohydrate?

A) Maltose B) Sucrose C) Lactose D) Ribose-5-phosphate

Correct Answer: B) Sucrose

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9. Lipids are insoluble in water because lipid molecules are:

A) Hydrophilic B) Hydrophobic C) Neutral D) Zwitter ions

Correct Answer: B) Hydrophobic

10. Which of the following is a triglyceride?

A) Wax B) Phospholipid C) Oil D) Steroid

Correct Answer: C) Oil

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TEST 2 – Carbohydrates & Lipids

1. Carbohydrates are stored in mammals mainly as:

A) Glucose in liver B) Glycogen in muscles and spleen C) Lactic acid in muscles D) Glycogen in liver and muscles

Correct Answer: D) Glycogen in liver and muscles

2. Cellulose is made of:

A) Unbranched glucose chains linked by α-1,4 bonds B) Branched glucose chains C) Unbranched glucose chains linked by β-1,4 bonds D) Glucose chains linked only by α-1,6 bonds

Correct Answer: C) Unbranched glucose chains linked by β-1,4 bonds

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3. Which characteristic is associated with DNA?

A) Uracil B) Deoxyribose sugar C) Single-stranded structure in all organisms D) Ability of protein synthesis

Correct Answer: B) Deoxyribose sugar

4. Which biomolecule has phosphodiester bonds?

A) Monosaccharides in a polysaccharide B) Amino acids in a polypeptide C) Nucleotides in a nucleic acid D) Fatty acids in a diglyceride

Correct Answer: C) Nucleotides in a nucleic acid

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5. In RNA, thymine is replaced by:

A) Adenine B) Guanine C) Cytosine D) Uracil

Correct Answer: D) Uracil

6. In which form is extra sugar stored in the body?

A) Glucose monosaccharide B) Sucrose disaccharide C) Glycogen polysaccharide D) Fatty acid and glycerol

Correct Answer: C) Glycogen polysaccharide

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7. Which sugar is found in ATP?

A) Deoxyribose B) Ribose C) Trehalose D) Glucose

Correct Answer: B) Ribose

8. Sugar found in the haemolymph of insects is called:

A) Maltose B) Lactose C) Trehalose D) Galactose

Correct Answer: C) Trehalose

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9. Which is not a polysaccharide?

A) Sucrose B) Starch C) Glycogen D) Cellulose

Correct Answer: A) Sucrose

10. Amylose and amylopectin chains occur in:

A) Glycogen B) Starch C) Cellulose D) Chitin

Correct Answer: B) Starch

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TEST 3 – Proteins

1. The two polypeptides of human insulin are linked together by:

A) Hydrogen bonds B) Phosphodiester bonds C) Covalent bonds D) Disulphide bridges

Correct Answer: D) Disulphide bridges

2. For body growth and repair one needs:

A) Carbohydrates B) Fats C) Proteins D) Vitamins

Correct Answer: C) Proteins

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3. The most simple amino acid is:

A) Tyrosine B) Lysine C) Glycine D) Aspartic acid

Correct Answer: C) Glycine

4. A protein is a heteropolymer because it is usually made of:

A) 20 types of monomer B) 40 types of monomer C) 30 types of monomer D) Only one type of monomer

Correct Answer: A) 20 types of monomer

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5. Specificity of a protein is mainly due to its:

A) Types of amino acids B) Sequence of amino acids C) Number of amino acids D) Quantity of amino acids

Correct Answer: B) Sequence of amino acids

6. Which of the following is an essential amino acid?

A) Alanine B) Glycine C) Tryptophan D) Tyrosine

Correct Answer: C) Tryptophan

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7. Which group contains only essential amino acids?

