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ANTONII [103]
3 years ago
5

Anna has been studying a type of bacteria that triples every month. Originally, there were 4 bacterial cells. She wants to know

how many there will be after 15 months. Which equation should she use?. . a15 = 4(3)(15). . a15 = 4(3)15. . a15 = 4(3)15 − 1. . a15 = 4(3)(15 − 1). @perl . @DarkBlueChocobo
Biology
2 answers:
Mnenie [13.5K]3 years ago
4 0

Answer:

Option A

Explanation:

The initial number of bacteria's is equal to 4

This number get tripled every month which means after one month  the number of bacteria's will be 4 * 3

After two months the number of bacteria's will be (4 * 3)*3

After three months the number of bacteria's will be ((4 * 3)*3)*3

i,e after three months total number of bacteria's is equal to = 4* (3)^3

Thus, after three months total number of bacteria's is equal to = 4* (3)^15

Hence, option A is correct

kvv77 [185]3 years ago
3 0

Answer:

a(15)=4(3)^{15}

Explanation:

Given,

Original number of bacterial cell = 4,

Also, the number of bacterial cell triples every month,

So, the number of bacteria after one month = 3 × 4 = 4(3)

After two months = 3 × 4(3) = 4(3)²,

After three months = 3 × 4(3)² = 4(3)³,

......................................................... , so on,

Thus, the number of bacterial cell after 15 months,

a(x)=4(3)^x

For 15 months, x = 15,

Hence, the number of bacterial cells after 15 months,

a(15)=4(3)^{15}

Which is the required equation she should use.

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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.

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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.

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