Cell Size Limitations Why are cells so small?.

Slides:



Advertisements
Similar presentations
WHY DO CELLS DIVIDE? 10-1.
Advertisements

The Cell Cycle.
Cell Size Surface area : Volume Ch 8.2 pg 201. Cell Size Limits Are whale cells the same size as sea stars cells? Yes!
WHY DO CELLS DIVIDE?. IT’S ALL ABOUT SIZE THERE IS AN UPPER LIMIT TO HOW LARGE A CELL CAN BE.
Cell Size Limitations.
Human Biology ATAR Year 11 Chapter 3 Pages
The Cell Cycle. Why are cells so small?? What limits the size of a cell?? –Most cells are between millimeters.
Bellringer Mon, 11/23 1.Why do cells need to divide? List at least 2 reasons.
Why are cells so small? Why are cells so small?. 1. Cells HAVE to be small to be efficient I.) What limits the size of a cell?  Most living cells are.
Why are cells so small?.  Why cells are small? Diffusion limits cell size DNA limits the cell size. Surface area- volume ratio.
Chapter Limits to Cell Growth Demands on cell’s DNA becomes too much for cells and they get bigger. Demands on movement of nutrients and waste across.
Unit 3 Part 2 – The Cell.  Why cells are small? Diffusion limits cell size DNA limits the cell size. Surface area- volume ratio.
Notes – 6.1 Diffusion and Osmosis. 6.1 The Structure and Function of the Cell Membrane The cell membrane has many functions. – protection – obtaining.
Chapter 10 – Cell Size, Mitosis and Cancer. Cells come in a variety of sizes… Red blood cells = 9 micrometers Nerve cells (large animals) = 1m (with small.
Cell Biology Chapter Eight: Cell Processes 8.1 The Cell Membrane 8.2 Cells and Energy.
Cell Size and the Cell Cycle Chapter 5, Section 1 In your textbook.
Cell Growth Limits to Cell Growth Two reasons why cells divide: DNA Overload Exchanging Materials.
Why is the cell membrane important to life?
Cell Growth.
Why are cells so small? Cells are found in every living organism, ranging from unicellular (one-celled) organisms, such as amoebas, to multicellular (many-celled)
Cell Size Limitations Why are cells so small?.
Why are cells so small?.
Cell Growth and Division
The cell cycle is a regular pattern of growth, DNA replication, and cell division.
Chapter 10 Cell Growth and Division
Cell Growth & Reproduction
Chapter 9: Cellular Reproduction Section 1: Cellular Growth
Cell Surface Area and Volume
Sit at a new table with 75% new people
VOCABULARY: chromatid centromere interphase cell cycle mitosis
CELL SIZE AND SHAPE PP
1. DNA Overload A. Most cells contain only one NUCLEUS which controls the cell. B. If cell gets TOO LARGE in size then the nucleus/DNA cannot meet the.
Cell Growth and Division
What problems does size and growth cause for cells?
CELL SIZE B-2 STUDENTS WILL DEMONSTRATE AN UNDERSTANDING OF THE STRUCTURE & FUNCTION OF CELLS & THEIR ORGANELLES.
Cell Size.
Chapter 1: Cells – the Basic Building Blocks of Life
Cell Size Limitation Notes
Chapter 10.1 Cell Growth.
Cell Size Limitations Chapter 8.2.
Cell Growth.
CELLS!.
The cell cycle has four main stages.
The cell cycle.
Cell Growth and Reproduction
Mitosis Cell division.
Copyright Pearson Prentice Hall
Chapter 10 Cell Growth and Division
Cell Cycle Notes Biology Unit 4.
Copyright Pearson Prentice Hall
Chapter 10 B – Cell Growth and Division
Cell Size Surface area : Volume
Copyright Pearson Prentice Hall
Copyright Pearson Prentice Hall
Copyright Pearson Prentice Hall
Cell Size Limitations Why are cells so small?.
Cell Size and the Cell Cycle
Copyright Pearson Prentice Hall
The Cell Membrane The cell membrane has many functions:
Copyright Pearson Prentice Hall
Cell Size Limitations Why are cells so small?.
Copyright Pearson Prentice Hall
Copyright Pearson Prentice Hall
Copyright Pearson Prentice Hall
Cell Size and Growth Chapter 10-1 Pg. 241.
CELL SIZE AND SHAPE PP
CHAPTER 9-1 Cellular Reproduction
Chapter Six: Cell Processes
10-1 Cell Growth Vocabulary: Cell Division
CELL GROWTH Do living things grow because it cells get larger and larger, or because they produce more and more cells? Because they produce more and more.
Presentation transcript:

Cell Size Limitations Why are cells so small?

Why can’t organisms be one big giant cell?

Diffusion limits cell size Movement from higher concentration to lower concentration Larger the distance, slower the diffusion rate A cell 20 cm (8in) would require months for nutrients to get to the center This is about the size of a dinner plate http://www.youtube.com/watch?v=M30PrtZDB8I

DNA limits cell size Larger cells need more DNA. They need more of everything! Most cells have just one nucleus. There is not enough DNA to make all the stuff a cell needs if it gets too big. DNA Replication is complicated: http://www.youtube.com/watch?v=bW5JnYZImJA http://www.youtube.com/watch?v=teV62zrm2P0

Surface area to volume ratio limits size

As volume increases, the surface increases. The problem is that the volume increases more rapidly than surface area. Cell size doubles, 8x as much volume, but only 4x as much surface area http://www.youtube.com/watch?v=xuG4ZZ1GbzI

So, if too big is a problem, what’s the solution? Cells divide before they become too big Process of cell division is called mitosis

TO RECAP: 1. Diffusion limits cell size 2. DNA limits cell size Slow and inefficient over large areas 2. DNA limits cell size Limit to how quickly DNA can be read Limit to # of proteins built / period of time 3. Surface area to volume ratio limits cell size Volume increases faster than surface area Requires more nutrients, get rid of more wastes but through a relatively smaller surface area – it is more difficult for things to get in and out!