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Comparison of Prokaryotic and Eukaryotic cells

  • Alice Smith

Prokaryotic and Eukaryotic cells

 

Similarities

Differences

Prokaryotic cells

Plasma membrane

Cytoplasm

Nucleoid

Pili

Cell wall (aside from in flower eukaryotic skin cells)

Capsule

Plasmid

Eukaryotic cells

Flagellum

Ribosome's

Nucleus

Nuclear pore

Chromatin

Nuclear envelope

Nucleolus

Mitochondria

Cytoskeleton

Golgi apparatus

Secretory vesicle

Centrosome

Lysosome

Smooth endoplasmic reticulum

Rough endoplasmic reticulum

There a wide range of variations and similarities between prokaryotic and eukaryote skin cells, designed so they can do their jobs.

Prokaryotic skin cells have a nucleoid whilst eukaryotic skin cells have a membrane- destined nucleus.

The nucleus provides the nucleolus, where RNA (ribonucleic acid) is situated and where in fact the RNA is synthesized into ribosome.

The nucleus is bounded by the nuclear envelope which really is a double membrane, this absorbs chemicals through its pores and also allows the discharge when both membranes fuse, and this is how the nucleus feeds.

The nucleus contains all the genomic DNA which is the hereditary information taken by the chromosomes and differs from the nucleoid in a prokaryotic cell because the nucleoid holds information in a circular double stranded DNA. Plasmids take DNA, which can be independent from the nucleoid and are used to transfer information in one prokaryotic cell to some other. This process is named conjugation.

Prokaryotic cells have pili (eukaryotic skin cells do not) they are to help the cell attach itself to bacterias or bacteria put on itself.

They both however have a flagellum to help the cell manoeuvre itself.

Both cells have ribosome and cytoplasm.

The cytoplasm is fluid that fills the cell, inside this there is certainly ribosome. These ribosomes float widely surrounding the cytoplasm; they are being used for the skin cells to combine proteins into an application you can use in the skin cells.

The cell wall that is found in prokaryotic skin cells and eukaryotic flower cells provides the cell with support and helps it be tough and flexible. The reason family pets cells don't have a cell wall is because they don't require this support as they obtain it from the skeleton and muscles.

Another trait of the eukaryotic cell is the smooth and abrasive endoplasmic reticulum. This is actually the organelle that works as a travel system. The chemicals move from elements of the cell to where they have to be using this technique.

There are two kinds of endoplasmic reticulum even and rough. The soft endoplasmic makes necessary protein, sugars and lipids. The abrasive endoplasmic reticulum help to make the proteins that'll be used within the cell or in the surroundings where the cell is.

The Golgi equipment is found in eukaryote skin cells and looks somewhat like a stack of pancakes. The Golgi apparatus sorts the protein and lipids in the vesicles and transmits them to spots in the torso where they are really needed.

The vesicles wait until a protein opens up a route when getting into the cell membrane to allow them to get out to complete their careers.

The mitochondria act as a digestive tract for the cell. They bring the nutrition in and break them down into more energy rich molecules.

A eukaryotic cell has these mitochondria while a prokaryote doesn't.

Word count 509

The sperm cell

The role of a sperm is to fertilise a female egg or female gamete. Its specialised structure to handle its role would be its condition.

Sperm cells are small and upright, they have a long flagellum or tail called a spermatozoon to mobilise and propel them towards the egg. The middle piece of the sperm consists of mitochondria; this can help produce energy for the movements of the sperm. The head of the sperm cell contains a nucleus which include chromosomes and hereditary information.

This information is handed down to the egg to make a whole organism.

In the head there are enzymes which help the sperm rest through the external coating of the egg

Word count up 116

The red blood vessels cell

The role of your red blood cell is to move oxygen across the body.

The red bloodstream skin cells are small; this is so they can pass through capillaries to access where they can be needed. Red blood vessels cells will be the shape of any coin which helps a higher area therefore the cell can defuse more air.

Red blood cells have a skinny membrane to allow them to diffuse oxygen quicker and better throughout your body.

They contain haemoglobin which permits the cell to absorb oxygen in the lungs and release it in to the remaining body.

The cell doesn't have a nucleus that allows more room for haemoglobin

Word count number 114

The fluid mosaic model

All cells need a cell membrane to make it through. This defends the cell from the outside world. The cell membrane is made up of three structures; these are phospholipids, cholesterol and proteins.

Phospholipids have a rounded mind with two fatty acid tails. The phospholipids are jam-packed very tightly in the cell membrane and lie tail to tail; this is because the top attaches to water while their tails repel it. All the phospholipids build-up the phospholipid bilayer. The bilayer contract occurs because the lipids are amphipathic. This implies they have got both polor and non -polor parts in them.

Cholesterols inserts it in-between phospholipids. A cholesterols job is to keep up fluidity within the membrane. Depending on the temperature, cholesterol increase or reduce the cell fluidity.

Proteins will appear in a lot of various ways in the membrane. An intergil protein or a Trans membrane proteins crosses the entire cell membrane. Some proteins take a seat on the cell membrane or on another proteins, these are called proifial health proteins. In rare circumstances proteins can go half way through the membrane or inside the cell membrane. These protein appear randomly throughout the cell. The protein's role is to converse to the cell to tell it what is going on in the exterior world. There other job is to move the molecules in and from the cell.

Carbohydrates called glycoproteins or glycolipids play a big role in communication too. These carbohydrates recognise other cells in the body. These are on the outside of the membrane and usually found on top of lipids or protein.

The phospholipids and protein can move around and over the cell membrane. They can move around in a great deal of different guidelines. This is called the substance mosaic model.

