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20 microbial colonies appear on an agar plate having sources and cellulose as the only carbon sources. Of the 20 colonies, microbes in 12 colonies can metabolize source. If microbes in 4 colonies metabolize both source and cellulose, the number of colonies with microbes which can metabolize cellulose is
  • a)
    4
  • b)
    8
  • c)
    12
  • d)
    20
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
20 microbial colonies appear on an agar plate having sources and cellu...
To solve this problem, we need to analyze the information given and determine the number of colonies that can metabolize cellulose.

Given information:
- There are 20 microbial colonies on the agar plate.
- The only carbon sources available are source and cellulose.
- 12 colonies can metabolize source.
- 4 colonies can metabolize both source and cellulose.

To find the number of colonies that can metabolize cellulose, we need to subtract the number of colonies that can only metabolize source from the total number of colonies that can metabolize source.

Let's break down the information step by step:

Total number of colonies = 20

Number of colonies that can metabolize source = 12

Number of colonies that can metabolize both source and cellulose = 4

Number of colonies that can metabolize only cellulose = ?

Number of colonies that can metabolize only source = Number of colonies that can metabolize source - Number of colonies that can metabolize both source and cellulose

Number of colonies that can metabolize only source = 12 - 4 = 8

Now, to find the number of colonies that can metabolize cellulose, we subtract the number of colonies that can metabolize only source from the total number of colonies:

Number of colonies that can metabolize cellulose = Total number of colonies - Number of colonies that can metabolize only source

Number of colonies that can metabolize cellulose = 20 - 8 = 12

Therefore, the correct answer is option (c) 12.
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20 microbial colonies appear on an agar plate having sources and cellulose as the only carbon sources. Of the 20 colonies, microbes in 12 colonies can metabolize source. If microbes in 4 colonies metabolize both source and cellulose, the number of colonies with microbes which can metabolize cellulose isa) 4b) 8c) 12d) 20Correct answer is option 'C'. Can you explain this answer?
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