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vlada-n [284]
3 years ago
15

The work of Alexander Fleming shows that ____.

Biology
2 answers:
Gennadij [26K]3 years ago
8 0

Answer: C) Not all scientific knowledge begins with an experiment

Explanation:

Fleming's lab was very messy, and one day when he is back from his vacations, he noticed that a colony of a fungus had grown as a contaminant on one of the Petri dishes sown with a bacteria called <em>Staphylococcus aureus</em>. Fleming observed a bacterial lysis, which means the death of the bacteria.

<u>The dishes got contaminated by Penicillium</u>, which is a mold that produces a an antibacterial substance, called penicillin. <u>This is an antibiotic that attacks a wide range of bacteria.</u>

At first, his findings were underestimated and he was not able to isolate this penicillin. But in 1940, Howard Florey and Ernst Chain found out that <u>this antibiotic could be used as a therapeutic agent to fight bacteria.</u>

So, in this case the discovery of penicillin was accidental, without planning a specific experiment.

Roman55 [17]3 years ago
5 0

Answer:

C

Explanation:

My science test told me so.

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Explain how myopia and hyperopia are related to the lens focusing on the retina.
liq [111]

Answer:

In myopia the image is focused ahead of the retina. While in Hyperopia the image is focused beyond or behind the retina.

Explanation:

I'll start by defining the two key terms, Myopia and Hyperopia. Myopia is otherwise called short-sightedness. It is a condition where one cannot see the images of objects located far away from the eyes and tend to see images within a short distance from the eyes. Hyperopia on the otherhand is otherwise known as long-sightedness. It is an eye defect which manifests by one not seeing objects close to the eyes instead he or she see only objects far from the eyes. These two eye defects are a malfunction of the accomodation feature of the eye.

Normally when an object is viewed all the parts of the eye (the organ for vision) function to focus the image of that object on the retina but especially on a part of it called the *light spot*. This then translates the image to the brain using the optical nerve. The brain then interpretes what is being viewed

However in Myopia, images are focused ahead of the retina . This is as a result of the eyeball being too long in relation to the focusing power of the cornea and eye lens.

In Hyperopia on the other hand, images are focused behind the retina. This is by the diameter of the eye being too short or the cornea being too flat.

In conclusion, from the above stated points,it is glaring that Myopia and Hyperopia affect the lens's ability to focus images on the retina.

4 0
3 years ago
A scientist is studying a form of marine bacteria growing in culture dishes. He noticed that a clear area formed around the mold
blondinia [14]
The answer would be C
The mold is most likely an antibiotic which produces substances harmful to the strain of bacteria and therefore any bacteria in its zone of inhibition will die as a result

hope that jhelps
4 0
3 years ago
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steposvetlana [31]
I never covered this yet but I think it's a..I hope it's right
4 0
3 years ago
Which process does not release energy?
sammy [17]
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3 years ago
The table shows results of an experiment that was
777dan777 [17]

Answer:

The correct answer is C. They are accurate and reproducible.

Explanation:

They are accurate because they are so close to the Accepted Value of 130. We can see that they are reproducible in the experiments since it had 129 twice.

8 0
3 years ago
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