BIO 156 EXAM 3 QUESTIONS AND ANSWERS
WITH COMPLETE SOLUTIONS | UPDATED
2025
What is the main purpose of the cell cycle? - ANSWER To create 2 identical
cells with same DNA and organelles.
What are the stages of interphase? - ANSWER G1, S, G2
What essentially happens during interphase? - ANSWER Preparing for mitosis
What happens in the G1 phase? - ANSWER Recovery from previous division,
cell grows, organelles double, accumulation of material for DNA synthesis
What happens during the S phase? - ANSWER DNA gets replicated, replication
of chromatids
What happens during G2 phase? - ANSWER Synthesize proteins for mitosis
What happens at the G1 check point? - ANSWER p53 stopes cycle of DNA
damaged
What does p53 do? - ANSWER Triggers apoptosis
What is apoptosis? - ANSWER Programmed cell death
, What does the G2 check point do? - ANSWER Stops if DNA not properly
replicated
What does the M check point do? - ANSWER Stops if chromosomes not
properly attached
Is apoptosis always bad? Why or why not? - ANSWER No. Allows only a certain
number of cells in the body, and prevents tumor/cancer
What basically happens during the M phase? - ANSWER Mitosis and
cytokinesis
What does cytokinesis mean? - ANSWER Cytoplasm division
What is a chromosome? - ANSWER Highly coiled and condensed chromatids
How many pairs of chromosomes do humans have? - ANSWER 23 pairs
What are diploid cells? - ANSWER all cells that are not sex cells
If a cell is diploid what does that mean? - ANSWER Two of each chromosomes
present
What are haploid cells? - ANSWER All sex cells (sperm and egg)
WITH COMPLETE SOLUTIONS | UPDATED
2025
What is the main purpose of the cell cycle? - ANSWER To create 2 identical
cells with same DNA and organelles.
What are the stages of interphase? - ANSWER G1, S, G2
What essentially happens during interphase? - ANSWER Preparing for mitosis
What happens in the G1 phase? - ANSWER Recovery from previous division,
cell grows, organelles double, accumulation of material for DNA synthesis
What happens during the S phase? - ANSWER DNA gets replicated, replication
of chromatids
What happens during G2 phase? - ANSWER Synthesize proteins for mitosis
What happens at the G1 check point? - ANSWER p53 stopes cycle of DNA
damaged
What does p53 do? - ANSWER Triggers apoptosis
What is apoptosis? - ANSWER Programmed cell death
, What does the G2 check point do? - ANSWER Stops if DNA not properly
replicated
What does the M check point do? - ANSWER Stops if chromosomes not
properly attached
Is apoptosis always bad? Why or why not? - ANSWER No. Allows only a certain
number of cells in the body, and prevents tumor/cancer
What basically happens during the M phase? - ANSWER Mitosis and
cytokinesis
What does cytokinesis mean? - ANSWER Cytoplasm division
What is a chromosome? - ANSWER Highly coiled and condensed chromatids
How many pairs of chromosomes do humans have? - ANSWER 23 pairs
What are diploid cells? - ANSWER all cells that are not sex cells
If a cell is diploid what does that mean? - ANSWER Two of each chromosomes
present
What are haploid cells? - ANSWER All sex cells (sperm and egg)
