Question

1.When during the cell cycle is a cell's DNA replicated?

a.G1 phase
b.G2 phase
c.S phase
d.M phase

3.What is the role of the spindle fibers during mitosis?

a.They help separate the chromosomes
b.They break down the nuclear membrane
c.They duplicate the DNA
d.They make the chromosomes visible

Answer 1

DNA replication occurs during the S stage of interphase. Interphase is the stage between two mitotic or meiotic divisions. It can be slpit into three stages:G1, S and G2. During G1 (gap 1), cells grow and build up ATP on preparation for DNA replication. During the S (synthesis) phase the DNA is replicated. During the G2 phase the cell prepares itself for the process of cell division (mitosis or meiosis). See: http://www.emc.maricopa.edu/faculty/farabee/BIOBK/BioBookmito.html

Answer 2

That above is for #1, tell me what you think the answer is.

#2,
They hold the chromatids and during cell division they pull the chromatids away from each other hence facilitating cell division.

What do you get as the answer?