AQA AS BIO Unit 2 OLD SPEC RESIT Tue 7th June (pm) 2016

what was the answer for explaining advantage of the graph where the blood flow decreased during exercise

Did the question say how many bases in a haemoglobin or something else?

it should be;
first row: Only the first box because it had homologous chromosomes lining up in the centre
second row: Last two because they had only a single chromosme attached to each spindle fibre and not pairs
hope it makes sense

please stop paying aqa

Hi do you no if we can still resit As modules for science? Thanks


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the one about insects....

Spricalses open, oxygen diffuses in down conc gradient to the tracheoles where oxygen diffuses into cells for respiration?

I said that there is a steep conc gradient because oxygen is being used up repsiring tissues.

1.
Phylogenetic group: Groups based on evolutionary history/relationships
Species: a group of similar organisms able to reproduce to produce fertile offspring
Phylum, Order, Genus, Species (the boxes that were not filled - I think these were it?)
Circle question: missing answer
Nucleotide sequence: Two species (can't remember names of the tigers) have the same nucleotide sequence for part of a gene so they are more closely related species. The other species has a different nucleotide sequence for part of a gene so it is less closely related to the other two species.


I can't remember the order of questions but:

Quaternary (structure)
432 DNA bases
56(%)
Person with anaemia has haemoglobin with a lower affinity for oxygen at a higher pO2
So haemoglobin readily unloads from oxygen at the respiring tissues for more respiration
Genetic diversity: the total number of different alleles in a population (the variation in alleles)
Species diversity: the total number of organisms of each species and the total number of organisms of all species (within a community)
Measurements needed: (total) number of organisms of each species and total number of organisms of all species
Spiracles
Trachea

I put tracheoles because it said directly to and from the cells


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As it was asking about the movement of air (I think), I just put air enters into tracheal system through spiracles and into the tranchae and then tracheoles which go directly into the cells. Oxygen diffuses into respiring cells down the oxygen concentration gradient. It can diffuse out as trachioles are thin and permeable to gases like oxygen and CO2.

What do you think?

I did two circles, one genus one species

Then labelled genus one with their names (e.g Tiger - genus name clouded leopard - genus name) and same for species

Is this right?

Ignore me so did I

Minimum number of bases to make up 1 alpha polypeptide chain in haemoglobin


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Said: Blood leaves kidney via renal vein.
Joins vena Cava.

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Exactly what I did, only that I didn't put 'genus' and 'species' down but just their genus and species names respectively.

I thought you put John Cena haha

Exactly what I did, only that I didn't put 'genus' and 'species' down but just their genus and species names respectively.