cell signalling and cell recognition- lqc 7 Flashcards
how do cells form tissues (cell recognition)
Similar specialised cells recognise each other using adhesion/recognition molecules, which are proteins or glycoproteins found on the cell membrane . These molecules have complementary shapes and can bind to each other through the tissue fluid which surrounds the cells. The cells form a tissue.
gene expression and development
The epigenome helps to control the change from a zygote to an adult. During development, epigenetic changes will bring about specialisation of the cell. Signals from inside and outside the cell result in changes to the epigenome that alters the genes transcribed at specific times and locations.
how are master genes involved in early development of an organism?
Master genes control the development of segments of an organism, i.e. legs, hands etc.
The master genes produce mRNA that is translated into signal proteins. These proteins switch on the genes responsible for producing the proteins needed for specialisation of cells in each segment.
how is apoptosis involved in development?
Apoptosis is programmed cell death – the process in which healthy animal cells die during the normal development of an organism, in particular places such as between the fingers .
