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

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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 relat... show full transcript

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

Step 1

Give any one base pair found in DNA.

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Answer

A base pair found in DNA is Adenine (A) which pairs with Thymine (T).

Step 2

State one cause of mutation.

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Answer

One cause of mutation can be exposure to radiation or chemicals, such as cigarette smoke.

Step 3

Name a suitable plant for this activity.

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Answer

A suitable plant for this activity is an onion.

Step 4

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

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Answer

Step 1: C Step 2: B Step 3: D Step 4: A

Step 5

Why was the protease added to the filtered plant extract?

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Answer

The protease was added to break down protein, aiding in the isolation of DNA from the chromosomes.

Step 6

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

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Answer

The washing up liquid serves to break down cell membranes, facilitating the release of DNA.

Step 7

What was the purpose of the freezer-cold ethanol?

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Answer

The freezer-cold ethanol is used to bring DNA out of solution, allowing it to be seen more clearly.

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