Biology Questions and Answers

Biology Questions and Answers

phase and the mitotic is the following
phase.

11. What are the three periods
    into which interphase is
    divided?

Interphase is the preceding phase to the
mitoticperiods, G1, S an division. It d G2 (tis divided into thrhe letter G ee
comes from “gap”, meaning interval or
breach, “synthesis”,and the letter S com indicating the period ines from
which DNA replicates).
In fact, “gap” is not totally appropriate
for the periods immediatelyafter the DNA synthesis. The idea of before and
“growth” would be more adequate since
in those periods (G1 agrowing to divide later in nd G2) the cell ismitosis.

12. In general which phase of
    the cell cycle has longer
    duration?

The interphase 4/5 of the cell cycle and the mitoticcomprises approximately
phase has quite a shorter length.

13. What are the events that
    mark the beginning and the
    end of the first interphase
    period? What happens within
    the cell in this period?

The first interphase pbegins with the end of the preceding celleriod is the G1. It (^)
division, i.e., with the formation of the
new cell and it ends with the beginning
of DNA rcell is growing.eplication. In the G1 period the

14. What are the events that
    mark the beginning and the
    end of the second interphase
    period? What happens in the
    cell in this period?
    The second interphase period is the S.

It startsreplication an with thd finishes with te beginning of DNAhe end of (^)
that process. The main event in this
period is the synthpolynucleotide chains, each esis of newbound to (^)
each DNA chain that served as a
template, i.e., original set of DNA mthe duplication of olecules. the

15. What are the events that
    mark the beginning and the
    end of the third interphase
    period? What happens in the
    cell in this period?
    The third interphase pbegins with the end of DNA reeriod is thplicatione G2. I t
    and ends with the beginning of the first

period of the mitoticcell is growing too and the duplication of phase. On G2 the (^)
centrioles occurs (only in cells that have
these structures).
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