1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
NemiM [27]
3 years ago
12

Alexandra fleming was working with a bacteria called staphylococcus which looked like bunches of grapes under the microscope. He

could grow colonies of these bacteria on petri dishes with a growth medium. If mold contains a substance that kills bacteria then...?
Biology
1 answer:
denis-greek [22]3 years ago
6 0

Answer:

In 1928, Sir Alexander Fleming was studying Staphylococcus bacteria growing in culture dishes. He noticed that a mold called Penicillium was also growing in some of the dishes. A clear area existed around the mold because all the bacteria that had grown in this area had died. In the culture dishes without the mold, no clear areas were present.

Fleming thought that the mold must be producing a chemical that killed the bacteria. He decided to isolate this substance and test it to see if it would kill bacteria. Fleming transferred the mold to a nutrient broth solution. This solution contained all the materials the mold needed to grow. After the mold grew, he removed it from the nutrient broth. Fleming then added the nutrient broth in which the mold had grown to a culture of bacteria. He observed that the bacteria died. He also added the same type of broth that had not been exposed to the mold, to a culture of the same type of bacteria. Nothing happened to the bacteria.

Explanation:

n 1928, Sir Alexander Fleming was studying Staphylococcus bacteria growing in culture dishes. He noticed that a mold called Penicillium was also growing in some of the dishes. A clear area existed around the mold because all the bacteria that had grown in this area had died. In the culture dishes without the mold, no clear areas were present.

Fleming thought that the mold must be producing a chemical that killed the bacteria. He decided to isolate this substance and test it to see if it would kill bacteria. Fleming transferred the mold to a nutrient broth solution. This solution contained all the materials the mold needed to grow. After the mold grew, he removed it from the nutrient broth. Fleming then added the nutrient broth in which the mold had grown to a culture of bacteria. He observed that the bacteria died. He also added the same type of broth that had not been exposed to the mold, to a culture of the same type of bacteria. Nothing happened to the bacteria.

You might be interested in
Which ecosystem has more biodiversity EXPLAIN!
Gekata [30.6K]
The two richest ecosystems lie in tropical rainforests and coral reefs. On land, tropical rainforests contain many species variation with an abundance of species in bird, mammals, amphibians, and plants. While tropical rainforests occupy only 7 percent of the Earth’s land area, they contain over half of the world’s species. This may be because species richness tends to increase with decreased elevation, increasing solar exposure, and increased precipitation; that is, hot, rainy low-land areas have the most species. In contrast, deserts have low species variation because of low precipitation. On earth, water is majorly important the equation for life. Many of the species are genetically isolated because of habitat size and variation in the build of the land (mountains, equator location, etc) such as seen in the Galapagos islands and the Amazon rainforest, both near and in South America.

Hope this helps!
7 0
3 years ago
The lowest surface temperature yet measured on any body in the solar system (–200 degrees C) occurs on
Gelneren [198K]
The answer is Triton.Triton <span>is the largest of Neptune's </span>satellites. Triton is unique as it is the only large moon in the Solar System with a rotation opposite that of its planet. The surface of Triton is mostly frozen nitrogen, with a water-ice crust and a rock and metal core.
8 0
3 years ago
Read 2 more answers
What is an organisim?
Fittoniya [83]

Answer:

<em>The definition of an organism is a creature such as a plant, animal or a single-celled life form, or something that has interdependent parts and that is being compared to a living creature. An example of an organism is a dog, person or bacteria. An example of an organism is one party in the political organism.</em>

8 0
3 years ago
Read 2 more answers
Breastfed infants typically are resistant to disease because of ________.
DochEvi [55]

Answer:

Passice immunity

Explanation:

Breast milk, produced by female mammals (including humans), besides being rich in fat and protein is full of IgA. IgA is the immunoglobulin (immune system signal proteins) that is present in body secretions, such as milk.

The baby that is fed from the mother's breast ingests these defense proteins that allow it to tolerate different pathogens and toxins.  

It is considered passive immunity, as it does not generate memory and depends on a continuous dose to maintain defense levels.

6 0
3 years ago
The sl unit for measuring
muminat

m - Meter - Length.

s - Second - Time.

A - Ampere - Electric Current.

K - Kelvin - Temperature.

kg - Kilogram - Mass.

4 0
3 years ago
Other questions:
  • fertilizers pesticides and herbicides can drain out of the soil and reach waterways like rivers lakes and oceans. this process o
    6·2 answers
  • When heart muscles cells are deprived of oxygen, the heart still pumps. what must the heart cells be able to do? transform lacta
    14·1 answer
  • 20.
    9·2 answers
  • Some of the most ancient water on earth can be found in ________.
    14·1 answer
  • The human eye has three types of cone cells. Damage to any one of the types of cone cells doesn’t cause total blindness because
    13·2 answers
  • Is a highly addictive stimulant with dental damage as a telltale sign of its use; it causes users to experience serious side eff
    11·1 answer
  • All of the following are things that help penguins stay warm a. Fat reserves b. Layers of feathers c. Swimming fast d. Staying t
    10·2 answers
  • The researcher determines that the S value (number of species at equilibrium) for the island closer to the mainland is _________
    8·1 answer
  • What happens after the gated channels close?
    14·1 answer
  • 1. Differentiate the role of the liver in the
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!