Question

Which one of the following events is incorrect for the cell cycle?
A)All events are under genetic control
B)Maximum cell growth occurs in M-phase
C)DNA synthesis occurs only during one specific
D)Centriole duplication occurs in S-phase

Answer 1

Hint: Whatever is happening inside the cell is under genetic control. Even, the cells which respond to the environment are also under genetic control. A cell cycle is a process in which different events occur which keep dividing the cells under regulation. It decides whether a cell should divide or not.

Complete answer:
Cell cycle - all the events that occur in a cell and prepare it for the cell division comes under the cell cycle. It is a four-stage process. In gap 1 or $G_1$ stage - cell increase in size, in S stage- copies its DNA that is a synthesis of DNA takes place, in gap 2 or $G_2$ stage - it prepares the cells to divide and in mitosis phase or M stage - cell divides.
-The $G_1$, S, and $G_2$ all make up the interphase, which accounts for the span between cell divisions. -the cell decides where it should enter the cell cycle and divide or not on the basis of the stimulatory and inhibitory messages which a cell receives.
Genetic Control - whatever the events that take place during the cell division are under genetic control. For the control of cell growth and its division, a variety of genes are involved. Cells replicate itself in an organized manner and step-by-step fashion during the cell cycle and ensure that the dividing cells i.e DNA are copied properly or not. If there are any errors present on the DNA, is repaired or not and also checks that its daughter cells receive a full set of chromosomes. All this process occurs in a tight regulation.
-If it is found that any signals are faulty or missing then its results can be cancerous (too many cells are produced).
-So, except, the events for genetic control all other events i.e. the maximum cell growth occur in M- phase, DNA synthesis occurs only during one specific phase and Centriole duplication occurs in S- phase are correct because these are under the control of the cell cycle whereas the events that occur during cell division are under genetic control.

So, the correct answer is, "All events are under genetic control".

Note: -Number of events that take place in a cell which results in a duplication of DNA and also the division of cytoplasm and organelles to produce two daughter cells refers to the cell cycle.
-The cell division is very important because of the following reasons-
1)For the survival and growth of organisms.
2)Maintaining chromosome numbers.
3)Damaged cells renewable