Tag: biology

Questions Related to biology

Penicillin will be unaffective against ___________________.

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  1. Mycoplasma, Slime moulds and Psedomonas

  2. Staphyloccus, Mycoplasma & Animal cell

  3. Slime moulds, Aspegillus & Psedomonas

  4. Mycoplasma, Animal cell & Slime moulds

Show answer
Correct Option: A

Fleming discovered Penicillin from

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  1. Penicillium notatum

  2. P. roqueforti

  3. P. camemberti

  4. P. chryaogenum

Show answer
Correct Option: A
Explanation:
  • Discovery of penicillin antibiotic by Fleming was an accidental discovery.
  • Fleming was working with different bacterial strains to study the effect of lysozyme in fighting of bacterial infection in human body.
  • In his lab there were many petri dish containing different strains of bacteria, he observed that one of the petridishes containing the strain for bacteria  Staphylococcus was infected by the growth of a fungus
  • This fungus growing along with the bacterial colony inhibited the growth of the bacterial colony
  • On further observation Fleming saw that the chemical substances secreted by the mold inhibited the bacterial growth. He named it Penicillin after the name of the organism ie Penicillium notatum
  • So, the correct answer is Penicillium notatum 

In 1928, a scientist discovered the first effective antibiotic. Scientist and antibiotics are

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  1. Fleming - Streptomycin

  2. Fleming - Penicillin

  3. Waksman - penicillin

  4. Waksman - streptomycin.

Show answer
Correct Option: B
Explanation:
  • In September 1928 when Alexander Fleming observed his Petri dishes of the bacterial culture he notice that the culture of bacteria Staphylococcus has a mold growing over it which has inhabited its growth in that area.
  • Upon observing he found that the mold was a strain of fungus Penicillium notaum and its was secreting some substance which inhibited the growth of the bacteria.
  • He named it penicillin after the organism from which it is secreted.
  • So the answer Alexander Fleming who discovered the first antibiotic penicillin is correct.

Ernest Chain and Howard Florey's contribution was.

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  1. Discovery of streptokinase

  2. Establishment of potential of penicillin as effective drug

  3. Discovery of DNA sequences

  4. Isolating the bacterial plasmid

  5. Production of genetically engineered insulin

Show answer
Correct Option: B

The culture and fungal invader in discovery of penicillin by Alexander Fleming are

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  1. Vibrio cholerae and Penicillium requeforti

  2. Staphylococcus aureus and Penicillium notatum

  3. Eacherichia coli and Penicillium chrysogenum

  4. Clostridium tetani and Penicillium chrysogenum

Show answer
Correct Option: B
Explanation:

The discovery of Penicillin was a case of serendipity and it was observed on a culture plate of Staphylococcus aureus that was contaminated by a fungus species. 

So, the correct option is "Staphylococcus aureus and Penicillium notatum".

Choose the correct combination.

a Walter Sutton $1$ Discovered penicillin
b Thomas Hunt Morgan $2$ Discovered chromosomal basis of heredity
c James Watson $3$ Described the phenomenon of linkage and crossing over
d Alexander Fleming $4$ Discovered double helical structure of DNA
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  1. a-$1$, b-$4$, c-$2$, d-$3$

  2. a-$2$, b-$3$, c-$1$, d-$4$

  3. a-$3$, b-$2$, c-$1$, d-$4$

  4. a-$2$, b-$3$, c-$4$, d-$1$

  5. a-$4$, b-$1$, c-$2$, d-$3$

Show answer
Correct Option: D
Explanation:

  • Sutton deduced that chromosomes are the basis of heredity and that the reduction of chromosomes in meiosis is directly related to Mendel's laws of inheritance.
  • Thomas Hunt Morgan described the phenomenon of linkage and crossing over. Morgan imagined that genes on chromosomes were similar to pearls on a string, in other words, they were physical objects. The closer two genes were to one another on a chromosome, the greater their chance of being inherited together. In contrast, genes located farther away from one another on the same chromosome were more likely to be separated during recombination. Therefore, Morgan correctly proposed that the strength of linkage between two genes depends upon the distance between the genes on the chromosome. This proposition became the basis for construction of the earliest maps of the human genome.
  • James Dewey Watson discovered the structure of DNA in 1953 with Francis Crick.
  • Scottish bacteriologist Alexander Fleming accidentally discovered the antibiotic in 1928, when he came back from a vacation and found that a green mold called Penicillium notatum had contaminated Petri dishes in his lab and were killing some of the bacteria he’d been growing.

So, the correct answer is 'a-2, b-3, c-4, d-1'.

Which of the following statement is incorrect about antibiotics?

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  1. Coined by Waksman (1942)

  2. Produced by microorganisms

  3. Produce allergy in some persons

  4. Cure all diseases

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Correct Option: D
Explanation:

Antibiotic is a medicine which inhibits the growth of microbes. This term was coined by Selman Waksman. They are produced by many bacteria, fungi, and other microorganisms. Some of them increase the activity of mast cell resulting into allergy. They are specific for the disease.

So, the correct answer is 'Cure all diseases'

Match the following and find the correct option.

I II
(a) Cristian Haneen (i) Vaccination
(b) Waksman (ii) Penicillin
(c) Edward Jenner (iii) Purification of enzyme zennet
(d) Alaxander Fleming (iv) streptomycin
biology aids to health antibiotics and their uses common health care methods immunization, treatment and antibiotics first aid

  1. a-iv, b-i, c-ii, d-iii

  2. a-iii, b-i, c-iv, d-ii

  3. a-iii, b-ii, c-i, d-iv

  4. a-iii, b-iv, c-i, d-ii

Show answer
Correct Option: D
Explanation:

(A)Cristian Haneen verified the Purification of enzyme zennet.

(B)Waksman discovered Streptomycin.
(C)Edward Jenner discovered Vaccination.
(D)Alexander Fleming discovered Penicillin.
So, the correct option is 'a-iii, b-iv, c-i, d-iii'.

The term antibiotic was coined by

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  1. Fleming

  2. Waksman

  3. Funk

  4. Jenner

Show answer
Correct Option: B
Explanation:

Selman Waksman, the microbiologist who discovered streptomycin, first used the word "antibiotic" in the medical sense in 1943. 

So the correct answer is 'Waksman'

Which of the following statement is correct?

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  1. Activated sludge is digested by anaerobic bacteria to produce marsh gas.

  2. Aspergillus niger produces cyclosporin A.

  3. Fleming, Chain and Florey were awarded Nobel Prize for discovering penicillin.

  4. BOD is amount of oxygen produced by bacteria during decomposition.

Show answer
Correct Option: C