Biology MCQ (Multiple Choice Questions) - SchoolingAxis

Biology MCQ (Multiple Choice Questions)

 Que- Interphase of meiosis lacks 

a. G0 phase 

b. G1 phase 

c. G2 phase 

d. S phase 


Answer- G2 phase


Que- Homologous chromosomes are 

a. Similar and identical 

b. Identical but not similar 

c. Not similar and not identical 

d. Similar but not identical 


Answer- Similar but not identical


Que- The longest phase of meiosis I is 

a. Metaphase 

b. Anaphase 

c. Prophase 

d. Telophase 


Answer- Prophase


Que- Tetrad or bivalent is 

a. Paired homologous chromosome but not fused complex structure 

b. 2 unpaired homologous chromosome 

c. Paired and fused complex structure 

d. None of these 


Answer- Paired homologous chromosome but not fused complex structure


Que- Pairing of homologous chromosomes is completed in 

a. Leptotene 

b. Zygotene 

c. Pachytene 

d. Diplotene 


Answer- Pachytene


Que- Each bivalent has 

a. 3 chromatids 

b. 4 chromatids 

c. 5 chromatids 

d. 2 chromatids 


Answer- 4 chromatids


Que- Crossing over occurs between 

a. Sister chromatids 

b. Non sister chromatids 

c. Independent chromatids 

d. Each and every chromatid 


Answer- Non sister chromatids


Que- Inability of chromosomes to segregate during anaphase and telophase of meiosis is called 

a. Crossing over 

b. Chromosomal disjunction 

c. Chromosomal nondisjunction 

d. None of these 


Answer- Chromosomal nondisjunction


Que- Which statement is incorrect? 

a. Down's syndrome involves autosome 

b. In Turner's syndrome 2n-1 

c. In Klinefelter's syndrome XYY 

d. In Down's syndrome sperms are commonly involved 


Answer- In Down's syndrome sperms are commonly involved


Que- Apoptosis 

a. Cell death due to tissue damage 

b. Causes inflammation 

c. Internal programme of events by which cell commits suicide 

d. Damages neighboring cells 


Answer- Internal programme of events by which cell commits suicide


Que- A cell of human being has 46 chromosomes; it divides to form some daughter cells, each having 23 pairs of chromosomes. The division would be 

a. Mitosis 

b. Meiosis 

c. Amitosis 

d. Budding 


Answer- Mitosis


Que- Mitosis takes place during 

a. Healing of wound 

b. Development and growth 

c. Vegetative propagation 

d. All of these 


Answer- All of these


Que- Which of the following category comes under Turner's syndrome? 

a. A male having 2 X chromosomes 

b. A female having 3 X chromosomes 

c. A male having only 1 Y chromosome 

d. A female having only 1 X chromosome 


Answer- A female having only 1 X chromosome


Que- Morphology of chromosomes is best studied during 

a. Telophase 

b. Metaphase 

c. Prophase 

d. All of these 


Answer- Metaphase


Que- Cytokinins refers to 

a. Division of nucleus 

b. Division of cytoplasm 

c. Division of cell 

d. All of these 


Answer- Division of cell


Que- Which fibers intedigitate with each other? 

a. Astral fibers 

b. Kinetochore fibers 

c. Polar fibers 

d. All of these 


Answer- Polar fibers


Que- Cancer cells are 

a. Differentiated 

b. Undifferentiated 

c. Highly differentiated 

d. Less differentiated 


Answer- Less differentiated


Que- Crossing over in meiosis occurs during 

a. Zygotene 

b. Pachytene 

c. Dislotene 

d. Diakinesis 


Answer- Pachytene


Que- Which division does not show replication of chromosomes? 

a. Mitosis 

b. Meiosis I 

c. Meiosis II 

d. None of these 


Answer- Meiosis II


Que- A significant happening of meiosis is / are 

a. Crossing over 

b. Random assortment 

c. Both of these 

d. None of these 


Answer- Both of these


Que- Jacob's syndrome can be represented as 

a. XO 

b. XXX 

c. XXY 

d. XYY 


Answer- XYY


Que- The branch of biology which deals with the study of chemical compounds and the chemical processes in the fliving organisms is called: 

a. Chemistry 

b. Biochemistry 

c. Molocular biology 

d. Both a and b 


Answer- Biochemistry


Que- Which one is an organic compound? 

a. CO2 

b. Water 

c. Lipids 

d. HCI 


Answer- Lipids


Que- Which chemical component has the same % in bacterial as well as the mammalian cell? 

