3.1 Review Questions
Key Concepts
1. Why is cell division important?
It leads to growth, development, and repair.
2. How is genetic material
organized in eukaryotic
cells?
It condenses and forms
chromosomes.
...but what are chromosomes?
The physical structure in the cell that contains
the cell's genetic material.
3.1 Review Questions
Key Concepts Continued...
3. Explain how cell division is
involved in the growth,
development, and repair of an
organism.
Cells divide to make more cells,
which allow multicellular
organisms to grow. As cells
divide, they specialize.
Damaged cells are also
replaced by cell division.
Hmm...let's see who did
their reading carefully...
Cell division is always
occurring! What is the average
lifespan for a cell in your throat
lining?
2-3 Days!
What do they mean when they
say our cells are "specialized?"
Each cell is specialized to
perform a different function.
Some might be layered skin
cells...some might be long
nerve cells.
3.1 Review Questions
Critical Thinking
4. Explain how DNA compacts
before a eukaryotic cell
divides.
It wraps in coils around
proteins, and then compacts
further as it arranges into
chromosomes.
Hmm...can you label this?
1. What is this a
picture of?
This is a
chromosome.
2. Label the two
parts.
A. chromatids
B. Centromere
3. What makes up
the chromosome?
DNA!
B.
A.
proteins
3.1 Review Questions
Critical Thinking
5. Why do you think that injuries to the skin
generally heal faster than injuries to the
brain?
Skin cells wear out quickly, so they
duplicate frequently. Brain cells usually last
a long time and do not replace themselves
often. Skin heals faster b/c its cells are
better equipped to replace themselves.
3.1 Review Questions
Challenge
6. Describe the stages of development in
a multicellular organism that is familiar to
you.
Answers will vary based on organism
chosen.
My example: Sea Turtle.
1. The embryo growing inside this egg
started out as a single cell.
2. When it hatches, the baby turtle has
trillions of cells (they keep dividing and
making more!)
3. The adult turtle has more than 100
times the cells of the baby turtle.