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3 years ago

What do your call a question that can be Answered through a investigation

1 answer:

7 0

Answer: A scientific question can be answered through an investigation. What is tested? Scientists call this an independent variable.

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A spheroidal bacterium with a diameter of 1 mm contains 2 molecules of a particular protein. What is the molar concentration?

creativ13 [48]

Answer : The molar concentration is, $6.35\times 10^{-18}mol/L$

Explanation :

First we have to calculate the moles of protein.

$\text{Moles of protein}=\frac{\text{Number of molecules of protein}}{\text{Avogadro's number}}$

Number of molecules of protein = 2 molecules

Avogadro's number = $6.022\times 10^{23}molecules/mol$

$\text{Moles of protein}=\frac{2\text{ molecules}}{6.022\times 10^{23}molecules/mol}=3.32\times 10^{-24}mol$

Now we have to calculate the radius.

Radius = $\frac{Diameter}{2}=\frac{1mm}{2}=0.5mm=5.0\times 10^{-4}m$

Conversion used : (1 mm = 0.001 m)

Now we have to calculate the volume.

$V=\frac{4}{3}\pi r^3$

$V=\frac{4}{3}\times 3.14\times (5.0\times 10^{-4}m)^3$

$V=5.23\times 10^{-10}m^3=5.23\times 10^{-7}L$

Conversion used : (1 m³ = 1000 L)

Now we have to calculate the molar concentration.

$Concentration=\frac{\text{Moles of protein}}{\text{Volume}}$

$Concentration=\frac{3.32\times 10^{-24}mol}{5.23\times 10^{-7}L}$

$Concentration=6.35\times 10^{-18}mol/L$

Thus, the molar concentration is, $6.35\times 10^{-18}mol/L$

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3 years ago

Antibiotic prophylaxis is prescribed for a 2-year-old child with a cardiac malformation who is awaiting corrective surgery. the

Andreas93 [3]

The nurse should explain that during surgery, an antibiotic prophylaxis is administered to prevent the incidence of surgical site infection. The use of antibiotic before the procedure is just one of many actions taken to help reduce the rate of wound infections. Furthermore, the initial dose must be given most likely within 30 minutes before incision. Then, the next dose is at one to two half-lives of the antibiotic, which is recommended for the duration of the surgery. Thus, appropriate timing of dose is essential to the effectiveness of the antibiotic.

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4 years ago

The brain injury suffered by 19th-century railroad worker phineas gage allowed psychologists to learn about the functions of the

monitta

The brain injury suffered by Phineas allowed psychologists to learn about the functions of the brain's FRONTAL LOBE.
The man case was the first one in which a brain damage will result into a change in personality. The damage to the Phineas frontal lobe helped scientists to recognize the connection between the frontal lobe of the brain and social cognition and decision making.<span />

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3 years ago

As much as 25 percent of the fruits and vegetables grown in Chinese agricultural regions rot before they can be transported the

irinina [24]

I think it is a I hope this help you

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3 years ago

Which is NOT a characteristic of bacteria? They are unicellular. They are prokaryotic. They are the smallest form of life on ear

Inessa05 [86]

"They are <span>multicellular" is not a characteristic of bacteria. Although it should be noted that the smallest life forms don't necessarily have to be bacterial. </span>

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3 years ago