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Over [174]
3 years ago
5

A small plastic bag is filled with a mixture of sugar and water. The bag is tied tightly and placed in a beaker of 100% water an

d locked in a cabinet. After two days, the water outside the bag is tested and the tests indicate there is sugar in the water outside the bag. What best explains this test result?
A.Sugar moved from an area of low concentration inside the bag to a higher concentration outside of the bag.
B.The plastic bag was selectively permeable and would not allow the sugar molecules to enter or leave.
C.The pores (holes) in the bag were large enough to let the sugar pass and passive transport occurred.
D.Sugar from the air moved into the water over time.
Biology
1 answer:
tigry1 [53]3 years ago
8 0
The answer is C because the sugar went from an area of high concentration to an area of low concentration.
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3 years ago
Fresh raspberry contains 80% water. dried raspberry contains only 20% water. what weight of dried raspberry can you get from 36
adell [148]

There 2 ways to solve this

1-      Directly :

80% of water in the fresh berries è 20% of water in the dried berries

36 Ibs of the fresh berries è X Ibs of the dried berries

X = \frac{36 * 20}{80}<span> = 9 Ibs</span>

 

<span>2-      </span>If you do not understand the first method, the second one is more explicit:

First, we gonna calculate the weight of the berries without water (dehydrated):

<span>36 * 80% = 28.8 Ibs    (of water in the berries)</span>

Then:

<span>36 – 28.8 = 7.2 Ibs (of completely dehydrated berries)</span>

 

Next, we gonna add 20% of water in the dehydrated berries:

X (total weight of dried berries) è 100%

7.2 Ibs of dehydrated berries è 80%

X = <span>  </span>\frac{7.2 * 100}{80}   = 9 Ibs

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The most common use of bioremediation has been to assist in the cleanup of ________. the most common use of bioremediation has b
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The correct answer is <span>oil spills.

Bioremeditation is best described as </span><span>a </span>process<span> used to </span>react with different sources, such as contaminated<span> media, </span>inclusive of<span> water, soil and subsurface </span>cloth<span>, through the </span>changing<span> environmental </span>conditions<span> to stimulate </span>growth<span> of microorganisms and degrade the </span>targeted pollutants, in lots of cases<span>, bioremediation is </span>much less highly-priced<span> and </span>greater<span> sustainable than </span>different<span> remediation </span>alternatives<span>. O</span>rganic remedy<span> is a </span>comparable method <span>used to </span>treat<span> wastes </span>consisting of<span> wastewater, </span>industrial<span> waste and </span>solid<span> waste.</span>
7 0
3 years ago
You spread 0.1 mL volume of a 10^(-5) dilution onto a nutrient agar plate. After 24 hours of incubation at 37°C, there were 223
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Answer:

The correct answers are 2.23 * 10^8 CFU/ml and 2 colonies.

Explanation:

Based on the given information, 0.1 ml is the amount of bacterial culture plated, 10^-5 is the dilution factor and the number of bacterial colonies produced is 223.  

A) 223 is the number of colonies produced when 0.1 ml of the culture is plated. Therefore, the number of colonies produced when 1 milliliter of bacterial culture plated us (223/0.1)*1 = 2230

The calculation of the CFU/ml is done by using the formula,  

CFU/ml = Number of colonies per ml plated / dilution factor

Thus, 2230/10^-5

= 2230 * 10^5 or 2.23 * 10^8 CFU/ml

B) The number of colonies, which would grow on a plate, which is inoculated with 0.1 ml volume of 10^-7 dilution from the similar bacterial stock will be calculated as,  

CFU/ml = Number of colonies per ml plated/ dilution * volume plated.  

2.23 * 10^8 CFU/ml = Number of colonies per ml plated / 10^-7 * 0.1

Number of colonies per ml plated = 2.23 * 10^8 * 0.1 / 10^7 = 2.23 or 2 colonies.  

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Gene transfer to nontarget species
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