10.1Cell Growth, Division, and

Reproduction

December 1st, 2014

Chapter 10Big Ideas in Biology =

1)

2)

Essential Question = How does a cell produce a new cell?

Random Cell Info:60- 100 trillion cells in an adult human bodyWhere do all these cells come from?!

A single fertilized cell! All cells not the same in your body

Differentiated cells = differentiation

What are some of the difficulties a cell faces as it increases in size?

1) the larger a cell becomes, more demands

the cell places on its DNA. DNA provides information to build new

molecules, controls things cell does and needs.

DNA does not grow, would be like an “information crisis,” if cell grew too large.

After a while DNA cannot serve all the needs of the growing cell…so division is necessary.

What are some of the difficulties a cell faces as it increases in size?

2)Food, oxygen, and water enter a cell through

the cell membrane. Waste products leave in the same way.

The rate at which this exchange takes place depends on the surface area of a cell.

The rate at which food and oxygen are used up and waste products are produced depends on the cell’s volume.

The ratio of surface area to volume is key to understanding why cells must divide as they grow.

Surface Area and VolumeUnderstanding the relationship between a

cells surface area and it’s volume is key to understand that a cell must divide rather than continue to grow.

The surface area does not __________ as fast as the volume.

Ratio of Surface Area to Volume Imagine a cell shaped like a cube. As the

length of the sides of a cube increases, its volume increases faster than its surface area, decreasing the ratio of surface area to volume.

If a cell gets too large, the surface area of the cell is not large enough to get enough oxygen and nutrients in and waste out.

Cell Division:=

Original cell called the “__________” cellSolves the information “overload” and

exchanging materials issues.

Cell Division Solves…1) Information “Overload” by:

First, replicating its DNA.Each daughter cell gets a complete set of DNA

2) Material Exchange Inefficiency by:Reducing volumeIncrease the ratio of Surface area to volume

for each daughter cell. Allows for more efficient exchange, movement

of materials.

Reproduction =

One of the most important characteristics of living things

Asexual ReproductionIn single-celled organisms, cell division is a

form of reproduction called asexual reproduction.

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Examples:

Sexual Reproduction=

Compare/ContrastAsexual Sexual

Sexual ReproductionAdvantages Disadvantages

Asexual ReproductionAdvantages Disadvantages