Cell Cycle- Intro and Interphase

Question 1

What happens to SA:Vol. ratio as cells get larger
-what issue arises, so what does the cell need to do, otherwise, what will happen?
-what must new growth come from instead?
-what is the cell cycle, and what 2 phases does it contain?

Answer 1

-it decreases along with efficiency
-the plasma membrane becomes too small to meet its metabolic needs, so it needs to STOP growing, or it will die
-addition of new cells/ cell division
-the life cycle of a cell, contains the interphase and mitotic phase

Question 2

Interphase: how much time (%) of the cycle
-what does it do
-3 stages

Answer 2

-90%
-preparing for mitosis
-G1 (gap 1 phase), S phase (synthesis), G2 (gap 2 phase)

Question 3

Gap 1 (G1)
-what happens in this phase

S Phase (synthesis)
-what happens in this phase

G2 (Gap 2 phase)
-what happens in this phase

Answer 3

1. cell grows in size and mass
2. copy of cells DNA is made, each chromatin is duplicated and forms a pair of sister chromatids (each is identical copy of parent chromosome)
3. cell makes materials needed for mitosis, specifically cytoplasm organelles. the most important one is the centrosome