a. Water 

b. Carbohydrate 

c. Proteins 

d. Lipids 


Answer- Water


Que- Which chemical component has the greatest contribution in the total mammalian cell weight? 

a. Proteins 

b. Carbohydrate 

c. Lipids 

d. Water 


Answer- Water


Que- Reactions in which simple substances are combined to form complex substances are called: 

a. Metabolic reactions 

b. Catabolic reactions 

c. Anabolic reactions 

d. None of these 


Answer- Anabolic reactions


Que- Which one is the basic element of organic compounds ? 

a. Oxygen 

b. Hydrogen 

c. Sulphur 

d. Carbon 


Answer- Carbon


Que- The bond formed when two or more atoms complete their electron shells by sharing electrons is called: 

a. Ionic bond 

b. Hydrogen bond 

c. Covalent bond 

d. Electrovalent bond 


Answer- Covalent bond


Que- Carbon atom is 

a. Monovalent 

b. Divalent 

c. Trivalent 

d. Tetravalent 


Answer- Tetravalent


Que- Which bond provides stability to complex carbohydrate molecules? 

a. C-H 

b. C-O 

c. C-C 

d. C-N 


Answer- C-C


Que- % of water in brain cells is 

a. 0.2 

b. 0.8 

c. 0.85 

d. 0.9 


Answer- 0.85


Que- Which statement is true about an aqueous medium: 

a. Ionic as well as non ionic substance in aqueous media retains their identity. 

b. Enzymes can not perform catalysis reaction in this medium. 

c. Ions and molecules move randomly thus are in more favorable state to react with other molecules and ions. 

d. It is less favorable media for chemical reactions. 


Answer- Ions and molecules move randomly thus are in more favorable state to react with other molecules and ions.


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

a. Hydrophilic Carbohydrates 

b. Hydrophobic fats. 

c. Both a and b 

d. None of these 


Answer- Hydrophobic fats.


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

a. Specific Heat of Vaporization 

b. Specific Heat capacity 

c. Caloric Heat 

d. Both A and C 


Answer- Specific Heat capacity


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

a. High specific heat of vaporization 

b. High specific heat capacity 

c. Its Dipole nature 

d. Its liquid state 


Answer- High specific heat capacity


Que- Specific heat of vaporization of water is: 

a. 574 Kcal/kg 

b. 674 Kcal/kg 

c. 774 Kcal/kg 

d. 874 Kcal/kg 


Answer- 574 Kcal/kg


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

a. Lipid 

b. Carbohydrate 

c. Protein 

d. Carotein 


Answer- Carbohydrate


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

a. Monosaccharides 

b. Oligosaccharides 

c. Ploysacharides 

d. Carbohydrates 


Answer- Monosaccharides


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

a. They are conjugated molecules of carbohydrates 

b. Both have role in the extra cellular matrix of animals and bacterial cell wall 

c. They are components of biological membranes. 

d. Both are produced and secreted by endoplasmic reticulum 


Answer- Both are produced and secreted by endoplasmic reticulum


Que- Which one are most complex sugar: 

a. Monosaccharides 

b. Oligosaccharides 

c. Polysaccharides 

d. None of these 


Answer- Polysaccharides


Que- Which of the following carbohydrate is tasteless? 

a. Monosaccharide 

b. Oligosaccharide 

c. Polysaccharide 

d. None of these 


Answer- Polysaccharide


Que- Which of the following carbohydrate can not be hydrolysed? 

a. Monosaccharide 

b. Oligosaccharide 

c. Polysaccharide 

d. None of these 


Answer- Monosaccharide


Que- Ribose is an example of 

a. Trioses 

b. Tetroses 

c. Pentose 

d. Hexose 


Answer- Pentose


Que- Starch cellulose and glaycogen yield ________ on complete hydrolysis. 

a. Maltose 

b. Sucrose 

c. Fructose 

d. Glucose 


Answer- Glucose


Que- Which one is abundant in animals? 

a. Starch 

b. Glycogen 

c. Cellulose 

d. None of these 


Answer- Glycogen


Que- Which one is soluble in hot water? 

a. Starch 

b. Glycogen 

c. Amylose 

d. Amylopectin. 


