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trapecia [35]
3 years ago
13

Penicillin is Choose one: A. produced by a mold and was discovered accidentally. B. a human-designed antibiotic, synthesized to

specifically target human pathogens. C. synthesized by Staphylococcus bacteria. D. naturally produced by human cells when they are infected with a bacterial pathogen.
Biology
1 answer:
NeX [460]3 years ago
4 0

Answer:

Option-A

Explanation:

Penicillin is an antibiotic drug that is derived from the fungal species of Penicillium molds especially the<em> Penicillium notatum</em>.  The penicillin acts by disrupting the formation of the cell wall and thus prevents the growth of the bacteria.

The discovery of penicillin was accidental when he was studying the petridish of staphylococcus and he found that due to avoidance while the experiment, molds grew in the petridish.  The area around the mold was clear and clear rings without the bacteria were easily observed. This lead to the discovery of the penicillin compound.

Thus, Option-A is the correct answer.

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Kitty [74]

The chromosomes are separated by a structure called the mitotic spindle.

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3 0
1 year ago
Why do scientists refer to charles darwin’s ideas about evolution as the theory of evolution?
bearhunter [10]
<span>Charles Darwin theory is theory of biological </span>evolution, that explains how modern organisms evolved over long periods of time through descent from common ancestors. Evolution is the process of change over time and Darwin explains in his theory the changes in humans over time and <span>shows how the living world is constantly changing.</span> This is the reason why cientists refer to charles darwin’s ideas about evolution as the theory of evolution.
8 0
3 years ago
Certain species of insects introduced accidentally in a forest are destroying all the Douglas fir trees in that forest. The wood
grandymaker [24]
Invasive firestorm method.  All pests are now dead with the added benefit of fewer trees to infest.
4 0
3 years ago
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What organs develop in the embryo during the 1st month of pregnancy?
balu736 [363]

Answer:

thus buds that eventually grow into arms and legs are formed in 1st month of pregnancy

7 0
3 years ago
This is the force of attraction between an object and the earth due to gravity.
weeeeeb [17]

Answer:

Gravitational force

Explanation:

Gravitational force is the force that attracts an object down to the earth. It’s also the reason why we don’t float on this planet. This force is also why anything that isn’t thrown up must come down.

In space and other planets with little or no gravitational force ,organisms float over there which makes its inhabitation by organisms very difficult.

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3 years ago
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