Assignment+2

Cell Model  There is a gallery of student images and files at Cell Model Gallery

You are to produce a model of a Cell. Your model can be 2D or 3D and can be created in any way you choose. An example may be to use a plastic bottle as your cell, with a table tennis ball as the nucleus and jelly as the cytoplasm etc… You are limited only by your imagination.

You need to complete only one cell model and you can choose between a PLANT and ANIMAL cell.

All parts must be clearly labeled. Include the parts listed in task 2 of this project.

Task 1 will be assessed according to the following criteria:

Model includes all parts (8 marks)

Presentation of Cell (8 marks) Includes : · Colourful · Size of parts according to scale · Labels easy to read · Degree of care/creativity

__Task 2 __

Task 2 is to be typed and submitted with your cell.

Your task is to define each of the following parts of a cell.

Cell Wall, chloroplast, cytoplasm, mitochondria, vacuole, chromosomes, nucleus, and cell membrane (these should have been included in your model).

Each definition must include:

- the type of cell/s that it is found in - it’s function

Some of the information is in your text books but you will need to do some research for this task.

Task 2 will be assessed using the following criteria

Type of cell organelle found in (1 mark per organelle) Function of organelle (2 marks per organelle)  Below is my cell model and definitions Task 1 - Create a Cell Model



Task 2 - Definitions

Cell Wall: The plant cell wall provides the most significant difference between plants cells and other cells. It is up to many micrometers in thickness and, due to its rigid shape, it also gives plant cells a defined shape. The cell wall is the reason for the difference between plant and animal cell functions. Because of its rigid structure, plant cells do not have the opportunity to develop nervous systems, immune systems and mobility. This cell does not have an outer membrane but is stronger than any other. Cell walls are found on all cells.

Chloroplast: The chloroplast is the part of the cell responsible for photosynthesis. It has a permeable outer membrane, a less permeable inner membrane, an inter-membrane space, and an inner section called the stoma. This type of cell is found in a plant cell.

Cytoplasm: Cytoplasm is the jelly-like substance that fills the cell. It is eighty percent water and is usually clear in colour. It is more of a thick substance than a watery one and is found inside the cell membrane. Cytoplasm is found in all cells.

Mitochondria: The mitochondria are the power centres of the cell, and come in a variety of shapes, being about the size of bacteria. They are membrane-bound organelles, and like the nucleus, have a double membrane.

Vacuole: The vacuole is responsible for maintaining the shape and structure of the cell. Plants do not grow by increasing the size of the cytoplasm; they increase the size of their vacuoles. It is a large vesicle which is also used to store nutrients, metabolites and waste products. It is only found in plant cells.

Chromosomes: Chromosomes are only found in animal cells, and are found in the nucleus (see definition for nucleus below) of each cell, where the DNA molecule is packaged into thread-like structures... chromosomes! Each chromosome is made up of DNA tightly wrapped many times around proteins called histones, which support its structure. Chromosomes are not visible in the cell’s nucleus when the cell is not dividing, not even under a microscope, but the DNA that makes up chromosomes becomes more tightly packed during cell division and is then visible through a microscope.

Nucleus:

<span style="display: block; font-family: 'Aparajita','sans-serif'; font-size: 14pt; line-height: 115%; margin: 0in 0in 10pt;">The nucleus is a bit like the brain of a cell, helping control eating, movement and reproduction. It is not always in the centre of the cell, it will be a big dark spot somewhere in the middle of all of the cytoplasm. However, it probably will not be found near the edge of the cell, because that might be a dangerous place for it to be. It can be found in most plant and animal cells.

Cell Membrane:

<span style="font-family: 'Aparajita','sans-serif'; font-size: 14pt; line-height: 115%;">All cells have membranes, the difference between them being that plant cells have rigid cell walls while animal cell membranes are flexible. It can automatically fix itself when torn, making it a very handy membrane to use. The truly special part of the cell membrane is the presence of different proteins on the surface that are used for many things, such as cell receptors, enzymes, surface antigens, and transporters.