Biology MCQ (Multiple Choice Questions) - SchoolingAxis

Biology MCQ (Multiple Choice Questions)

 Que- An activated enzyme consisting of polypeptide chain and a cofactor is called: 

a. Apoenzyme 

b. Holoenzyme 

c. Activated enzyme 

d. Both b and c 


Answer- Both b and c


Que- Which one forms the raw material for coenzymes? 

a. Vitamins 

b. Carbohydrates 

c. Proteins 

d. Metals 


Answer- Vitamins


Que- A cofactor made of inorganic ion which is detachable is called 

a. Prosthetic group 

b. Coenzyme 

c. Activator 

d. Cofactor 


Answer- Activator


Que- Enzymes _________ the activation energy of a chemical reaction 

a. Increases 

b. Decreases 

c. Does not effect 

d. Increases or decreases depending upon individual enzyme 


Answer- Decreases


Que- A three dimensional dcavity bearing a specific charge by which the enzyme reacts with its substrate is called 

a. Active site 

b. Binding site 

c. Catalytic site 

d. Allosteric site 


Answer- Active site


Que- Which step causes activation of catalytic site of an enzyme? 

a. Change in pH of the surroundings. 

b. Formation of Enzyme Susstrate complex. 

c. Change in the charge of the active site. 

d. Change in temperature 


Answer- Formation of Enzyme Susstrate complex.


Que- Lock and Key model was proposed by 

a. Emil Fischer 

b. Koshland 

c. Robin Williams 

d. Rudolph Virchow 


Answer- Emil Fischer


Que- Which statement is incorrect about Lock and Key Model? 

a. Specific enzyme can transform only a specific substrate 

b. Active site of an enzyme is a non flexible structure. 

c. Active site does not change before during or even after the reaction. 

d. It explains the mechanism of every chemical reaction. 


Answer- It explains the mechanism of every chemical reaction.


Que- The rate of reaction is directly proportional to the concentration of an enzyme which statement is incorrect in this respect: 

a. Increase in enzyme molecule increases the available active sites. 

b. This relation is for unlimited time period with unlimited enzyme concentration 

c. If the concentration is doubled the rate will become two fold. 

d. None of these. 


Answer- This relation is for unlimited time period with unlimited enzyme concentration


Que- If the concentration of enzyme is kept constant and amount of substrate is increased a point is reached where increase in substrates concentration does not affect the reaction rate because of 

a. Enzymes get denatured at higher substrate conc. 

b. Rate of reaction is indirectly proportional to substrate concentration at this point. 

c. All the active sites on enzyme molecule are occupied. 

d. None of these. 


Answer- All the active sites on enzyme molecule are occupied.


Que- If more substrate to already occurring enzymatic reaction is added more enzyme activity is seen because: 

a. There is probably more substrate present than there is enzyme. 

b. There is probably more enzayme available than there is substrate. 

c. There is probably more product present than there is either substrate or enzyme. 

d. The enzyme substrate complex is probably failing to form during the reaction. 


Answer- There is probably more enzayme available than there is substrate.


Que- If more substrate to already occurring enzymatic reaction is added and there is no effect on the rate of the reaction what is the form given to this situation: 

a. Saturation 

b. Denaturation 

c. Composition 

d. Inhibition 


Answer- Saturation


Que- The active site of an enzyme: 

a. Never changes 

b. Forms no chemical bond with substrate 

c. Determined by structure and the specificity of the enzyme. 

d. They are non specific in their action. 


Answer- Determined by structure and the specificity of the enzyme.


Que- Excessive increase in temperature of medium causes the enzyme molecule to 

a. Activate 

b. Unaffected 

c. Denatured 

d. None of these. 


Answer- Denatured


Que- Extreme change in pH results in: 

a. Change in ionization of amino acids at the active site of the enzyme. 

b. Change in the ionization of the substrate. 

c. Denaturation of the enzyme 

d. Increase in the reaction rate. 


