Microbiology MCQ//10

   46.  Algae are always:

a.      Photosynthetic

b.      Blue-green

c.       Unicellular

d.      Eukaryotic

    47.  Which of the following doesn’t allow observation of living cells:

a.      Bright-field microscope

b.      Dark-field microscope

c.       Phase contrast microscope

d.      Fluorescence microscope

   48.  Minimal media must contains:

a.      A source of trace element

b.      Source of purine

c.       Source of pyrimidines

d.      NaCl

   49.  Enzymes that cleaves peptide bonds is called:

a.      Peptide bondase

b.      Protease

c.       Peptidase

d.      Aminoacidase

   50.  Genetic variation is accomplished in prokaryotes by all except:

a.      Mutation

b.      Sexual reproduction

c.       Conjugation

d.      transformation

Microbiology MCQ //9

   41.  Point out the Zymogenous bacteria:

a.      Pseudomonas

b.      Cytophaga

c.       Proteus

d.      Streptococcus

   42.  Exotoxin producing food poisonings organism is :

a.      Clostridium botulinum

b.      Staphylococcus aureus

c.       Bacillus cereus

d.      Serratia

   43.  When two organisms cooperatively live together, they are known as:

a.      Antagonistic

b.      Synergistic

c.       Commensals

d.      Parasitism

   44.  Which of the following genera fix nitrogen freely:

a.      Bradrynhizobium

b.      Frankia

c.       Colothrix

d.      Rhizobium

   45.  Fungal pathogens which transmit from soil to humans:

a.      Trichophyton

b.      Phytophthora

c.       Alternaria

d.      Streptomyces spp.

Microbiology MCQ//8

   36.  Which of the following viral vectors has the largest capacity for foreign DNA?

a.      Adenovirus

b.      Poxvirus

c.       Retrovirus

d.      Baculovirus

 

   37.  Which of the following is not a product of fermentation?

a.      CO2

b.      O2

c.       Ethanol

d.      Lactate

e.       All of the above

    38.  Cyanobacteria are useful as biofertilizers mainly in the field of:

a.      Sugarcane

b.      Rice

c.       Wheat

d.      Maize

   39.  The actual synthesis of DNA in E. coli is the function of

a.      Polymerase I

b.      Polymerase II

c.       Polymerase III

d.      Polymerase IV

   40.  A single enzyme is specified by a single

a.      Chromosome

b.      Gene

c.       Nucleotide

d.      Nucleoside

e.       Nucleotide

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Microbiology MCQ // 7

   31.  EcoR1 is an example of :

a.      Exonuclease

b.      Adaptor molecule

c.       Restriction endonuclease

d.      DNA gyrase

   32.  Taq polymerase is extracted from:

a.      Bacillus magaterium

b.      Escherichia coli

c.       Thermophilus aquaticus

d.      Salmonella

   33.  Which is most common form of DNA:

a.      A-DNA

b.      B-DNA

c.       C-DNA

d.      D-DNA

    34.  DNA regions that can be transcribed into RNA are called structural genes:

a.      Operator

b.      Promoter genes

c.       Regulatory genes

d.      Structural genes

    35.  Horizontal gene transfer is common in:

a.      Bacteria

b.      Humans

c.       Fungi

d.      Al the living organisms