ppq energy + photosynthesis

Question 1

explain why value for GPP is lower than the light energy available to ecosystem

Answer 1

not all light falls on leaves
some light is reflected from surface of leaf
some light passes through leaf
some light is wrong wavelength so not absorbed by chloroplasts

Question 2

why is forensic entemology best method of determining time of death after 72 hours

Answer 2

rigor mortis only lasts for 24h
body temperature is only helpful for 24 hours
FE can show succession- use known life cycles to determine how long they have been on the body for

Question 3

describe changes that take place i body 24 h after death

Answer 3

body temp falls
rigor mortis occurs
cells broken down in the body
discolouration/ bloating

Question 4

how do primers work in GE

Answer 4

primers have specific dna base sequence
bind to complementary bases at either end of DNA to be amplified
provide a site for DNA polymerase to bind