QUESTION 1 Why was salt added to the DNA mixture? Saltwater extracts DNA faster

Question

QUESTION 1

Why was salt added to the DNA mixture?

Saltwater extracts DNA faster than tap water.

Helps to break open the cell.

Sodium cation and chloride anion will form an ionic compound with the other components of the cell.

The salt wasnt really necessary.

1 points   

QUESTION 2

What was the purpose of adding the shampoo?

Make sure that your glass was clean.

Need to mask the odor of the DNA.

Help to dissolve the cell membrane.

Again, the shampoo wasnt really necessary.

1 points   

QUESTION 3

Why was it important that the shampoo you used contained EDTA?

EDTA was needed to bind with the Mg2+ ions that are needed by the enzymes that degrade DNA.

To discombobulate lipid layers.

To partially denature chromosomal proteins.

Forces the other components of the cell to precipitate out of solution.

1 points   

QUESTION 4

What was the purpose of adding the meat tenderizer?

Changes the polarity of the water.

Forces the other components of the cell to remain soluble in water.

Controls the pH of the mixture.

Destroys the proteins that hold the DNA tightly coiled inside the cell.

1 points   

QUESTION 5

What was the purpose adding cold alcohol?

To force the DNA to precipitate out of solution.

Makes the mixture more polar.

To get rid of any extra meat tenderizer.

To denature any unwanted proteins.

1 points   

QUESTION 6

What does the acronym DNA stand for?

Dinitrogen amine

Double nucleic acid

Dinitro acetaldehyde

Deoxyribonucleic acid

1 points   

QUESTION 7

How many different bases are used in DNA?

2

3

4

5

1 points   

QUESTION 8

What other chemical fragments are components of DNA?

phosphate group and ribose

deoxyribose and sulfate group

phosphate group and deoxyribose

sulfate group and ribose

1 points   

QUESTION 9

Which of the following bases is not a component of DNA?

Cytosine

Uracil

Adenine

Guanine

1 points   

QUESTION 10

Which base will always pair up with Thymine?

Cytosine

Uracil

Adenine

Saltwater extracts DNA faster than tap water.

Helps to break open the cell.

Sodium cation and chloride anion will form an ionic compound with the other components of the cell.

The salt wasnt really necessary.

Explanation / Answer

Question 1: (a). The salt added helps the DNA to precipitate (as it clumps together) when it meets the ethanol phase. So, Saltwater extracts DNA faster than tap water.

Question 2: (C). After the cell walls have been disrupted during mechanical mashing of the fruit, the detergent in the shampoo disrupts the cell and nuclear membranes of each cell to release the DNA. It does this by dissolving lipids and proteins that hold the membranes together. So, the purpose of adding the shampoo is to help to dissolve the cell membrane.

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