Answer- Amylose


Que- The covalent bond between two monosaccharide subunits is called: 

a. Phosphodiester bond 

b. Peptide bond 

c. Glycosidic Bond 

d. Ionic bond 


Answer- Glycosidic Bond


Que- Which one gives blue colour with iodine? 

a. Starch 

b. Glycogen 

c. Cellulose 

d. Polysaccharide 


Answer- Starch


Que- Which of the following polysaccharide is called animal starch? 

a. Starch 

b. Glycogen 

c. Cellulose 

d. None of these 


Answer- Glycogen


Que- _________ is example of pure form of cellulose 

a. Silk 

b. Wool 

c. Cotton 

d. Paper 


Answer- Cotton


Que- Lipids are soluble in which of the following : 

a. Water 

b. Ether 

c. All solvents 

d. Not in any of the above 


Answer- Ether


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

a. C-C bonds 

b. C-H bonds 

c. C-N bonds 

d. C-O bonds 


Answer- C-H bonds


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

a. Monosaccharide 

b. Fatty acid 

c. Neutral lipid 

d. Nucleic acid 


Answer- Neutral lipid


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

a. Saturated Fatty acid 

b. Unsaturated fatty acid 

c. Oleic Acid 

d. Plamitic acid 


Answer- Oleic Acid


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

a. Acetic acid 

b. Butyric acid 

c. Palmitic acid 

d. All have same 


Answer- Palmitic acid


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

a. They contain double bond 

b. They are usually solid at room temperature 

c. They are lighter than water 

d. Their specific gravity is less than 1 


Answer- They are usually solid at room temperature


Que- Animals obtain carbohydrates mainly from 

a. Glucose 

b. Starch 

c. Sucrose 

d. Glycogen 


Answer- Starch


Que- Peptide bond is: 

a. C-N link 

b. C- O lind 

c. N-H link 

d. C-H link 


Answer- C-N link


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

a. i & ii 

b. iii & iv 

c. i ii iii & iv 

d. iv only 


Answer- iv only


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

a. 0.4 

b. 0.5 

c. 0.6 

d. 0.7 


Answer- 0.5


Que- Proteins are polymers of 

a. Fatty acids 

b. Isoprenoid units 

c. Amino acids 

d. Nucleotides 


Answer- Amino acids


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

a. C 

b. S 

c. H 

d. N 


Answer- S


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

a. 20.0 

b. 25.0 

c. 150.0 

d. 170.0 


Answer- 170.0


Que- In Glycin an amino acid R group is replaced by 

a. H 

b. CH3 

c. COOH 

d. C = O 


Answer- H


Que- 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 

a. Phosphodiester linkage 

b. Glycosidic bond 

c. Peptide bond 

d. Hydrogen bond 


Answer- Peptide bond


Que- Total number of amino acids in a hemoglobin molecule are: 

a. 554.0 

b. 564.0 

c. 574.0 

d. 584.0 


Answer- 574.0


Que- An insulin molecule consists of _____ polypeptide chains. 

a. 1.0 

b. 2.0 

c. 3.0 

d. 4.0 


Answer- 2.0


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

a. Primary structure 

b. Secondary structure 

c. Tertiary structure 

d. Quaternary structure 


Answer- Primary structure


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

a. Hydrophobic 

b. Hydrophilic 

c. Basic 

d. None of these 


Answer- Hydrophobic


Que- Hemoglobin molecule exhibits which structural organization of proteins 

a. Primary structure 

b. Secondary structure 

c. Tertiary structure 

d. Quaternary structure 


Answer- Quaternary structure


Que- Which of the following does not show quaternary structure? 

a. Haemoglobin 

b. Pepsin 

c. Fibrin 

d. Insulin 


Answer- Fibrin


Que- Which structural organization is most common in globular proteins? 

a. Primary 

b. Secondary 

c. Tertiary 

d. Quaternary 


Answer- Tertiary


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

a. Globular proteins 

b. Fibrous Proteins 

c. Both a and b 

d. None of these 


Answer- Fibrous Proteins


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

a. Globular proteins 

b. Fibrous Proteins 

c. Both a and b 

d. None of these 


Answer- Globular proteins


Que- ATP is a an important molecule for its major function 

a. As an energy currency of the cell 

b. As a coenzyme 

c. Both a and b 

d. None of these 


Answer- As an energy currency of the cell


Que- Each turn of DNA contain _______ nitrogenous base pairs 

a. 5.0 

b. 10.0 

c. 20.0 

d. 25.0 


Answer- 10.0


Que- The first organism of whose genome was completely discovered was 

a. Human beings 

b. Influenza Virus 

c. Hemophilus Influenza 

d. None of these 


Answer- Hemophilus Influenza


Que- Which of the following statement is incorrect about RNA? 

a. The pentose sugar in it is Ribose. 

b. It contains Adenine Guanine Thymine and Cytosine 

c. It is present in the nucleoli 

d. It may be folded back on itself to give double helical characteristics. 


