Topic SB4 Hw

Question 1

What are the features of archea?

Answer 1

Cells with no nucleus and genes contain unused sections of DNA

Question 2

What are the features of bacteria?

Answer 2

Cells with no nucleus and no unused sections in genes

Question 3

What are the features of eukarya?

Answer 3

Cells have a nucleus and there are no unused sections in DNA

Question 4

Give a disadvantage of GM.

Answer 4

Some are concerned that the new genes may transfer to other crops or wild plants by pollination.

Question 5

What is a common ancestor?

Answer 5

When a number of species evolved from the same animal

Question 6

How can a characteristic evolve?

Answer 6

Natural selection

Question 7

What are the steps to natural selection?

Answer 7

Variation, competition, survival of the fittest, reproduction, characteristics passed on the the offspring.

Question 8

In natural selection, which individuals live to pass on characteristics to their offspring?

Answer 8

Those best suited to their surroundings

Question 9

Give one advantage and a disadvantage of a fertiliser.

Answer 9

Adv. they can increase food production

Dis adv. they can pollute lakes and rivers

Question 10

Give one advantage and disadvantage of biological control

Answer 10

Adv. it means pests can be eradicated by an organism eating them
Dis adv. removing this pest could cause knock on issues in the ecosystem