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3 years ago

The presence of polar ice and water eroded canyons provide evidence for liquid water in the Martian past.

Biology

1 answer:

Black_prince [1.1K]3 years ago

7 0

True

You welcome, have a good day :)

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2. Any organism that has a true nucleus is in the domain:

Digiron [165]

eukaryotic I believe because they are the cells that have a nucleus enclosed within membranes.

8 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, $6.35\times 10^{-18}mol/L$

4 0

3 years ago

Which of the following is a device for measuring the height of a tree?

rewona [7]

Answer:

The answer is C basal area

6 0

2 years ago

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HELP ASAP!!! i started looking them up but it was so cunfusing!!!!!

slavikrds [6]

Answer:

1.phototropism

2.geotropism

3.tropism

4.biome

5.symbiosis

6.cortex

Explanation:

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2 years ago

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What is the role of dna fingerpringing in criminal investigations?

elena-s [515]

DNA Fingerprinting is a way to find a specific individual. It is more specific than simply identifying a specie or a particular trait. It is a sort of personal identifier. DNA uses micro satellite to make to make identification much easier. DNA fingerprinting is prevalent in the world of criminal forensic.

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3 years ago