Growth factors are proteinous substances that occur naturally in the body.
The following functions Growth factors carry out includes:
a. Growth factors are responsible for monitoring, controlling and activating cellular activities in the body. Those cellular activities are: cell multiplication, cell division, cell migration, cell differentiation.
b. Growth factors are molecules responsible for sending signals from one cell to another cell which aids in cellular growth.
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After one round of replication, there will be only two layers one of 14 N and second of 15 N labelled. This is because of total conservation of template. If it was semi-conservative then an intermediate layer will be formed composed of one strand of 14 N and other strand of 15 N. This intermediate strand did not appear in this conservative replication state.