Question

There are few cells in the body that do not undergo mitosis: most somatic cells divide regularly, some more than others. Take for example the cells that line the digestive tract. These cells must be frequently replaced because they are constantly eroded by the movement of food through the tract. What mechanism(s) is/are in place to ensure that these cells are exact copies of the mother cell? A) DNA restriction point B) DNA template plus DNA damage checkpoints C) the template DNA provides for making copies D) G0, quiescence checks for damage

Answer 1

B

Step-by-step explanation:

A proper balance between cell quiescence and mitosis ensures the right tissue homeostasis. Due to regular erosion of cells in the gut lining they have to be replaced frequently. In this case there are more cell in mitosis phase than quiescent phase. To replace the cells will exact copies, the DNA in the parent cells acts as a template for the duplication of copies for the daughter cells. During duplication in mitosis, there are checkpoints that ensure the process is proceeding with precision as required to produce exact copies. In case there are errors, they are repaired before one step is proceeded by the other. In the case of irreparable damage, these cells undergo induced apoptosis.