A) Leucine B) Valine C) Tryptophan D) All of these

Correct Answer: D) All of these

8. The protein configuration that provides information only about the sequence of amino acids is:

A) Primary B) Secondary C) Tertiary D) Quaternary

Correct Answer: A) Primary

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9. The helical structure of protein is stabilised mainly by:

A) Dipeptide bonds B) Hydrogen bonds C) Ether bonds D) Peptide bonds

Correct Answer: B) Hydrogen bonds

10. Collagen is a:

A) Fibrous protein B) Globular protein C) Lipid D) Carbohydrate

Correct Answer: A) Fibrous protein

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TEST 4 – Enzymes

1. Holoenzyme is the complete enzyme consisting of:

A) Protein and protein B) Apoenzyme and co-factor C) Co-factor only D) Apoenzyme only

Correct Answer: B) Apoenzyme and co-factor

2. The protein part of a conjugated enzyme is called:

A) Holoenzyme B) Apoenzyme C) Coenzyme D) Isoenzyme

Correct Answer: B) Apoenzyme

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3. The non-protein part of a conjugated enzyme is called:

A) Apoenzyme B) Co-factor C) Substrate D) Peptide

Correct Answer: B) Co-factor

4. The enzyme lowers the:

A) Product concentration B) Activation energy C) Substrate concentration D) Temperature

Correct Answer: B) Activation energy

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5. A competitive inhibitor of succinate dehydrogenase is:

A) Malonate B) Oxaloacetate C) α-ketoglutarate D) Malate

Correct Answer: A) Malonate

6. Zinc is a co-factor for the proteolytic enzyme:

A) Carboxypeptidase B) Isocitrate dehydrogenase C) Fumarase D) None of these

Correct Answer: A) Carboxypeptidase

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7. Enzymes that catalyse hydrolysis of ester, ether, peptide and glycosidic bonds are:

A) Hydrolases B) Lyases C) Ligases D) Isomerases

Correct Answer: A) Hydrolases

8. Dihydroxyacetone-3-phosphate and glyceraldehyde-3-phosphate interconversion is catalysed by an enzyme belonging to:

A) Isomerases B) Ligases C) Lyases D) Hydrolases

Correct Answer: A) Isomerases

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9. Enzymes having slightly different molecular structures but performing identical activity are called:

A) Homoenzymes B) Isoenzymes C) Apoenzymes D) Coenzymes

Correct Answer: B) Isoenzymes

10. An organic substance bound to an enzyme and essential for its activity is called:

A) Holoenzyme B) Apoenzyme C) Isoenzyme D) Coenzyme

Correct Answer: D) Coenzyme

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TEST 5 – DNA, RNA & Mixed Revision

1. Two free ribonucleotide units are interlinked with a:

A) Peptide bond B) Covalent bond C) Hydrogen bond D) Phosphodiester bond

Correct Answer: D) Phosphodiester bond

2. A DNA segment has 120 adenine and 120 cytosine bases. The total number of nucleotides is:

A) 120 B) 240 C) 60 D) 480

Correct Answer: D) 480

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3. Which nitrogenous bases are pyrimidines?

A) T and C B) T and A C) A and C D) G and T

Correct Answer: A) T and C

4. The basic unit of nucleic acid is:

A) Pentose sugar B) Nucleoid C) Nucleoside D) Nucleotide

Correct Answer: D) Nucleotide

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5. A nitrogenous base together with pentose sugar and phosphate forms a:

A) Nucleoside B) Polypeptide C) Nucleotide D) Amino acid

Correct Answer: C) Nucleotide

6. The four elements called the 'big four' of the cell are:

A) CHOS B) CHOP C) CHON D) CNOP

Correct Answer: C) CHON

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7. The most abundant organic compound on Earth is:

A) Protein B) Cellulose C) Lipids D) Steroids

Correct Answer: B) Cellulose

8. The number of hydrogen bonds between guanine and cytosine is:

A) One B) Two C) Three D) Four

Correct Answer: C) Three

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9. In a double helix of DNA, the two DNA strands are:

A) Coiled around a common axis B) Coiled around each other C) Coiled differently D) Coiled over a protein sheath

Correct Answer: A) Coiled around a common axis

10. The most abundant chemical in living organisms is:

A) Protein B) Water C) Sugar D) Nucleic acid

Correct Answer: B) Water

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