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snow_lady [41]
3 years ago
14

Explain whether nuclear or mitochondrial DNA is better for identifying a specific person

Chemistry
1 answer:
hodyreva [135]3 years ago
7 0

Answer:-

Nuclear DNA is inherited from all ancestors. But mitochondrial DNA is inherited from a single lineage. The DNA inside of mitochondria (called mtDNA) unlike DNA inside the nucleus, comes from only mothers.

It is not a mixture of our parent’s DNA, and each person’s mtDNA is nearly identical to his or her mother’s mtDNA.

Thus only nDNA being more unique is more useful for identifying in forensics. In cases where nDNA is not sufficient, mtDNA is used.

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How many particles are in a 151 g sample of Li2O?
neonofarm [45]

Answer:

3.052 × 10^24 particles

Explanation:

To get the number of particles (nA) in a substance, we multiply the number of moles of the substance by Avogadro's number (6.02 × 10^23)

The mass of Li2O given in this question is as follows: 151grams.

To convert this mass value to moles, we use;

moles = mass/molar mass

Molar mass of Li2O = 6.9(2) + 16

= 13.8 + 16

= 29.8g/mol

Mole = 151/29.8g

mole = 5.07moles

number of particles (nA) of Li2O = 5.07 × 6.02 × 10^23

= 30.52 × 10^23

= 3.052 × 10^24 particles.

4 0
3 years ago
What is the molar mass of Pb(Cr2O7)2
bagirrra123 [75]

Answer:

The molar mass of Pb(Cr2O7)2 is 639.2 g/mol.

6 0
2 years ago
Read 2 more answers
Identify two ways that temperature plays a role in chemical changes.
sergejj [24]

Answer:

Increasing the temperature will cause chemical changes to occur faster. Decreasing the temperature, causes the particles to lose energy which causes them to move around less and slower. The less they move, the less collisions occur, and the less reactions occur between the chemicals = slower reaction rate.

Explanation:

3 0
3 years ago
Carbon can react with oxygen to form carbon dioxide. Which of the following statements about this chemical change is true?
wlad13 [49]

Carbon can react with oxygen to form carbon dioxide. Which of the following statements about this chemical change is true? ... Carbon and oxygen atoms are destroyed as new atoms are formed. Carbon and oxygen atoms have the same properties as molecules of carbon dioxide.

6 0
3 years ago
A car travels at 35.0 mi/hr. How far has it gone in 2455 seconds?
Vika [28.1K]

Answer:

<h3>The answer is 23.8 miles</h3>

Explanation:

The distance covered by an object given it's velocity and time taken can be found by using the formula

<h3>distance = velocity × time</h3>

From the question

velocity = 35.0 mi/hr

time = 2455 s = 0.68 hr

We have

distance = 35 × 0.68

We have the final answer as

<h3>23.8 miles</h3>

Hope this helps you

5 0
3 years ago
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