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Lapatulllka [165]
3 years ago
6

Oil immersion is used because it increases: A. Resolution B. Contrast C. Refracted Light D. The working distance between the len

s and the specimen
Biology
1 answer:
Korvikt [17]3 years ago
5 0

Answer:

A. Resolution is the correct answer.

Explanation:

Oil immersion is used to increase the numerical aperture and resolution power of the microscope.

Oil such as cedarwood, paraffin oil which has a high refractive index is used and placed between a slipcover and an objective lens that increases the resolving power. This completely immerses the light way among the lens and object observed and allowing more precise features to be observed.

Oil immersion is required for observing unique bacteria and parts of the striations muscle.

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Fraternal twins are no more similar genetically than any other sibling pair.
Elena-2011 [213]
The answer to this question would be: True

Fraternal twins are made from 2 different eggs and fertilized by two different sperm. That makes them just like 2 siblings since the genetic in their egg and sperm is different, not same. This can happen if there is two egg released by the womb at the same time.
6 0
3 years ago
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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Answer:

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Explanation:

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Freekeh is termed as a cereal food which is made from green durum wheat. It is being rubbed and roasted to create flavor. Freekeh is an ancient dish which is derived from North Africa cuisines and Levantine.
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Which best describes a likely result for the excretory system if the kidneys are weakened?
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