2015 pastpaper 2

Question 1

State how many chromosomes will be present in each off the two cells produced by the process

Answer 1

if there are 4 chromosomes in the begining cell then there will still be four in the other cells

Question 2

Name a site of mitosis in plants

Answer 2

Root tip

Question 3

Dna contains genetic material which controls the synthesis of chemicals made from amino acids. Name the type of chemicals synthesised

Answer 3

Proteins

Question 4

Describe how molecule p determines the sequence of amino acids

Answer 4

Mrna
The order of bases determines the order of amino acids

Question 5

Name the energy producing process which starts in the cytoplasm and is completed in the mitochondria

Answer 5

Aerobic respiration

Question 6

Describe how information is passed along a neuron

Answer 6

Electrical impulse

Question 7

Differance between genotype and phenotype

Answer 7

genotype- letters
phenotype- them

Question 8

Most features of an individuals phenotype are controlled by more than one gene name this type of inheritance

Answer 8

Polygenic

Question 9

Describe the structures and process involved as water moves through the plant from the soil to the air

Answer 9

Water moves is
absorbed by root hairs by
osmosis/diffusion (1)
(Water) travels upwards in the
xylem (1)
(water) travels to the stomata
/pores and evaporates/transpires
/diffuses out

Question 10

mucus and cilia are found in the trachea
Describe how the mucus and cilia work together to help prevent bacteria getting into the lungs

Answer 10

Dirt is trapped in the mucus. Cilia move these up and away from the lungs

Question 11

Mutations are the only source of new alleles. Explain why its important that new alleles arise in a species

Answer 11

(Allows the species) to
evolve/adapt
 in response to changing
environmental conditions