198k views
1 vote
A population of T cells was stimulated to proliferate in response to a particular antigen. A sample of 1000 stimulated cells was analyzed for total DNA content. Of the 1000 cells, 400 had a 2n amount of DNA, 200 had a 4n amount of DNA, 200 cells had between a 2n and 4n amount of DNA. Additional analysis revealed that 200 of the cells were in various stages of M phase and that M phase lasted 2 hours. What is the total length of the cell cycle?

1 Answer

5 votes

Answer:

21. 2 hours.

Step-by-step explanation:

The cell cycle of an organism is divided into the the G1 (gap 1) phase, S phase (synthesis phase), G2 phase (gap 2) and mitotic phase.

The length of the cell cycle can be calculated by the following formula;

length of the cell cycle = Total number of cell * time to divide a cell/1000.

Here, time to divide a cell is 24 hours.(Human cells as a reference)

400 had a 2n amount of DNA.

length of the cell cycle = 400 × 24/1000

=9.6 hours.

200 had a 4n amount of DNA

length of the cell cycle = 200 × 24/1000

=4.8 hours.

200 cells had between a 2n and 4n amount of DNA.

length of the cell cycle = 200 × 24/1000

=4.8 hours.

The cells of M phase requires 2 hours.

Total length of the cell cycle= 9.6+4.8+4.8+2 hours

Total length of the cell cycle = 21.2 hours.

Thus, the answer is 21.2 hours (if treating the cell as human cell).

User Goblinhack
by
8.5k points
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.