Read the scenario.

A biologist sets up an experiment to see how different antibiotics affect the growth of the bacteria Clostridium perfringens. She grows colonies of the bacteria on four different Petri dishes filled with agar, a growth medium containing nutrients for the bacteria. She then applies a different antibiotic to three of the bacteria colonies in the Petri dishes. She leaves the fourth Petri dish to grow bacteria without any antibiotic.

Each Petri dish is the same size, contains the same nutrient agar, and is placed in an incubation chamber at the same temperature. At the end of the experiment, the biologist measures the diameter of the bacteria colonies on the Petri dishes.

Question
What factors must be kept constant in the experiment to obtain valid results?

size of the Petri dish, nutrient agar, diameter of the bacteria colony

bacteria species, type of antibiotic, diameter of the bacteria colony

type of antibiotic, nutrient agar, temperature

nutrient agar, temperature, bacteria species

Question

amarellanorodrp43pnm amarellanorodrp43pnm

25-07-2022
Biology

contestada

Read the scenario.

A biologist sets up an experiment to see how different antibiotics affect the growth of the bacteria Clostridium perfringens. She grows colonies of the bacteria on four different Petri dishes filled with agar, a growth medium containing nutrients for the bacteria. She then applies a different antibiotic to three of the bacteria colonies in the Petri dishes. She leaves the fourth Petri dish to grow bacteria without any antibiotic.

Each Petri dish is the same size, contains the same nutrient agar, and is placed in an incubation chamber at the same temperature. At the end of the experiment, the biologist measures the diameter of the bacteria colonies on the Petri dishes.

Question
What factors must be kept constant in the experiment to obtain valid results?

size of the Petri dish, nutrient agar, diameter of the bacteria colony

bacteria species, type of antibiotic, diameter of the bacteria colony

type of antibiotic, nutrient agar, temperature

nutrient agar, temperature, bacteria species

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tripatsingh039 tripatsingh039 · Answer 1 · 2022-07-27T09:21:05+02:00

Factors that must be kept constant in the experiment to obtain valid results are option (c) i.e, type of antibiotic, nutrient agar, and temperature.

what are antibiotics?

A particular class of antimicrobial agents that works against bacteria is an antibiotic. Antibiotic drugs are frequently employed in the treatment and prevention of bacterial infections because they are the most effective type of antibacterial agent for doing so. Bacteria may be killed or have their growth suppressed.

They could harm the bacterial cell directly by attacking the cell wall. These cells can no longer do additional harm to the body since the bacteria cannot attack it. Other antibacterials, such as tetracycline and erythromycin, prevent the germs from multiplying or growing.

Antibiotics limit bacterial growth and replication by interfering with the bacterial cell wall. Because many types of bacteria have cell walls but human cells do not, antibiotics can kill bacteria while sparing human cells.

To know more about antibiotics refer to: https://brainly.com/question/10868637

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