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Zorluk: KolayDetermining Stated Sequence of Events

Read the following passage:

In 1928, biologist Alexander Fleming discovered penicillin in his London laboratory. Before leaving for a summer vacation in August, he stacked his staphylococcus culture plates on a bench in the corner of his room. Upon returning to the laboratory in September, he noticed that one of the culture plates was contaminated with mold. He subsequently spent the following years attempting to isolate the active substance, but it was not until 1940 that scientists Howard Florey and Ernst Chain successfully purified penicillin for medical application.

Based on the passage, which of the following events occurred first chronologically?

  1. Fleming stacked his culture plates on a laboratory bench.Cevap
  2. B
    Fleming noticed mold contamination on one of his culture plates.
  3. C
    Fleming spent years attempting to isolate the active substance.
  4. D
    Florey and Chain purified penicillin for medical application.

Cevap

Fleming stacked his culture plates on a laboratory bench.
The passage explicitly states that Fleming stacked his culture plates on the bench before leaving for vacation in August. All other listed events occurred upon his return in September, in the years following his return, or in 1940.

Adım Adım Çözüm

1
Identify temporal indicators in the passage.
The text mentions August (before vacation), September (return from vacation), the years immediately following (attempts to isolate), and 1940 (purification).
Tracking time markers allows for accurate chronological ordering of stated events.
2
Locate the specific statement regarding stacking the plates.
The passage explicitly states that 'Before leaving for a summer vacation in August, he stacked his staphylococcus culture plates'.
This establishes that stacking the plates occurred prior to leaving for vacation in August.
3
Compare the placement of all options along the passage timeline.
Stacking the plates occurred in August before vacation, returning and noticing mold occurred in September, isolating attempts occurred over the following years, and purification occurred in 1940.
Determining the earliest timestamp confirms the first chronological event.

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Determining Stated Sequence of Events
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Determining Stated Sequence of Events

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