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Artyom0805 [142]
3 years ago
15

A scientist uses materials in her lab to cut a DNA sample into fragments.

Chemistry
2 answers:
Mumz [18]3 years ago
5 0
The scientist is using gel electrophoresis. Gel electrophoresis is a process used to cut DNA into fragments in order to see them.
weqwewe [10]3 years ago
4 0

Answer:use of restriction enzymes

Explanation: C. Use of restriction enzymes

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You wish to construct a buffer of pH=7.0. Which of the following weak acids (w/ corresponding conjugate base) would you select?
Alex17521 [72]

Answer:

C.) HOCl Ka=3.5x10^-8

Explanation:

In order to a construct a buffer of pH= 7.0 we need to find the pKa values of all the acids given below

we Know that

pKa= -log(Ka)

therefore

A) pKa of  HClO2 = -log(1.2 x 10^-2)

=1.9208

B) similarly PKa of HF= -log(7.2 x 1 0^-4)= 2.7644

C)  pKa of HOCl= -log(3.5 x 1 0^-8)= 7.45

D) pKa of HCN = -log(4 x 1 0^-10)=  9.3979

If we consider the  Henderson- Hasselbalch equation for the calculation of the pH of the buffer solution

The weak acid for making the buffer must have a pKa value near to the desired pH of the weak acid.

So, near to value, pH=7.0. , the only option is HOCl whose pKa value is 7.45.

Hence, HOCl will be chosen for buffer construction.

3 0
3 years ago
What is 1 item that is a compound?<br><br>Give an example of how the 1 item is a compound :D
spayn [35]

Water

Water is a compound because it is made from more than one kind of element (oxygen and hydrogen).

3 0
3 years ago
If a plane travels at a speed of 600 km/h, how long<br> would it take to travel a distance of 300 km
iogann1982 [59]

Answer:

30 minutes

Explanation:

If the plane is going 600 km/h

divide the length and time and it would be half of that, so 300 km would take 30 mins.

4 0
3 years ago
Read 2 more answers
What happens to an ionic compound when it is dissolved in water?
damaskus [11]

Answer:

c

Explanation:

because the ion are Mobil which mean they are free not combined and carry a charge but when they are combined/ fixed in position they can't carry a charge so therefore can't conduct electricity  :)

8 0
2 years ago
Chemical compounds
V125BC [204]

Answer: can be made up of one atom with several different elements in it (b)

Explanation:

i just got this question on Study Island

7 0
3 years ago
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