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990+ Microbiology Solved MCQs

These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Bachelor of Agriculture (BSc agri) .

Chapters

Chapter: Medical Microbiology
851.

Dengue virus is transmitted from man to man by the

A. Sand fly
B. Ticks
C. Aedes aegypti
D. Culex
Answer» C. Aedes aegypti
852.

Yellow fever is caused by

A. Bunya viru
B. Calci virus
C. Arbo virus
D. None of these
Answer» C. Arbo virus
853.

Vector for leishmaniasis is

A. Tick
B. Mite
C. Sand fly
D. Tsetse fly
Answer» C. Sand fly
854.

Splenomegaly is an important manifestation of

A. Kala-agar
B. Typhoid
C. Malaria
D. All of these
Answer» D. All of these
855.

Which of the following is most severly affected in Kala-azar?

A. Liver
B. Spleen
C. Adrenal gland
D. Bone marrow
Answer» B. Spleen
856.

In India, malaria most often spreads by

A. Anophels cucifacies
B. Anopheles fluvatis
C. Anopheles stephensi
D. Anopheles minimus
Answer» A. Anophels cucifacies
857.

Man is intermediate host for

A. Guinea Worm
B. Filaria
C. Malaria
D. Kala-azar
Answer» C. Malaria
858.

Which of the following preferably infects reticulocytes?

A. P. ovale
B. P.vivax
C. P.falciparum
D. P.malaria
Answer» B. P.vivax
859.

In which type of material parasite in the exoerythrocytic stage absent?

A. P.ovale
B. P.vivax
C. P.falciparum
D. P. malariae
Answer» C. P.falciparum
860.

In falciparum malaria, all of the following stages are seen except

A. Ring stage
B. Schizont
C. Gametocyte
D. None of these
Answer» B. Schizont
861.

Sporozite vaccine in malaria has

A. Induces antibodies
B. Prevents only asexual forms with reproduction
C. No effects on clinical illness
D. None of the above
Answer» A. Induces antibodies
862.

Growing trophozoites and schizonts are not seen in the peripheral blood in malaria due to

A. P. falciparum
B. P.vivax
C. P.ovale
D. P. malaria
Answer» A. P. falciparum
863.

Thin blood smear for malaria is used to identify

A. Plasmodium
B. Gametocytes
C. Type of parasite
D. Schizont
Answer» C. Type of parasite
864.

The radical teatment of malaria is to half

A. Gametocyte
B. Exo-erythrocytic phase
C. Erythrocytic phase
D. All of these
Answer» C. Erythrocytic phase
865.

Symptoms of acute aflatoxicosis

A. Osteogenic sarcoma
B. Lymphatic leukemia
C. Malaise & Anorexia
D. Both a and b
Answer» D. Both a and b
866.

Most important Penicillium toxins are

A. Citrinin
B. Patulin
C. Penicillic acid
D. All of the above
Answer» D. All of the above
867.

Penicillic acid is produced by

A. A. ochraceu
B. P. puberulum
C. Both a and b
D. None of the above
Answer» C. Both a and b
868.

Fungi producting mycelium are called

A. Mould
B. Filamentous fungi
C. Both a and b
D. Yeasts
Answer» A. Mould
869.

Candidiasis is caused by

A. Candida albican
B. Aspergillus spp.
C. E. floccosum
D. M. audouinii
Answer» A. Candida albican
870.

Candida albicans is capable to form

A. Single cell
B. Pseudomonas
C. Multicellular forms
D. None of these
Answer» B. Pseudomonas
871.

Aspergillus fumigatus can infect

A. A. niger
B. A. fumigatus
C. A. flavus
D. A. oryzae
Answer» D. A. oryzae
872.

A.fumigates can produce

A. Endotoxin
B. Exotoxins
C. Enterotoxins
D. None of these
Answer» A. Endotoxin
873.

The drug of choice for dermal, oral and vaginal candidiasis is

A. Griseofulvin
B. Amphotericin B
C. Gentian violet
D. Nystatin
Answer» C. Gentian violet
874.

The following Penicillium species are pathogenic except

A. P. commune
B. P. bicolor
C. P. glaucum
D. P.notatum
Answer» D. P.notatum
875.

Tinea versicolor is caused by

A. Candida albican
B. Malassezia furfur
C. Aspergillus niger
D. None of these
Answer» B. Malassezia furfur
876.

Causative agent of Tinea nigra

A. Malassezia furfur
B. Exophiala werenekii
C. Candida albicans
D. Aspergillus flavus
Answer» B. Exophiala werenekii
877.

