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Lerok [7]
3 years ago
5

The most common compounds in organic sediments are *

Biology
1 answer:
AveGali [126]3 years ago
3 0

Answer:

A nationwide effort measured trace organic compounds (N = 33) in water and sediment of 42 lotic ecosystems across the US. The most common compounds were caffeine, carbamazepine, cotinine, sucralose, sulfamethoxazole, triclosan, and venlafaxine.

Explanation:

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A bacterial sample has a cell density of 1.85 x106 CFU/mL. What plate dilution should yield a countable plate? Which two dilutio
insens350 [35]

Answer:

Explanation:

Bacterial count in stock- 1.85x10^6 cfu/ml

Dilution methods

Take 100 uL or (0.1ml) from stock and add to 900ul (0.9ml) saline and mixed it- this makes 10^1dilution.

Now take 100ul from 10^1 dilution and add to next 900ul saline this is 10^2 dilution, similarly do upto 10^5 dilution.

Then take 100ul from 10^ 4 and 10^5 dilution seperately and plate on LB agar plate seperetely and count the colonies.

Cfu/ml formula= (No.of colonies x dilution factor)/0.1 ml

So suppose, 18 colonies formed on 10^4 dilution then total no. Of cells in stock will be 18x10^4/ 0.1= 18x10^5 cfu/ml.

If we dilute 10^4 or 10^5 that's leads to colony count of 18-19 colonies on 10^4 dilution while 2 colonies should come on plate of 10^5 dilution.

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3 years ago
Wait what’s the answer
valkas [14]
What is the question so we can help
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In the development of a cancer cell, the formation of new blood vessels is called
pantera1 [17]
In the development of a cancer cell, the formation of new blood vessels is called Angiogenesis, option B. When tumors are present in the body, circulation and the distribution of nutrients in the body is altered; thus, resulting in different kinds of disorders associated with cancer. With the presence of cancer, these tumors need more nutrients to spread and grow, which results in the formation of more blood vessels.
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Which geological era is known as the age of reptiles? A. Cenozoic B. Mesozoic C. Paleozoic D. Precambrian
I am Lyosha [343]
The answer is B, the Mesozoic era
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The nitrogenous bases guanine and adenine are
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Guanine and adenine, structure-wise, are purines.
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