Answer- Denaturation of the enzyme


Que- A chemical substance which can react (in place of substrate) with the enzyme but is not transformed into product/s and thus blocks the active site temporarily or permanently is called 

a. Co-enzyme 

b. Blocker 

c. Inhibitor 

d. Cofactor 


Answer- Inhibitor


Que- Inhibitors which block the enzyme by forming weak bond are called 

a. Competitive inhibitors. 

b. Non-competitive inhibitors 

c. Irreversible inhibitors. 

d. Both a and b 


Answer- Both a and b


Que- A substance which binds at the active site of the enzyme but does not result in the formation of the products is called: 

a. Irreversible inhibitor 

b. Reversible inhibitor 

c. Competitive inhibitor 

d. Non-competitive inhibitor 


Answer- Competitive inhibitor


Que- The structure of an enzyme is altered by: 

a. Irreversible inhibitor 

b. Reversible inhibitor 

c. Competitive inhibitor 

d. Non-competitive inhibitor 


Answer- Irreversible inhibitor


Que- Malonic acid is an example of: 

a. Irreversible inhibitor 

b. Reversible inhibitor 

c. Competitive inhibitor 

d. Non-competitive inhibitor 


Answer- Competitive inhibitor


Que- If enzyme concentration is low than substrate pH and temperature values are equal to requirement then which of the following will increase rate of reaction. 

a. increase in concentration of enzyme 

b. increase in concentration of substrate 

c. increase in pH 

d. increase in temperature 


Answer- increase in concentration of enzyme


Que- Which of the following category is most general with its members lest resembling with each other than the other categries: 

a. Species 

b. Genus 

c. Family 

d. Order 


Answer- Order


Que- Solanum tuberosum is a scientific name of: 

a. Onion 

b. Amaltas 

c. Potato 

d. Tomato 


Answer- Potato


Que- Allium cepa is the scientific name of : 

a. Onion 

b. Amaltas 

c. Potato 

d. Tomato 


Answer- Amaltas


Que- Those organisms which can prepare their own food from simple inorganic material and can store energy are called 

a. Autotrophs 

b. Heterotrophs 

c. Procariotique 

d. Eu-cariotique 


Answer- Autotrophs


Que- Which of the Euglenas (a Protoctista) character resembles that of animals: 

a. They can move 

b. They lack cell wall 

c. They do not have chlorophyll 

d. Both a and b 


Answer- Both a and b


Que- The word which E-Chatton suggested for bacteria and blue green algae was: 

a. Autotrophs 

b. Heterotrophs 

c. Pro-cariotique 

d. Eu-cariotique 


Answer- Pro-cariotique


Que- Organisms of which of the following kingdom have absorptive mode of nutrition: 

a. Prokaryotae 

b. Protoctista 

c. Animalia 

d. Fungi 


Answer- Fungi


Que- Which of the following organisms have Chitin as a major structural component of their cell wall: 

a. Prokaryotae 

b. Protoctista 

c. Plantae 

d. Fungi 


Answer- Fungi


Que- Five kingdom classification was proposed by : 

a. Carlous Linnaeus 

b. E-Chatton 

c. Robert Whittaker 

d. Lynn Margulis and Karlene Schwartz 


Answer- Robert Whittaker


Que- Amoeba belongs to which kingdom: 

a. Prokaryotae 

b. Plantae 

c. Monera 

d. Protista 


Answer- Protista


Que- Kingdom Protoctista includes: 

a. Prokaryotic organisms 

b. Unicellular organisms 

c. Fungi 

d. Eu-cariotiquic organisms 


Answer- Fungi


Que- Other name for Kingdom monera is: 

a. Protoctista 

b. Prokaryotae 

c. Archae 

d. None of these 


Answer- Prokaryotae


Que- The word virus is derived from Latin word venome meaning 

a. Sweet fluid 

b. Sore Fluid 

c. Poisonous Fluid 

d. Salty Fluid 


Answer- Poisonous Fluid


Que- DNA or RNA of viruses is enclosed in ______ coat: 

a. Protein 

b. Carbohydrate 

c. Lipid 

d. DNA 


Answer- Protein


Que- Vaccine Was discovered by : 

a. Louis Pasteur 

b. Edward Jennar 

c. Ivanowski 

d. Stanely 


Answer- Edward Jennar


Que- The name Bacteriophage was coined by: 

a. Charles Chamberland 

b. Ivanowski 

c. Twort 

d. D Herelle 


Answer- D Herelle


Que- The size of smallest virus is: 

