Top answers

Biology
A Level

How are chloroplasts adapted to their function?

Many grana, large surface area for photosynthetic pigments, electron carriers and ATP synthase enzymes. 

Photosynthetic pigments are arranged into structures called photosystems, allows m...

MA
Answered by Matthew A. • Biology tutor
115318 Views

What is the all or nothing principle?

Basically this means that if the threshold voltage of a neurone is reached -40mV, then a stimulus will be generated of always +40mV. If the threshold is not reached then there will be no signal. 

KD
Answered by Katie D. • Biology tutor
9814 Views

What is speciation?

Speciation is the EVOLUTION of a NEW SPECIES from an EXHISTING SPECIES. 

If two populations are seperated so the flow of alleles stops (e.g geographic isolation- a physical barrier that p...

KD
Answered by Katie D. • Biology tutor
6786 Views

What is sex linkage?

 

Sex linkage is a type of genetic disease, where the gene with the faulty allele is carried on the X chromosome. 

Women have 2X chromosomes whilst men only have 1. Conseque...

KD
Answered by Katie D. • Biology tutor
10461 Views

What is the difference between passive and active immunity?

Active immunity is happens due to the contact of lymphocytes with pathoges (or simply their antigens), which triggers the specific immune response and immunological memory is p...

KT
Answered by Katerina T. • Biology tutor
16988 Views

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