key points for bio paper 1

Question 1

bacteria

Answer 1

1. absence of membrane bound organelles such as nuclei or mitochondria
2. unicellular
3. ribosomes are 70S (smaller)
4. cell wall made of murien
5. single loop of naked DNA

Question 2

Eukarya

Answer 2

1. membrane bound organelles
2. larger ribosomes (80S)
   (is divided into 4 kingdoms: protoctist, animal, plants and fungi)

Question 3

species diversity

Answer 3

the number of different species and the number of individuals of each species in any one community

Question 4

genetic diversity

Answer 4

variety of genes possessed by individuals that make up a population of a species

Question 5

ecosystem diversity

Answer 5

refers to the range of different habitats

Question 6

species richness

Answer 6

a measure of species diversity that is the number of different species in a particular area at a given time.
This is an important measure because two communities might have the same number of species but the proportions of the community made up of each species may differ.

Question 7

how to read the species diversity index

Answer 7

the higher the value of d, the greater the species diversity

Question 8

species diversity management techniques for farmers

Answer 8

1. maintaining existing hedgerows
2. planting hedges instead of putting up fences
3. leave wet corners of the field
4. biological control instead of pesticides
5. crop rotation that includes a nitrogen fixing crop instead of using fertilisers

Question 9

polygenic

Answer 9

coded for by one gene