a. 10 nm 

b. 20 nm 

c. 30 nm 

d. 40 nm 


Answer- 20 nm


Que- The size of poxvirus is: 

a. 20 nm 

b. 200 nm 

c. 250 nm 

d. 300 nm 


Answer- 250 nm


Que- Viruses are ______ smaller than bacteria 

a. 10 - 100 times 

b. 10 - 1000 times 

c. 100 - 1000 times 

d. 1000 - 10000 times 


Answer- 10 - 1000 times


Que- Which of the statement about viruses is incorrect : 

a. We can not grow them in laboratories on artificial medias 

b. They are obligate intracellular parasite. 

c. They can synthesize their nucleic acid 

d. They are resistant to most of antibiotic treatment 


Answer- They can synthesize their nucleic acid


Que- Protein subunits of capsid is called the capsomeres is a characteristic of each virus. Their number in Herpes virus is: 

a. 100.0 

b. 152.0 

c. 162.0 

d. 172.0 


Answer- 162.0


Que- Protein coat the capsid of adenovirus is : 

a. Surrounded by genome 

b. Surrounding genome 

c. Surrounding the envelope 

d. Both B and C 


Answer- Surrounding genome


Que- The agent of controversial nature causing mad cow infection is: 

a. Bacteria 

b. Cowpox Virus 

c. Adenovirus 

d. Prion 


Answer- Prion


Que- A virion is : 

a. Virus 

b. Viral protein 

c. Viral lysozyme 

d. Viral gene 


Answer- Virus


Que- An isolated virus is not considered living since it: 

a. Separates in to two inner parts 

b. Can not metabolize 

c. Rapidly looses its Genome chemical inert 

d. Is coated with an air tight shield 


Answer- Can not metabolize


Que- Bacteriopahage that infect E. coli are called: 

a. M type 

b. N type 

c. T type 

d. S type 


Answer- T type


Que- Attachment of the bacteriophage with the receptor site on the bacterial cell wall involves: 

a. Strong covalent bond between virion and the receptor site. 

b. Week chemical unior between them 

c. Both A and B depending upon the phage 

d. None of these 


Answer- Week chemical unior between them


Que- In life cycle of bacteriophage which step occur after attachment of prophage with the receptor site of the bacterial cell wall: 

a. Absorption 

b. Multiplication 

c. Lysogeny 

d. Penetration 


Answer- Penetration


Que- Which of the following is incorrect for the lysogenic cycle in life cycle of bacteriophage: 

a. Phage when gets incorporated with the bacterial chromosome is called prophage. 

b. The bacterium continues to live and reproduce normally 

c. Lysogenic bacteria may get infected by the related phage. 

d. The cycle may convert into lytic type resulting from environmental exposure. 


Answer- Lysogenic bacteria may get infected by the related phage.


Que- In lysogenic cycle the process of spearation of phage DNA from the hosts chromosome and initiation of lytic cycle is called: 

a. Lysis 

b. Lysogeny 

c. Induction 

d. Adsorption 


Answer- Induction


Que- In the lytic cycle of bacteriophage the host DNA is: 

a. Replicated 

b. Turn off by the protein coat. 

c. Digested into its nucleotides 

d. Turned on by the removal of the protein coat 


Answer- Digested into its nucleotides


Que- In the Lysogenic cycle the DNA of the bacteriophage: 

a. Joins the bacterial chromosomes. 

b. Attaches to the inner surface of the host membrane 

c. Is immediately degraded when enters the host. 

d. Goes directly to host ribosomes for translation 


Answer- Joins the bacterial chromosomes.


