NEET BIOLOGY

CELL STRUCTURES AND FUNCTION

CELL CYCLE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Why is S phase of the cell cycle essential for cell division?
A
the S phase allows the cell to grow to the proper size for mitosis to be successful
B
produces two chromatids per chromosome
C
S phase doubles the number of chromosomes per cell
D
S phase halves the number of chromosomes per cell
Explanation: 

Detailed explanation-1: -S phase (Synthesis Phase) is the phase of the cell cycle in which DNA is replicated, occurring between G1 phase and G2 phase . It also duplicates a microtubule-organizing structure called the centrosome. Hence the correct option is Amount of DNA doubles in each cell.

Detailed explanation-2: -The S phase of a cell cycle occurs during interphase, before mitosis or meiosis, and is responsible for the synthesis or replication of DNA. In this way, the genetic material of a cell is doubled before it enters mitosis or meiosis, allowing there to be enough DNA to be split into daughter cells.

Detailed explanation-3: -Then, at a critical point during interphase (called the S phase), the cell duplicates its chromosomes and ensures its systems are ready for cell division. If all conditions are ideal, the cell is now ready to move into the first phase of mitosis.

Detailed explanation-4: -S phase (DNA Synthesis)-Each of the 46 chromosomes are duplicated by the cell. III. G2 phase (Gap 2)-The Cell “double checks” the duplicated chromosomes for error, making any needed repair.

Detailed explanation-5: -The synthesis (S) phase of the cell cycle is of critical importance to precisely replicating the genomic information encoded in the nucleus of the cell. The G1 to S phase transition requires the activation and signaling of a number of specific components, including CDKs and Myc.

There is 1 question to complete.