Cell signalling pathways are used to maintain homeostasis. Enzymes are normally present in adequate concentrations but whenever the need for a particular enzyme or protein arises, cell signalling is used.
Signal is sent to that particular cell, the process of genetic expression is activated. A gene that codes for that particular protein(enzyme of interest) goes through transcription, where that genes DNA is copied to make a messenger RNAmolecule, which is further expressed by a process called Protein expression. Lastly, transported to that particular area where it is needed.
DNA is the same in every cell in the body. They all read from the same genetic blueprint, whether they are muscle cells, skin cells, or heart cells.
it is Because they use the same set of genes in different ways, and these cells are different. So despite the fact that every one of our cells has the equivalent of 20,000 or so genes, every cell can choose which ones it needs to "turn on" and which ones it needs to keep "turned off. heart cells have unexpected attributes in comparison to skin cells since heart cells express unexpected genes in comparison to skin cells.
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Answer: C
Explanation: Earth's atmosphere isn't very dense because it is made of air, which floats. Human beings are denser then air since they are solid, but not as dense as Earth's crust, which is rocky and the densest out of the three.
Answer:
it increased so fast because as more and more came to be, their genes evolved to allow them to adapt to their surroundings and prededators which allowed them to live longer, strive in the envirnoment and make even more babies.
Explanation:
Answer:
force of volcanic eruption
