Thursday, November 29, 2012

The Gatekeeper of Cells

What structure allows only certain things to pass in and out of the cell. 
How is the structure different between plants and animals?



Something to think about 
Why are single celled organism so small? Why don't we ever see hippo sized single celled organism ? 

81 comments:

cameron s said...

The cell membrane allows only certain things to pass in and out of the cell.

cameron s said...

plants have cell walls

Bryn W. said...

The Cell Membrane. Plants have a cell wall that is rigged. Animals do not have cell walls, though.

Maddy C. said...

The cell membrane allows only certain things. This structure is different in plants and animals because in a plant cell the membrane is inside the cell wall.

Christian T said...

animals have a cell membrain and plants has a cell wall.

Connor.R said...

the cell membrane keeps backtiera out

Riley O said...

cell membrane one is a sphere & the other one is like a cube

Connor.R said...

plants have cell walls

James D said...

the cell wall for plants

Aja A. said...

The cell membrane allows only certain things to pass through into the cell. This structure is different in plants an animals because in a plant cell there is a cell wall and in an animal cell there isn't a cell wall.

Garrett H said...

The cell membrane allows only certain things to pass in and out the the cell

Zach S. said...

The cell membrane allows some good things and some bad things through the cell, good thing's are particles bad things are chemicals.Cell walls let things through into the cell sometimes it's on the outside sometimes it's on the inside of the cell.

Shane.D said...

cell membrane is the only thing that can pass thought things

Jordan M said...

The cell membrane allows only certain things to pass in and out of the cel


answers.com

Lauryn Silva said...

The structure that only allows certain things to pass in and out of the cell is called the cell membrane. In plants the structure that only allows certain things to pass in and out of them is called the cell wall.

Jordan M said...

*cell

Aaran H. said...

The membrane and cell wall allow good and bad stuff to pass through it.

Austin H said...


well the cell membrane keeps particles going in and out

Dominique G. said...

The cell membrane. Animals doesn't have a cell wall.

TImmy Light said...

the cell membrane does not have a cell wall

DAVID H said...

The different between plants and animals is animals has a cell wall. plants do not have cell wall

TImmy Light said...

On a animal they do not have a cell wall

EmilyB said...

The cell membrane. Animals doesn't have a cell wall.

Emily B. said...

plants have cell walls.

Katie L. said...

The cell membrane let's certain things pass in and out of the cell.

MorganD said...

The membrane and cell wall allow good/bad stuff to pass through it.

Max H said...

the structures are different because they're different shapes.
single cell organisms are small because there is only 1 cell!!! and usually alot of cells make up a big structure such as a human. we dont see a hippo sized one cell organism because one sized organisms are small.

Cassidy m said...

The structure that only allows certain things to pass in and out of the cell is called the cell membrane. In plants the structure that only allows certain things to pass in and out of them is called the cell wall.

Anonymous said...

The cell membrane keeps stuff in the cell and makes it sure that nothing escapes

Aasyhia said...

the cell membrane only allows certain things to pass in and out of the cell

jesse.g said...

The cell membrane allows only certain things to pass through into the cell. This structure is different in plants an animals because in a plant cell there is a cell wall and in an animal cell there isn't a cell wall.

Reply

Anonymous said...

What structure allows only certain things to pass in and out of the cell.
How is the structure different between plants and animals?cell membrain
plant cell have ridged cell wall

ALice M. said...

The cell membrane is the structure that allows only certain things in and out of the cell. The difference between the structure of animal and a plant cell is that the plant cells are rigid, so They can't move around.

nathan.b and joe.k said...

the structure is the cell membrane
the cell has a rigid membrane and
the animal cell membrane is smooth

Jada M. said...

the structures are different because they're different shapes.
single cell organisms are small because there is only 1 cell!!! and usually alot of cells make up a big structure such as a human. we dont see a hippo sized one cell organism because one sized organisms are small.

Carly M. said...

The structure that allows only certain things to pass in and out of the cell is the cell membrane.
They are different because animal cells don't have cell walls and plant cells do.
They are so small because cells are the building blocks of the body.

Anonymous said...

well i know that multi cellular organisms have a much more complecated structure and process but a single cellular organism has a process called the cellular resportary syestem and this works well but mostly on small single celled organisms becasue if you had a large organisms the size or dogs then by the time the oxygen from the H2O would get to the nuclei the paramecium or what ever organism you are specifying it would die that is why single celled organisms are so small...size matters.

smitty said...

cell wall and membrain membrain alows u to move

Jasmine B said...

