laboursonline – MCQs, Mock Tests | Biology Biology MCQ Question

Which bond provides stability to complex carbohydrate molecules?

1. C-H
2. C-O
3. C-C
4. C-N

✅ Correct Answer: 3

% of water in brain cells is

1. 20%
2. 80%
3. 85%
4. 90%

✅ Correct Answer: 3

Which statement is true about an aqueous medium:

1. Ionic as well as non ionic substance in aqueous media retains their identity.
2. Enzymes can not perform catalysis reaction in this medium.
3. Ions and molecules move randomly thus are in more favorable state to react with other molecules and ions.
4. It is less favorable media for chemical reactions.

✅ Correct Answer: 3

Which of the following substance is most favorable to form structural component of biological membranes?

1. Hydrophilic Carbohydrates
2. Hydrophobic fats.
3. Both a and b
4. None of these

✅ Correct Answer: 2

The number of calories required to raise the temperature of 1g of water from 15 to 16?C is called?

1. Specific Heat of Vaporization
2. Specific Heat capacity
3. Caloric Heat
4. Both A and C

✅ Correct Answer: 2

The property of water due to which it works as a temperature stabilizer and hence protect living organisms from sudden thermal changes is:

1. High specific heat of vaporization
2. High specific heat capacity
3. Its Dipole nature
4. Its liquid state

✅ Correct Answer: 2

Specific heat of vaporization of water is:

1. 574 Kcal/kg
2. 674 Kcal/kg
3. 774 Kcal/kg
4. 874 Kcal/kg

✅ Correct Answer: 1

A complex substance which on hydrolysis yields polyhydroxy aldehyde or ketone subunits is called:

1. Lipid
2. Carbohydrate
3. Protein
4. Carotein

✅ Correct Answer: 2

Cn(H2O)n. is a general formula of :

1. Monosaccharides
2. Oligosaccharides
3. Ploysacharides
4. Carbohydrates

✅ Correct Answer: 1

Which of the statement is not true for compounds like glycoprotein and glycolipids?

1. They are conjugated molecules of carbohydrates
2. Both have role in the extra cellular matrix of animals and bacterial cell wall
3. They are components of biological membranes.
4. Both are produced and secreted by endoplasmic reticulum

✅ Correct Answer: 4

Which one are most complex sugar:

1. Monosaccharides
2. Oligosaccharides
3. Polysaccharides
4. None of these

✅ Correct Answer: 3

Which of the following carbohydrate is tasteless?

1. Monosaccharide
2. Oligosaccharide
3. Polysaccharide
4. None of these

✅ Correct Answer: 3

Which of the following carbohydrate can not be hydrolysed?

1. Monosaccharide
2. Oligosaccharide
3. Polysaccharide
4. None of these

✅ Correct Answer: 1

Ribose is an example of

1. Trioses
2. Tetroses
3. Pentose
4. Hexose

✅ Correct Answer: 3

% of Glucose normally present in our blood is

1. 0.80%
2. 0.08%
3. 1.80%
4. 8%

✅ Correct Answer: 2

Starch cellulose and glaycogen yield ________ on complete hydrolysis.

1. Maltose
2. Sucrose
3. Fructose
4. Glucose

✅ Correct Answer: 4

For the synthesis of 10g of glucose ______ of energy is required:

1. 717.6 Kcal
2. 727 Kcal
3. 737 Kcal
4. 747 Kcal

✅ Correct Answer: 1

Which one is abundant in animals?

1. Starch
2. Glycogen
3. Cellulose
4. None of these

✅ Correct Answer: 2

Which one is soluble in hot water?

1. Starch
2. Glycogen
3. Amylose
4. Amylopectin.

✅ Correct Answer: 3

The covalent bond between two monosaccharide subunits is called:

1. Phosphodiester bond
2. Peptide bond
3. Glycosidic Bond
4. Ionic bond

✅ Correct Answer: 3

Which one gives blue colour with iodine?

1. Starch
2. Glycogen
3. Cellulose
4. Polysaccharide

✅ Correct Answer: 1

Which of the following polysaccharide is called animal starch?

