Bacterial Culture Measurement Quiz

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What is the purpose of measuring the diameter of the bacterial culture and the clear agar jelly in the center?

To establish the radius of the circles

To identify the bacteria present

To determine the effectiveness of the antibiotic

To calculate the area of the circles (correct)

Why is it important to calculate the area of the circles in the context of antibiotic testing?

To evaluate the effectiveness of the antibiotic (correct)

To assess the toxicity of the antibiotic

To compare the sizes of different bacterial cultures

To determine the dosage of the antibiotic

What does a higher percentage of bacterial culture destroyed by an antibiotic indicate?

The bacterial culture is resistant

The antibiotic is more effective (correct)

The antibiotic is toxic to humans

The antibiotic is ineffective

In the context of developing new medicines, what role do preclinical testing and clinical trials play?

Testing for toxicity and efficacy Signup and view all the answers

What is the main source of new drugs today according to the text?

Synthesis by chemists Signup and view all the answers

Why is it useful to determine the effectiveness of different bacteria/antibiotic combinations?

To determine which antibiotics are most effective for specific infections Signup and view all the answers

Why are antibiotics ineffective against viruses?

Viruses do not use cell machinery in host cells to reproduce. Signup and view all the answers

What is the main purpose of agar gel in bacterial culture?

To act as a solid medium for bacterial colony formation Signup and view all the answers

Which type of infection can be effectively treated with antibiotics?

Bacterial infection Signup and view all the answers

Why is it important to stopper the flask with cotton wool when using the nutrient broth solution for bacterial culture?

To avoid contamination from air-borne microorganisms Signup and view all the answers

What makes viruses and other pathogens different from bacteria in terms of antibiotic susceptibility?

Their use of host cell machinery for reproduction Signup and view all the answers

Why is it necessary to shake the nutrient broth solution regularly during bacterial culture?

To mix the nutrients and oxygen for bacteria evenly Signup and view all the answers

What did Alexander Fleming observe in his bacterial culture plates?

Mould with clear rings around it Signup and view all the answers

Which substance produced by the mould killed the bacteria in Alexander Fleming's experiment?

Penicillin Signup and view all the answers

What is the purpose of using a placebo in clinical drug testing?

To observe the effect of the new drug Signup and view all the answers

In a double-blind drug test, who knows whether the patient is receiving the drug?

Neither the patient nor the doctor Signup and view all the answers

What kind of testing involves the use of cells, tissues, and live animals before human trials?

Preclinical testing Signup and view all the answers

Why do drugs need to undergo peer review by other scientists?

To check for repeatability of results Signup and view all the answers