Leaving Cert Biology Genetics, DNA & Evolution: 9.
(a) (i) Give any one base pa

Question

9. 
(a) (i) Give any one base pair found in DNA.

(ii) Mutations are changes in DNA or chromosomes. State one cause of mutation.

(b) Answer the following in relation to practical work you carried out to isolate DNA from plant tissue.

(i) Name a suitable plant for this activity.

(ii) Below is a list of some of the steps carried out during the practical work but they are not in the correct order.

A. Pour freezer-cold ethanol down the inside of the test tube containing the filtered plant extract. 
B. Add the mixture of the plant tissue, salt and washing up liquid to a blender. 
C. Chop the plant tissue into small pieces. 
D. Add 2 – 3 drops of protease to the filtered plant extract.

Indicate below, using the letters A, B, C and D, the correct order of the above steps.

Step 1

Step 2

Step 3

Step 4

(iii) Why was the protease added to the filtered plant extract?

(iv) What was the purpose of adding washing up liquid to the mixture?

(v) What was the purpose of the freezer-cold ethanol?

9. (a) (i) Give any one base pair found in DNA - Leaving Cert Biology - Question 9 - 2015

Worked Solution & Example Answer:9. (a) (i) Give any one base pair found in DNA - Leaving Cert Biology - Question 9 - 2015

Give any one base pair found in DNA.

State one cause of mutation.

Name a suitable plant for this activity.

Indicate below, using the letters A, B, C and D, the correct order of the above steps.

Why was the protease added to the filtered plant extract?

What was the purpose of adding washing up liquid to the mixture?

What was the purpose of the freezer-cold ethanol?

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