Answer- It contains Adenine Guanine Thymine and Cytosine


Que- rRNA constitutes _____ % of the total cellular RN 

a. 3-4 % 

b. 10-20% 

c. 0.8 

d. 0.9 


Answer- 0.8


Que- There are mainly _______ types of tRNA 

a. 170.0 

b. 20.0 

c. 25.0 

d. 15.0 


Answer- 20.0


Que- Most of the cellular secretions are _____ in nature. 

a. Glycolipids 

b. Glycoproteins 

c. Nucleohistones 

d. Proteins 


Answer- Glycoproteins


Que- Which conjegated molecules play important role in gene expression? 

a. Glycolipids 

b. Glycoproteins 

c. Nucleohistones 

d. None of these 


Answer- Nucleohistones


Que- The survival of an animal depends upon its ability to take some from its environment 

a. Chemicals 

b. Hydrocarbons 

c. Organic molecules 

d. Inorganic molecules 


Answer- Organic molecules


Que- Interconversion of carbohydrates proteins and lipids in living cells are an example of 

a. Coordinated catabolic activities 

b. Coordinated anabolic activities 

c. Both A and B 

d. Any one 


Answer- Both A and B


Que- Carbon commonly combines with 

a. H 

b. N & O 

c. P & S 

d. All of these 


Answer- All of these


Que- Non polar organic molecules are _______ in water. 

a. Soluble 

b. Insoluble 

c. Partially soluble 

d. Depends upon condition 


Answer- Insoluble


Que- In living organisms the lubricant which provides protection against damage resulting from friction is 

a. Carbohydrates 

b. Fatty acid 

c. Water 

d. Protein 


Answer- Water


Que- In Cx(H2O)y x ranges from 

a. 1 to 3 thousand 

b. 3 to many thousand 

c. 3 to 5 thousand 

d. 5 to 9 thousand 


Answer- 3 to many thousand


Que- Glycolipids and glycoproteins have structural role in the _____ matrix of animal and bacterial cell 

a. Extracellular 

b. Intracellular 

c. Both of these 

d. Glucose 


Answer- Extracellular


Que- The trioses which are intermediate in respiration and photosynthesis are 

a. Glyceraldehydes 

b. Dihydroxy acetone 

c. Both of these 

d. None of these 


Answer- Both of these


Que- Keto group is represented as 

a. CO 

b. C-COO-C 

c. HCOH 

d. HOH 


Answer- CO


Que- The monosaccharide found in some bacteria and occurring rarely are 

a. Trioses 

b. Hexoses 

c. Tetroses 

d. Pentoses 


Answer- Tetroses


Que- How many carbon atoms are required to form a furan ring (ribofuranose) 

a. 3.0 

b. 4.0 

c. 5.0 

d. 2.0 


Answer- 4.0


Que- In esterification OH comes from 

a. Organic acid 

b. Alcohol 

c. Water 

d. Sugar 


Answer- Alcohol


Que- Triglyceride is also known as 

a. Natural lipid 

b. Neutral lipid 

c. Neutral wax 

d. All of these 


Answer- Neutral lipid


Que- Which one is not found in fatty acids in acylglycerols? 

a. C-6 

b. C-25 

c. C-26 

d. C-30 


Answer- C-25


Que- Animals fats are ___________ atroom temperature 

a. Liquids 

b. Gases 

c. Solids 

d. None of these 


Answer- Solids


Que- Biological molecules (proteins) which catalyze a biochemical reaction and remain unchanged after completion of reaction are called 

a. Cofactor 

b. Coenzymes 

c. Activator 

d. Enzymes 


Answer- Enzymes


Que- Which statement about enzyme is incorrect: 

a. Some of them consist solely of protein with no non protein part. 

b. They catalyze a chemical reaction without being utilized. 

c. All enzymes are fibrous Proteins. 

d. They without their cofactor are called apoenzyme. 


Answer- All enzymes are fibrous Proteins.


Que- In which of the following location enzymes controlling cellular respiration are present? 

a. Nucleus 

b. Chlorophast 

c. Milochondria 

d. Ribosome 


Answer- Milochondria

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