The structure that allows certain things to pass through the cell is the membrane, witch is in the animal cell. in the plant cell, they call it the cell wall.

catie riley said...

it is cell membrane and there so small becuase they have 1 cell and if they were bigger then they are called multi celled organisms and not single cell organisms and

kevin s <> said...

cell membrane

Maddy P. said...

The structure that only allows certain things to pass in and out of the cell is the cell membrane, which is in the animal cell. The plant cell calls it the cell wall.

joe w said...

the cell membrain blocks the unneeded stuff

Owen R said...

That is the cell membrane

Journey B. said...

The Cell Membrane. It allows certain things to pass through it and into your body. It only allows things that help you through. Animal cells don't have cell walls, but plants have cell walls.

Cj W. said...

the structures are different because they're different shapes.
single cell organisms are small because there is only 1 cell! and usually alote of cells make up a big structure such as a human. we don"t see a hippo sized one cell organism because one sized organisms are small.

Zachk said...

The structure that allows things to pass through is the cell membrane, which is in the animal cell.

Shane k said...

Cell membrane allows things to pass in and out, the cell membrane is different then in each animal and plants.

Lauren S. said...

It is the cell membrane and it is in plant and animals they call it the cell wall.so the size does not matter.

Kaylee C. said...

The cell membrane is the gatekeeper of a cell. It allows things to pass in and out of it and into your body. It only will let things that are healthy for you through. The animals cells do not have cell walls, and the plant cells do.

Matt C <><><><><<><> said...

the structure that allows certain stuff to pass through them there walls is the membraine witch is in the animal cell. in the plant cell they call it the cell wall

AndrewE said...

It is a cell membrane. A plant has a cell wall and an animal has a cell membrane.

Gia L said...

Cell membrane. Plants aren't as flexible because of the cell wall. We are able to move because of the cell membrane.

Anonymous said...

one has an outer fence.

Parker D. said...

The cell membrane allows only certain things to pass in and out of the cell. The structure is different because plant cells have a cell wall and animal cells don't.

Alissa H said...

The structure that only allows certain things to pass in and out of the cell is the cell membrane (part of animal cells). Plant cells have cell walls.

Cameron.T said...

The cell membran

Nathan C. said...

The Cell Membrane

ConnorB said...

The cell membrane allows it. The plant cell has a cell wall and the animal cells do not.

Skyler D. said...

The cell membrane allows items to pass through or not to pass through.

Sheila A said...

The structure that allows only certain things to pass in and out of the cell is the cell membrane. Animal cells have cell membranes whereas plant cells have cell walls.

Zoe D said...

The cell membrane only allows certain
things to pass in and out of the cell.

Emily H said...

The Cell Membrane. It allows certain things to pass through it and into your body. It only allows things that help you through. Animal cells don't have cell walls, but plants have cell walls.

Kelsey S. said...

The cell membrane! thy are rigid!

BruceB said...

Cell membrane. Plants aren't as flexible because of the cell wall. We are able to move because of the cell membrane.

Morgan S said...

the membrane of a cell allows chemicals and liquids through or not pass through the cell.

Hayley G said...

The cell allows some things pass in the cell and go out of the cell!!

Mara C. said...

The cell-membrane ,the The cell wall on a plant is stiff and the animals can move and bend.

Kelsey S. said...

that doesn't make sense!

Aidan R said...

the structure that allows only certain things to pass in and out of the cell is the cell membrane. Animal cells have a cell membranes and plant cells have cell walls.

Whitney R said...

The Cell Membrane allows only certain things to pass in and out of the cell.
The plant has a Cell Wall but the animal does not.

Jenny C said...

Cell Membrane.Plants have cell walls which are riged.

adam p said...

A cell membrane allows only certain things. This structure is different in plants and animals because in a plant cell the membrane is inside the cell wall.

JENN W said...

cell membrane only certain thing to pass in or out.

chanced said...

The structure that only allows certain things to pass in and out of the cell is called the cell membrane. In plants the structure that only allows certain things to pass in and out of them is called the cell wall.

Skyler D. said...

The reason that the structures are different is because, plant cells stay together so they don't move as much, and the animal structures are different because animals move around a lot more.

Mia W said...

The Cell Membrane allows things to pass in and out of the cell. Plant cells have a cell wall while animal cells don't.

Arlo p said...

The structure that allows only certain things to pass in and out of the cell is the cell membrane. Animal cells have a cell wall and plant cells don"t

Jacob G said...

Cell membrane. Plants have cell walls which are very rigid.

david vincent said...

The cellulose allows material to pass through a plant.

DARREN P. said...

the cell membrane lets certain things by it and the differents is there is a cell wall is on plants and not animals.