Biology Practice MCQ Page 32

Multiple Choice questions for Biology in the sets of 10 each on one page with questions and answers. All sets are useful in the preparation of subject tests for employment or admission.
Question: 2473   Which of the following is less resistance to antibiotics?
  1. Escherechia coli
  2. Gram positive bacteria
  3. Gram negative Bacteria
  4. None of the above
Question: 2474   It is the process of genetic recombination between two organisms through a cytoplasmic bridge between them.
  1. Transduction
  2. Transformation
  3. Conjugation
  4. None of the above
Question: 2476   Who along with Edward Tatum in 1946 worked on red on related strains of bacteria and demostrated that conjugation takes place in bacteria .
  1. Straberg
  2. Joshua Lederberg
  3. Darwin
  4. Mendel
Question: 2479   The sexual reproduction in bacteria was reported by the scientist
  1. Wastsonn $ Crick
  2. Kornbe and Ochoa
  3. Lederberg and Tatum
  4. Robert Koch
Question: 2482   During the process of-------- gense can be transferred from one bacterium to another by a third party,a bacteriophage.
  1. Transformation
  2. Congugation
  3. Transformation $ Conjugation.
  4. Transduction
Question: 2487   During conjugation in E.Coli,
  1. a part of the chromosome is usually transferred to the female bacteria in which it replaces the hormologous part of DNA
  2. a part of the chromosome is usually transffered to the female bacterium in which it adds to the DNA of the female bacterium
  3. the whole chromosome of the male bacterium is generally passed into the female cell
  4. both a & b
Question: 2498   The bacterium which reduces the fertility of soil is
  1. Nitrosomonas sp
  2. Azotobacter sp
  3. Nitrobacter sp
  4. Bacillus dentificans
Question: 2499   Diphtheria disease is caused by
  1. Corynebacterium diphtheria
  2. Diplococus pneumo
  3. Pasteurella pestis
  4. Streptomyces species
Question: 2500   The harmful poisonous substances produced by bacteria are called
  1. Toxins
  2. Antitioxins
  3. Antibiotic
  4. Aflatoxins
Question: 2501   Dried milk dried meat are examples of preservation by
  1. Pasteunization
  2. Dehydration
  3. Strerilization
  4. None of the above
Question: 2502   Pickles, candies ,jams and breads are preserved by the much of adding
  1. Preservattives
  2. Enzymes
  3. Minerals
  4. None of the above
Question: 2503   Chemicals like -------- may be added to different foods or fruits to prevent or retard the growth microorganisms
  1. Potasium
  2. Calcium
  3. Potassium metabisulphite
  4. Sulphur

Answers to the questions of Biology on this page

Following list gives the correct choice for the answer of the Biology mcqs.
2473 . C       2474 . C       2476 . B       2479 . C       2482 . D       2487 . A       2498 . D       2499 . A       2500 . A       2501 . B       2502 . A       2503 . C      

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