Word count 295

Passive and Productive transport

Just like any other living organism cells need everything e. g. food, oxygen and carbon dioxide to live on.

The transport systems (dynamic and passive) are the way the cells carry these molecules over the membrane. These transfer systems will also take away the waste products. Passive transport means no energy was used for substances to get across the membrane. You will find three different kinds of passive transport:

  • simple diffusion
  • osmosis
  • Facilitated diffusion.

Simple diffusion is the procedure involving the movements of substances from regions of high concentration to low attention over the phospholipid bilayer. This is called diffusing down a focus gradient, due to difference in attention the procedure requires no energy and is how molecules such as carbon dioxide and oxygen enter and out of the cell. These substances can cross at any point along the cell membrane. The way the molecules get over the cell membrane are afflicted by different factors. Included in these are, how steep the gradient is i. e. such as though it is a higher steepness the molecules diffuse faster i. e. if the temperature is high, the molecules will diffuse faster and, if the molecules tend to be permeable it will diffuse faster throughout the membrane. Facilitated diffusion is when the substances require a carrier because they are too large to go and cannot dissolve into the lipids in the phospholipid bilayer. In this case the substances are called polar. The way these molecules get although cell membrane is through protein channels. The proteins make a route for the molecules to get through, this channel is water filled so drinking water- soluble substances can get from one part of the cell to the other.

A proteins carrier is when a molecule goes by through the protein via a protein channel; however these proteins combine with the molecule and make a conformational change whilst moving through the channel to access the cell or outside the cell. Glucose can be an example of the sort of molecule that uses facilitated diffusion.

Osmosis is how drinking water molecules get over the membrane.

Water substances are polar and some may not be able to pass through, nonetheless they are small enough to cross the membrane widely. The molecules move from a higher concentration to a minimal attention across a partly permeable membrane. Generally the molecules move from exterior to the within the cell or vice versa to balance out the concentration. Working carry is when the substances move against a attentiveness gradient (low to high attentiveness). Active transfer requires chemical substance energy (ATP). These molecules such as hydrogen - a billed ion uses a protein to pass through the membrane, however ATP provides health proteins energy to transfer the ion over the membrane.

Endocytosis and exocytosis are types of lively transport.

Endocytosis is a big molecule entering the cell. The surrounding membrane forms a vesicle for the cell enabling the molecule to reach inside the cell effectively.

Endocytosis is important because it enables large and essential molecules to pass through the membrane.

Exocytosis is the change, where large molecules leave the cell in the same way. Exocytosis is important because this is one way cells get rid of their misuse.

Word count up 527

Mitosis and Meiosis

Mitosis is the duplication of cells to displace cells lost credited to destruction or death. In this process the cell reproduces to make two equivalent daughter skin cells and similar to its father or mother cell. A good example of this might be if you slice yourself, your body uses mitosis to repair the slash. Both cells have the same hereditary information. If the cell is not reproducing it is within what is called the interphase or the resting state.

Prophase is the first level of mitosis and in this phase the cell copies its DNA and provides the cell in to the right position for the process to occur. The chromatids sign up for the centromere and the kinetochores connect to the microtubules.

The second stage of mitosis is the prometaphase is when the exterior of the cell called the nuclear envelope dissolves.

Metaphase is the next level. The chromosomes line up on the central axis (or midsection) of the cell.

Anaphase is another stage, in this the chromosomes move to complete opposite ends of the cell to the poles.

Telophase is the next stage - in this the skin cells form nuclei across the chromosomes. the cells then create a new nuclear envelope.

Cytokinesis is what happens at the end of the telophase and where in fact the cells split and pull aside from the other person by creating a cleavage furrow.

Once the skin cells are completely apart the routine is complete and 2 new indistinguishable cells have now been developed and these cells enter into the interphase or resting phase prior to the whole cycle starts all over again.

Meiosis is very similar to mitosis, however in mitosis the cell creates 2 identical skin cells, in meiosis the cell creates 4 different cells. Meiosis occurs in eukaryotic microorganisms that reproduce sexually. This consists of plants and animals. The periods are all the same as mitosis however in meiosis they do go through the phases then do everything again (meiosis I and meiosis II) it is because meiosis if for duplication. In meiosis the interphase only happens once and before meiosis begins.

The cell starts with one chromosome from each gamete (female and male intimacy cell) Inside the first prophase the chromosomes range themselves up with their homologous pairs and cross over. Homologous means the skin cells are around the same size and support the same type of information. During prophase I crossing over happens, this is when the chromosomes transfer and exchange their DNA between one another. That is why we look different from our siblings and parents because the skin cells are not similar. The skin cells also use a genetic variation called 3rd party assortment. The chromosomes line up arbitrarily during metaphase I so they get a mix of both different gamete cells.

In the end you can find 4 cells created, both have 23 chromosomes which is half the hereditary information of a standard cell. This cells are known as haploid cells. This implies they contain one complete set of chromosomes. They are normally sperm and egg.

When the sperm and egg cell get together they create an embryo that may have right amount of chromosomes.

Word count up 521

Total word count number 2157

References

"The bilayer set up occurs because the lipids are amphipathic"

Tortora Grabowski (2003). Ideas of Anatomy & Physiology. 10th ed. USA: John Wiley & sons. Inc. . 61.

"Meiosis occurs in eukaryotic organisms that reproduce sexually. This includes plants and animals"

Regina Bailey. (). Periods of Meiosis. Available: http://biology. about. com/od/meiosis/ss/meiosisstep. htm. Last accessed 28/10/2014.

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