BIOLOGY HIGH SCHOOL

A 1 ml sample of culture liquid contained 1000 viable bacterial cells. You serially diluted it twice, performing 10-fold or 1/10 dilutions into a final volume of 1 ml each time. As a result you have three tubes with 100, 10-1, or 10-2 of diluted culture. How many total cells are in the 1 ml of your 10-2 dilution tube?

Answers

Answer 1
Answer:

Answer:

there are 10 viable bacterial cells in 1 ml in the 1/100 dilution tube

Explanation:

in 1ml there is 1000 viable bacterial cells → diluted with 9 ml of solvent (10 ml in total)→  1000 viable bacterial cells in 10 ml (fist tube)

now we take 1 ml of the first tube into the second empty tube → has 1000/10 = 100 viable bacterial cells on 1 ml → diluted with 9 ml of solvent (10 ml in total)→  100 viable bacterial cells in 10 ml (second tube)

then we take 1 ml of the second tube into the third empty tube → has 100/10 = 10 viable bacterial cells in 1 ml → diluted with 9 ml of solvent (10 ml in total)→  10 viable bacterial cells in 10 ml (third  tube)

therefore there are 10 viable bacterial cells in 1 ml in the 1/100 dilution tube


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The phosphorus cycle differs from the biogeochemical cycles in that?

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It doesn't produce gas

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The production of its gas only occur in specialized conditions
HIGH SCHOOL

When you place your hand on a hot stove you remove it after a period of time. Then when you are given some morphine, you place your hand on the hot stove and leave it on the stove longer than before. A tone is then given, you are given the morphine and place your hand on the stove. What will occur

Answers

Answer:

The correct answer is - person will remove hand faster.

Explanation:

The tone is neutral stimulus that is not cause any response naturally. It was used as the sound of bell in Pavlov experiments. Unconditioned stimulus and a prior neutral stimulus together form a tone that is an association of the both.

It initiates the response that was were caused by the beginning of the stimulus and tone become the conditioned stimulus. In this case tone cause the initial response. In this event individual will remove his hand faster.

Thus, the correct answer is - person will remove hand faster.

HIGH SCHOOL

The specialization of a certain cell or groups of cells for a specific function is called _____?

Answers

The answer is tissue
 either organ, or organelle but then again it could be tissue  do you have answer choices ? that would be helpfull
MIDDLE SCHOOL

You look out over a field of sunflowers. A farmer has grown the sunflowers to harvest and sell the seeds. Some of the sunflowers are tall; some short. Some of the flowers are bright yellow; others more multicolored. Some heads are full of seeds; some are not full. How were these sunflowers most likely produced?

A) sexually using seeds
D) sexually using tissue culture in the lab

Answers

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