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KiRa [710]
3 years ago
13

Diffusion of water across a selectively permeable membrane is called

Biology
1 answer:
Sedaia [141]3 years ago
3 0

Answer:

osmosis

Explanation:

it is because osmosis is the movement of water molecules from a lower concentrated region to a higher concentrated region through a semi permeable membrane

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Which renewable resource supplies more electricity to the human population than any other single renewable resource?
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Hydropower is the renewable resource that supplies which is more electricity to the human population than any other single of renewable resource

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7 0
2 years ago
A grad student has a culture of E. coli with a total volume of 1,800 mL, and OD reading at 550 nm of 1.7. He transfers 1 mL cult
Naily [24]

Answer:

Explanation:

We'll represent the dilution as the volume transferred/total volume in the tube after transfer. So for the first dilution, 1 ml of culture was added into 9ml of broth bringing the total volume to 10 ml i.e 1/10

For the second dilution, 0.1 mL was added to 0.9mL of broth bringing the total volume to 1mL i.e 0.1/1.0 (this is also the same as 1/10). In relation to the stock culture, this is represented as 1/100 (that is 1/10 (first dilution) * 1/10 (second dilution)

Giving that the same was done for dilution 3 and 4,

third dilution is represented as: 1/10 and the fourth as 1/10 as well

In relation to the stock, dilution 3 is 1/1000

dilution 4 is 1/10000

a. the dilution in the third tube is \frac{1}{1000} = 10^{3 or 1.0*10^{3}

b. the dilution spread onto the agar plate is the fourth dilution, that is, \frac{1}{10000} = 10^{4} or 1.0*10^{4}

c. Since the grad student got 386CFU/0.2mL (200 uL = 0.2mL),

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the cells in 1800mL is therefore 1930*1800 = 3,474,000 = 3.4*1010^{6}

3 0
3 years ago
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