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