Que- Temperate phage may exist as : 

a. Prophage 

b. Capsid 

c. Viron 

d. Retrovirus 


Answer- Prophage


Que- Tobacco mosaic virus is : 

a. Spherical 

b. Rod Shaped 

c. Tadpole like 

d. Hexagonal 


Answer- Rod Shaped


Que- Which of the following is an RNA virus: 

a. Influenza virus 

b. Herpes virus 

c. HBV 

d. Pox virus 


Answer- Influenza virus


Que- An enzyme which can convert single stranded RNA into double stranded viral DNA is called: 

a. DNAase 

b. RNAase 

c. DNA polymrase 

d. Reverse Transcriptase 


Answer- Reverse Transcriptase


Que- Which of the following virus has special affiliations with the tumor production: 

a. Hepatitis virus 

b. Retrovirus 

c. Polio virus 

d. Pox virus 


Answer- Retrovirus


Que- Which of the following is the smallest known virus: 

a. Hepatitis virus 

b. Retrovirus 

c. Polio virus 

d. Pox virus 


Answer- Polio virus


Que- Complex symptoms like severe pneumonia vascular tumor sudden weight loss swollen lymph nodes and immune deficiency are features of: 

a. Polio 

b. Hepatitis 

c. AIDS 

d. HIV 


Answer- AIDS


Que- Which of the following statement about AIDS is incorrect: 

a. is a host specific disease 

b. An infected mother cannot pass the virus to her baby. 

c. Results in enlargement of lymph nodes 

d. Can be prevented. 


Answer- An infected mother cannot pass the virus to her baby.


Que- Mode of transmission of hepatitis A is : 

a. Serum 

b. Faeco-oral 

c. Sexual contact 

d. All of these 


Answer- Faeco-oral


Que- Which one of the following specially result in chronic liver disease leading to hepatic failure: 

a. HAV 

b. HBV 

c. HCV 

d. HEV 


Answer- HCV


Que- For which of the following no preventive vaccine is available 

a. HAV 

b. HBV 

c. HCV 

d. HEV 


Answer- HCV


Que- The word Archaeobacteria (a division of bacteria) derived from Greek means 

a. True bacteria 

b. False bacteria 

c. Recent bacteria 

d. Ancient bacteria 


Answer- Ancient bacteria


Que- Who coined the term Animalcules for microorganisms like Bacteria and protozoa? 

a. Robert Koch 

b. Louis Pasteur 

c. Alexander Fleming 

d. Leeuwenhoek 


Answer- Leeuwenhoek


Que- Who discovered the bacteria causing tuberculosis and also developed various techniques of media preparation and maintenance of pure culture? 

a. Robert Koch 

b. Louis Pasteur 

c. Alexander Fleming 

d. Leeuwenhoek 


Answer- Robert Koch


Que- Which of the following structure is not present in all the bacteria? 

a. Cell membrane 

b. Chromatin bodies 

c. Ribosomes 

d. Capsule 


Answer- Capsule


Que- In bacterial categories the bacteria smaller in number are 

a. Gram-ive bacteria 

b. Eubacteria 

c. Ancient bacteria 

d. Gram +ive bacteria 


Answer- Ancient bacteria


Que- Germ theory of disease has ______ postulates 

a. 3.0 

b. 5.0 

c. 4.0 

d. 6.0 


Answer- 4.0


Que- Some bacteria ranging occasionally a size of 500 ?m in length are 

a. Escherichia coli 

b. Spirochetes 

c. Mycoplasma 

d. Epulopiscuim 


Answer- Spirochetes


Que- Coccobacillus has a shape similar to 

a. Diplobacillus 

b. Sarcina 

c. Egg 

d. None of these 


Answer- Egg


Que- The first bacterium isolated was 

a. Coccus 

b. Bacillus 

c. Vibrio 

d. Spirochete 


Answer- Bacillus


Que- Which of the following bacteria are thick rigid and spiral? 

a. Vibrio 

b. Spirillum 

c. Spirochete 

d. Coccus 


Answer- Spirillum


Que- A group of 8 cocci is called 

a. Diplococci 

b. Octococci 

c. Tetrad 

d. Sarcina 


Answer- Sarcina


Que- Which of the following has a chain arrangement? 

a. Streptobacillus 

b. Streptococci 

c. Staphylococci 

d. Both A and B 


Answer- Both A and B


Que- Which of the following bacteria do not have flagella commonly? 

a. Cocci 

b. Bacilli 

c. Streptobacilli 

d. Vibrio 


Answer- Cocci


Que- Flagella originate from 

a. Cell membrane 

b. Cell wall 

c. Capsule 

d. Basal body 


Answer- Basal body


Que- A bacterium with tuft of flagella at both poles is called 

a. Lophotrichus 

b. Monotrichous 

c. Peritrichous 

d. Amphitrichous 


Answer- Amphitrichous


Que- Which of the following structure primarily helps in attachment of bacteria on various surfaces? 

