Question

question 3
chromosomes are duplicated during.
a the g1 phase.
b mitosis.
c cytokinesis.
d the g2 phase.
e the s phase.
question 4
the phase of mitosis in which the nuclear envelope breaks into small pieces is:
a prophase
b metaphase
c anaphase
d telophase

Explanation:

In the cell - cycle, chromosome duplication occurs during the S (synthesis) phase. During prophase of mitosis, the nuclear envelope breaks down into small pieces.

Answer:

Question 3: E. the S phase
Question 4: A. Prophase