Collagen is a substance that is made up of amino acid linked together to form long, branched polypetide (tertiary protein chains). Thus COLLAGEN is the protein.
D! Predictable and controlled
Growth factors are hormones, proteins, or steroid molecules that regulate many cellular functions. They can stimulate the cell division by giving the signal to the cell to progress in the cell cycle.
<u>Explanation</u>:
Growth factors are naturally produced within the body and travels through the body to bind to their receptors present on their target cells. These growth factors are capable of signalling the cell to divide, proliferate, or heel. Their main aim is to signal or tell other cell when to do and what to do. Due to the binding with the receptors the growth factors activates specific genes.
Well you can mark out a and d.. because cellular respiration uses energy in glucose to make atp