a. Flagella 

b. Pili 

c. Both of these 

d. None of these 


Answer- Pili


Que- Which of the following structure provides greater pathogenicity to the bacteria? 

a. Capsule 

b. Slime 

c. Cell Wall 

d. Cell membrane 


Answer- Slime


Que- Cell wall is absent in 

a. Cocci 

b. Bacilli 

c. Mycobacterium 

d. Mycoplasma 


Answer- Mycoplasma


Que- Cell wass of Archaeobacteria does not contain 

a. Peptidoglycan 

b. Proteins 

c. Glycoproteins 

d. Polysaccharides 


Answer- Peptidoglycan


Que- Gram positive bacteria appear 

a. Purple 

b. Red 

c. Pink 

d. Blue 


Answer- Purple


Que- Extremely long molecule of DNA that is tightly folded to fit inside the cell component is called 

a. Nucleus 

b. Chromosome 

c. Chromatid 

d. Chromatin body 


Answer- Chromatin body


Que- Which of the following contains genes for drug and disease resistance in bacteria? 

a. Necleotide 

b. Plasmid 

c. Mesosome 

d. Ribosome 


Answer- Plasmid


Que- The common waste material in bacteria is 

a. Glycogen 

b. Lactic acid 

c. Ammonia 

d. Urea 


Answer- Lactic acid


Que- Example of bacteria requiring low concentration of oxygen is 

a. Campylobactor 

b. spirocheta 

c. E-coli 

d. Pseudomonas 


Answer- Campylobactor


Que- Purple non-sulphur bacteria is an example of 

a. Heterotrophic bacteria 

b. Chemosynthetic bacteria 

c. Photosynthetic bacteria 

d. Saprotrophic bacteria 


Answer- Photosynthetic bacteria


Que- Those bacteria which are fully dependent upon their host for nutrition are called 

a. Heterotrophic bacteria 

b. Chemosynthetic bacteria 

c. Saprophytic bacteria 

d. Parasitic bacteria 


Answer- Parasitic bacteria


Que- Nitrifying bacteria are the examples of 

a. Hetrotrophic bacteria 

b. Chemosynthetic bacteria 

c. Saprophytic bacteria 

d. Parasitic bacteria 


Answer- Chemosynthetic bacteria


Que- E. coli and example of 

a. Aerobic bacteria 

b. Anaerobic bacteria 

c. Facultative bacteria 

d. Microaerophilic 


Answer- Facultative bacteria


Que- Spirochete is an example of 

a. Aerobic bacteria 

b. Anaerobic bacteria 

c. Facultative bacteria 

d. Microaerophilic 


Answer- Anaerobic bacteria


Que- Sex pili is formed in which of the following processes: 

a. Binary fission 

b. Mitosis 

c. Sexual reproduction 

d. Conjugation 


Answer- Conjugation


Que- Rapid growth at exponential ration occurs in which phase of bacterial growth: 

a. Lag phase 

b. Log phase 

c. Stationary phase 

d. Death / decline phase 


Answer- Log phase


Que- Chemical substances used on living tissues that inhibit the growth of micro organism are called 

a. Antiseptics 

b. Disinfectants 

c. Antibiotics 

d. Vaccines 


Answer- Antiseptics


Que- Who developed the vaccine against anthrax? 

a. Louis Pasteur 

b. Edward Jennar 

c. Leuvenhoek 

d. Alexander Fleming 


Answer- Louis Pasteur


Que- Cyanobacteria have _____ cell wall 

a. Gram +ve. 

b. Gram - ve. 

c. Acid fast 

d. Cellulose rich 


Answer- Gram - ve.


Que- Which of the following help cyanobacteria to locomote? 

a. Flagella 

b. Gas vesicles 

c. Both of these 

d. None of these 


Answer- Gas vesicles


Que- Cyanobacteria reproduce by: 

a. Binary fission 

b. Mitosis 

c. Meiosis 

d. Conjugation 


Answer- Binary fission

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