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Thts wut i thought but the actual answer is B,sweetiepie said:in question 40
the answer is A cox its according to number of individuals just c it
hope it helps
my try:hassam said:please tell anser of how natural selection brings about evolution?
Very Fascinating! Good Answer. i couldn't find anything about it in the revision guide :xmemyself15 said:here is what i found in a book:hassam said:cn somebody explain me how synapse are involved with memory
synapses are involved in memory and learning.despite much research, little is yet known about how memory operates. however, there is much evidence that it involves synapses. For example, if your brain frequently receive information about two things at same time, say a sound of a particular voice and a site of particular face, then it is thought that new synapses form in your brain that links the neurones involved in the passing of information along the particular pathways from your ears and eyes. In future, when you hear the voice, information flowing from your ears along this pathway automatically flows into the other pathway too, so that your brain pictures the face which goes with the voice.
hope that helps!!
Dayyanah said:can anyone pls hepl me with resting potential ans action potential
the cambridge text book doesnt make things too clear for me
thnx in advance
Dayyanah said:@ sweetiepie thanx aloooooot
hassam said:whats the meaning of GENETIC DRIFT
anybody?XPFMember said:Assalamoalaikum!!
In June:2010 Paper:41
Q:8 (b) (i) Outline, with reference to CF, what is meant by gene therapy.
Mark scheme says:
1 alters genotype ;
2 insert, dominant/normal, allele ; R gene
3 into, affected/appropriate, cells ;
4 use of vector/named vector ;
5 ref. recombinant DNA ;
In point 2: why does it say 'R gene'
er says: Common errors included references to gene rather than allele.
But the application booklet says: Since it is a recessive condition, such gene therapy does not need to remove or
replace the existing genes in the person’s cells – adding a working copy of the gene
to a cell and having it expressed would be sufficient to permit that cell to transport
chloride ions normally.
The Cambridge Revision guide also refers to inserting the gene. :%)
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