Causative agent of African histoplasmosis

A. Histoplasma capsulatum
B. Histoplasma duboissi
C. Aspergillus niger
D. Aspergillus flavus
Answer» B. Histoplasma duboissi
878.

Sun ray fungus is

A. Actinomyces irraeli
B. Chromoblastomycosis
C. Streptomyces griseus
D. Cryptococcosis
Answer» A. Actinomyces irraeli
879.

Which agent on addition to a colony inhibits its growth and on removal the colony regrows is?

A. Bacteriostatic
B. Bactericidal
C. Antibiotic
D. Antiseptic
Answer» A. Bacteriostatic
880.

Griseofluvin is obtained from

A. Penicillium notatum
B. Streptomyces griseus
C. Penicillium griseofluvin
D. None of these
Answer» C. Penicillium griseofluvin
881.

β-lactum ring is present in

A. Erythromycin
B. Penicillin
C. Tetracyclins
D. Chloramphenicol
Answer» B. Penicillin
882.

All of the following drugs act on cell membrane, except

A. Novobiocin
B. Nystatin
C. Chloromycetin
D. Colicins
Answer» D. Colicins
883.

Cycloserine related to the amino acid in structure

A. Serine
B. Aspergine
C. Alanine
D. None of these
Answer» C. Alanine
884.

In Tuberculosis therapy mainly used antibiotic is

A. Penicillin
B. Streptomycin
C. Chloramphenol
D. Cycloserine
Answer» D. Cycloserine
885.

The antibacterial action of penicillin is due to its effect on

A. Cell membrane permeability
B. Cell wall synthesis
C. DNA synthesis
D. Protein synthesis
Answer» B. Cell wall synthesis
886.

The antibiotic produced from Bacillus subtilis is

A. Vancomycin
B. Bactiracin
C. Both a and b
D. None of these
Answer» B. Bactiracin
887.

bacitracin sensitivity test is done for

A. Pneunocci
B. Group ‘A’ Streptococci
C. Gonococci
D. Staphylococci
Answer» B. Group ‘A’ Streptococci
888.

The effect of antibiotics on micro organisms is mainly due to

A. Inhibition of cell-wall synthesis
B. Damage to the cytoplasmic membrane
C. Inhibition of nucleic acid and protein synthesis
D. All of the above
Answer» D. All of the above
889.

The antibiotic acting on cell wall is

A. Penicillin
B. Bacitracin
C. Cyclosporin
D. All of the above
Answer» D. All of the above
890.

Erythromycin belongs to chemical class of antibiotics

A. â-lactose
B. Tetracyclines
C. Macrolides
D. Aminoglycosides
Answer» C. Macrolides
891.

Bacterial resistance to antibiotics is transmitted by

A. Transduction
B. Transformation
C. Mutation
D. Plasmids
Answer» D. Plasmids
892.

Erythromycin inhibits protein synthesis by

A. Attaching to 30 S ribosome unit
B. Attaching to 50 S unit or ribosome
C. By the attachment to t-RNA
D. By the attachment to m-RNA
Answer» B. Attaching to 50 S unit or ribosome
893.

The function of (THFA) Tetrahydrofolic acid coenzyme include

A. Amino acid synthesis
B. Thymidine synthesis
C. Protein synthesis
D. Both a and b
Answer» D. Both a and b
894.

Resistant to drugs in tuberculosis develops by

A. Transduction
B. Transformation
C. Conjugation
D. Mutation
Answer» D. Mutation
895.

Which of the following is penicillinase resistang acid labile penicillin?

A. Amoxycillin
B. Cloxacillin
C. Carbenicillin
D. Methicillin
Answer» D. Methicillin
896.

Which of the following does not inhibit cell wall synthesis?

A. Penicillin
B. Carbenicillin
C. Amikacin
D. Vancomycin
Answer» C. Amikacin
897.

The anti tumor antibiotics act by inhibiting

A. Cell wall synthesis
B. RNA synthesis
C. Cell membrane synthesis
D. The DNA structure & function
Answer» D. The DNA structure & function
898.

Drug resistance to sulphonamides is due to

A. Production of PABA
B. Folic acid synthetase
C. Drug alteration
D. Low affinity for drug synthesis by bacteria
Answer» B. Folic acid synthetase
899.

Amoxycillin is combined with clavulanic acid to inhibit

A. DNA gyrace
B. Cell synthesis
C. Protein synthesis
D. β-lactamase enzymes
Answer» D. β-lactamase enzymes
900.

Drug of choice for methicillin resistant staph. Aureus is

A. Ampicillin
B. Erythromycin
C. Neomycin
D. Vancomycin
Answer» D. Vancomycin

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