Biology

Antibiotics and Immunity

974 Questions

Prepare for your science sections with these questions on antibiotics and immunity. The hub covers various classes of antibiotics, their sources, and mechanisms of microbial resistance. It also addresses the human antiviral response.

Antibiotic classes and sourcesMicrobial resistance mechanismsAntiviral proteinsDisease treatments

Antibiotics and Immunity Questions

Multiple choice

Match the following diseases with their treatments.

Peptic ulcer DPT Hib
Tuberculosis Amoxicillin
Whooping cough BCG
  1. Peptic ulcer BCG
    Tuberculosis Amoxicillin
    Whooping cough DPT Hib
  2. Peptic ulcer DPT Hib
    Tuberculosis BCG
    Whooping cough Amoxicillin
  3. Peptic ulcer Amoxicillin
    Tuberculosis DPT Hib
    Whooping cough BCG
  4. Peptic ulcer Amoxicillin
    Tuberculosis BCG
    Whooping cough DPT Hib
  5. Peptic ulcer BCG
    Tuberculosis DPT Hib
    Whooping cough Amoxicillin
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Yes, it is the correct answer. Peptic ulcer is treated by Amoxicillin, an antibiotic. Tuberculosis is treated by BCG, and whooping cough is treated by  DPT Hib.

Multiple choice

The antibiotic penicillin is obtained from

  1. Penicillium camemberti

  2. Penicillium bilaiae

  3. Penicillium chrysogenum

  4. Penicillium candidum
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Penicillium chrysogenum is common in damp or water damaged buildings. It is the source of several β-lactam antibiotics. The most important antibiotic penicillin is obtained from it.

Multiple choice

The bacteria present as a commensal on human skin is

  1. Solobacterium moorei

  2. Staphylococcus aureus

  3. Staphylococcus capitis

  4. Staphylococcus caprae
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

It is found as a commensal on human skin, but has also been involved in infections of the bloodstream, urinary tract, bones and joints.

Multiple choice

Which of the following statements is false regarding antibiotics?

  1. The term was given by Waksman.

  2. They are produced by microorganisms.

  3. They either kill bacteria or keep them for reproducing.

  4. They do not fight infections caused by virus such as cold and flu.

  5. They may cause at least some relief in case of viral infection.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Each time the antibiotics are taken, it increases the chances that bacteria in the body will be able to resist them. Later, we could get or spread an infection that those antibiotics cannot cure.

Multiple choice

A researcher observed zone of inhibition of a fungus among bacterial colonies. He presumed it to be due to antibiotic production, which is a _______.

  1. primary metabolite

  2. secondary metabolite

  3. tertiary metabolite

  4. quaternary metabolite
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Secondary metabolite: Primary metabolites produced by microorganisms are enzymes, vitamins, etc., that are required for their own living. Secondary metabolites are antibiotics that help them to survive in their surroundings, by inhibiting other organisms.

Multiple choice

During antibiotic as erythromycin production by Streptomyces erythreus the following data was collected. 1 hour (100 cells, 0 erythromycin); 5 hours (1500 cells, 15 units erythromycin); 10 hours (25,000 cells, 35 units erythromycin); 15 hours (65,000 cells, 45 units erythromycin); 20 hours (64,000 cells, 60 units erythromycin); 25 hours (50,000 cells, 50 units erythromycin).

How many cells were present in the log phase of Streptomyces erythreus?

  1. 65,000

  2. 64,000

  3. 50,000

  4. 25,000
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

25,000: log phase means when the cells are rapidly growing and at their maximum rate of division. Here log phase is in 10th hour and correspondingly, number of cells = 25,000.

Multiple choice

During antibiotic as erythromycin production by Streptomyces erythreus the following data was collected. 1 hour (100 cells, 0 erythromycin); 5 hours (1500 cells, 15 units erythromycin); 10 hours (25,000 cells, 35 units erythromycin); 15 hours (65,000 cells, 45 units erythromycin); 20 hours (64,000 cells, 60 units erythromycin); 25 hours (50,000 cells, 50 units erythromycin).

Which is the most suitable time for harvesting erythromycin?

  1. 10 hours

  2. 15 hours

  3. 20 hours

  4. 25 hours
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

25 hours: even though, maximum yield of erythromycin is at 20th hour (60 units) but all product are harvested at the end of fermentation, i.e. 25 hours here.

Multiple choice

What is the meaning of antiseptic?

  1. Something which is healthy to eat

  2. Something that kills germs

  3. Something which one should drink

  4. Something that makes you beautiful

  5. Something to wash hairs
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Antiseptic are the lotions and creams that kills germs. One should keep immediately on the wound or injury to kill germs.

Multiple choice

Antibiotic penicillin acts against bacteria by which of the following ways?

  1. Killing the bacteria.

  2. Blocking nutritional pathways for the bacteria.

  3. Neutralizing the bacteria.

  4. Blocking biochemical pathways important for bacteria.

  5. Reducing the effect of the bacteria.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Antibiotic penicillin blocks biochemical pathways important for bacteria. This inhibits the growth of bacteria or kills it.