OCR Biology A Biological Diversity Unofficial Mark Scheme

1) Membranes - Does not provide support

2)Amylopectin - 1-4/1-6 glycosidic bonds between alpha glucose

3)Photograph - B (Once with no monocytes)

4)Meiosis question - 512

5)DNA replication - 2 and 3

6)Species Eveness - relative abundance of each species in an area

7)Pioneer community question - A

8)Closed Growth Curve - B

9)Agar Jelly Prac - D (Sphere)

10)Primary Defence - Inflammation

11) Plasma Membrane- D only the glycoprotein

12)Something about gene therapy

13)Body Plan - apoptosis and mitosis (B)

14) Plant infection- A

15) Taxidea taxus

Why capture/recapture
UNSURE - maybe to do with the scarce population density and difficulty of capture

Question about supporting the suggestion of 5 jags per 100Km2
came out at rounded down to 3 so it wasn't very supportive

One disadvantage of

Human Sightings - uneducated
Footprints - Physiologically similar organisms

Why is it conservation not preservation
Preservation is leaving it without human intervention, conservation involves intervention give some evidence

Sweet pea YyRr and yyrr cross

Chi squared 8.7ish

at 95% certainty we would reject null hypothesis.

Why might it not be the expected ratio
Autosomal linkage may lead to alleles inherited together reducing to 1:2:1

6 marker describe transcription/translation and why the mutation would change it

Recessive because the presence of one dominant allele will still produce the working enzyme

Potato plant response
Callose/apoptosis/senescence/necrosis/oxidative bursts

Why is it important to use clones
genetically identical no variance increase validity

How would the plants be cloned
Micropropagation
To keep the already sterile plants disease free and to ensure the only infection is from the bacteria being studied

Area under curve
850 odd

Proportion
1:0.7

Why use area under curve
More representative?

Two more abiotic factors
Light intensity
Soil pH

Differences between the hands
Thumb shorter fingers longer

Rate of DNA change
0.17%per million years

Time since divergence question
WASNT SURE

6 marker
Genetic evidence cytochrome C
Phylogenetic evidence/common ancestors
Use loads of figures

Homeobox Gene
Nothing could be concluded as they are highly conserved amongst all animals.

Galactose respiratory sub
Small fit in cells, enter the glycolytic pathway can be reduced to pyruvate

Lactose question
Cant enter because it is too large/polar so needs specific protein channels

E.coli in young mammals
Young mammals have high milk diet/ switch on lac operon to produce lactose permease more channels

Colorimeter
Distilled water
Known concs/callibration curve
Comare unknowns percentage absorbtion

At C
Production of recombinant plasmid annealing DNA ligase

D
Selection pressured DNA propes/microarrays

mRNA
Reverse transcriptase to produce cDNA

Ethical concerns
May speed natural selection/produce resistant strains

Lactose/Maltose
similar glycosidic bonds/ both contain hexose sugars

Differences

Anti parrallel
Alpha/Beta Glucose
1-4 glycosidic / 1-6 glycosidic

OCR Biology A Biological Diversity Unofficial Mark Scheme

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