1. Starch
2. Glycogen
3. Cellulose
4. None of these

✅ Correct Answer: 2

_________ is example of pure form of cellulose

1. Silk
2. Wool
3. Cotton
4. Paper

✅ Correct Answer: 3

Lipids are soluble in which of the following :

1. Water
2. Ether
3. All solvents
4. Not in any of the above

✅ Correct Answer: 2

Lipid molecules can store double amount of energy as compared to same amount of carbohydrate because of high number of

1. C-C bonds
2. C-H bonds
3. C-N bonds
4. C-O bonds

✅ Correct Answer: 2

A compound produced as a result of a chemical reaction of an alcohol with an acid in which water molecule is released is called:

1. Monosaccharide
2. Fatty acid
3. Neutral lipid
4. Nucleic acid

✅ Correct Answer: 3

Fatty acids containing 18 C atoms and a single double bond is

1. Saturated Fatty acid
2. Unsaturated fatty acid
3. Oleic Acid
4. Plamitic acid

✅ Correct Answer: 3

Which one the following fatty acid is more soluble in an organic solvent and has higher melting point?

1. Acetic acid
2. Butyric acid
3. Palmitic acid
4. All have same

✅ Correct Answer: 3

Which of the following statement is incorrect5 for fats containing unsaturated fatty acid?

1. They contain double bond
2. They are usually solid at room temperature
3. They are lighter than water
4. Their specific gravity is less than 1

✅ Correct Answer: 2

Animals obtain carbohydrates mainly from

1. Glucose
2. Starch
3. Sucrose
4. Glycogen

✅ Correct Answer: 2

Peptide bond is:

1. C-N link
2. C- O lind
3. N-H link
4. C-H link

✅ Correct Answer: 1

Chemical component/s less in eukaryotic cell as compared to prokaryotic cell is / are (i) lipids (ii) carbodydrates (iii) proteins (iv) DNA

1. i & ii
2. iii & iv
3. i ii iii & iv
4. iv only

✅ Correct Answer: 4

Proteins comprise of _____% of the total dry weight of a cell.

1. 40%
2. 50%
3. 60%
4. 70%

✅ Correct Answer: 2

Proteins are polymers of

1. Fatty acids
2. Isoprenoid units
3. Amino acids
4. Nucleotides

✅ Correct Answer: 3

The element in basic structure of proteins which differentiate them from carbohydrates is

1. C
2. S
3. H
4. N

✅ Correct Answer: 2

Total number of amino acids discovered so far in cells and tissues are

1. 20
2. 25
3. 150
4. 170

✅ Correct Answer: 4

In Glycin an amino acid R group is replaced by

1. H
2. CH3
3. COOH
4. C = O

✅ Correct Answer: 1

A bond formed by linkage between -OH of carboxyl group of one amino acid and H of amino group of another amino acid which releases water is called

1. Phosphodiester linkage
2. Glycosidic bond
3. Peptide bond
4. Hydrogen bond

✅ Correct Answer: 3

Total number of amino acids in a hemoglobin molecule are:

1. 554
2. 564
3. 574
4. 584

✅ Correct Answer: 3

An insulin molecule consists of _____ polypeptide chains.

1. 1
2. 2
3. 3
4. 4

✅ Correct Answer: 2

Which structure of protein gives information aboutnumber and sequence of amino acids in it?

1. Primary structure
2. Secondary structure
3. Tertiary structure
4. Quaternary structure

✅ Correct Answer: 1

In an aqueous environment the most stable tertiary conformation is that in which ______ amino acids are buried inside the conformation.

1. Hydrophobic
2. Hydrophilic
3. Basic
4. None of these

✅ Correct Answer: 1

Hemoglobin molecule exhibits which structural organization of proteins

1. Primary structure
2. Secondary structure
3. Tertiary structure
4. Quaternary structure

✅ Correct Answer: 4

?- helical structure is kept by the formation of _____ bonds among amino acids molecules.

1. H bonds
2. Disulphide Bond
3. Ionic bond
4. Hydrophobic bonds

✅ Correct Answer: 1

Which of the following does not show quaternary structure?

1. Haemoglobin
2. Pepsin
3. Fibrin
4. Insulin

✅ Correct Answer: 3

Which structural organization is most common in globular proteins?

1. Primary
2. Secondary
3. Tertiary
4. Quaternary

✅ Correct Answer: 3

Actin and myosin are the basic proteins involved in contractile machinery of our body to which type of proteins do they belong?

1. Globular proteins
2. Fibrous Proteins
3. Both a and b
4. None of these

✅ Correct Answer: 2

Antibodies play important role against microorganisms and other pathogens to which type of proteins do they belong?

1. Globular proteins
2. Fibrous Proteins
3. Both a and b
4. None of these

✅ Correct Answer: 1

ATP is a an important molecule for its major function

1. As an energy currency of the cell
2. As a coenzyme
3. Both a and b
4. None of these

✅ Correct Answer: 1

Each turn of DNA contain _______ nitrogenous base pairs

1. 5
2. 10
3. 20
4. 25

✅ Correct Answer: 2

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Biology MCQ Question - Biological Molecules