Essays Tagged: "Cell wall"
Biology experiment on osmosis for gcse very good got an A* as course work so do not miss out
use the low concentrated area tries to dilute the opposite via osmosis.The effects osmosis has on a cell are either that it becomes turgid and hard as water enters the cell or it becomes dehydrated (t ... id and hard as water enters the cell or it becomes dehydrated (this is called plasmolysing in plant cells) as water leaves the cell and the solution enters. There is a change of mass, volume, texture ...
Subjects: Science Essays > Biology > Plant Biology
"Experiment to investigate the effect of osmosis in potatoes" A GCSE experiment looking at the effects of the concentration of sucrose solution on osmosis in potato tubers.
s in PotatoesThe aim of this experiment is to investigate the movement of water in and out of plant cells. The cells chosen for study will be taken from potato tubers. Firstly I will explain what osmo ... nes are very thin layers of material which allow some things to pass through, but prevent others. A cell membrane is semi permeable. They allow small molecules like oxygen, water, amino acids etc. to ...
Subjects: Science Essays > Biology
Plan cells.
The Plant Cell Cell Wall Size: Around 1µ Basic Function: * Hold the shape of the cell. * Strengthen the ... : Around 1µ Basic Function: * Hold the shape of the cell. * Strengthen the cell. Covering the cell membrane of the plant cell, there is the cell wall. The cell wall is composed of two layers of ... e of the plant cell, there is the cell wall. The cell wall is composed of two layers of rigid, hard cellulose embedded in compounds like pectin and lignin. Pores in the cell wall allow molecules to pa ...
Subjects: Science Essays > Microbiology
The Advantages of using Enzymes in Biotechnology.
done in a variety of methods, such as, absorption, gel or membrane entrapment, encapsulation or by cellulose or covalent bonding. A good example of encapsulating is in the production of biological wa ... ns.Lipase - breaks down lipid stains into fatty acids any glycerolAmylase - break down starch stainsCellulase - break down the ends of the damaged cotton fibres to remove the'fuzz' produced during was ...
Subjects: Science Essays > Biotechnology
All about Bacteria.
NotesBacteria are small, single cells and are the only ones characterized by prokaryotic organization. Too tiny to see with the nake ... nly ones characterized by prokaryotic organization. Too tiny to see with the naked eye, a bacterial cell is usually one of three basic shapes; bacillus, a rod shaped cell; coccus, a spherical cell; or ... f three basic shapes; bacillus, a rod shaped cell; coccus, a spherical cell; or spirillum, a spiral cell. A few kinds of bacteria aggregate into stalked structures or filaments.A bacterium's plasma me ...
Subjects: Science Essays > Biology
Osmosis, of potato chips, got real good mark.
ng osmosis. E.g. if water is withheld from a flowering plant then the plant will wilt. If bacterial cells are placed in concentrated salt-water solution, they collapse and die. Human blood cells place ... smosis and the movement of the water molecules as described above:Osmosis takes place in both plant cells and animal cells. Animal cells do burst in pure water. The cytoplasm inside the cell is quite ...
Subjects: Science Essays > Biology
To investigate how concentration effects osmosis on potato chips.
olecules, like sugar. A membrane like this is called semi-permeable.This experiment shows osmosis: -Cell A Cell Bbecause osmosis is the movement of particles from a weakconcentration to a strong conce ... d leaf will be more concentrated because it has lost water and the leaf will dry out.If a red blood cell is put in water, water enters the cell by osmosis. This is called endosmosis. The cell swells u ...
Subjects: Science Essays
Bacteria
* Bacteria- Bacteria are cells that are big enough to be seen under a light microscope.- Bacteria are found everywhere: - in ... d others are harmful that cause diseases such as pneumonia, tuberculosis, scarlet fever.- Bacterial cell: has a cell wall, cell membrane, a loop of DNA.Cell WallCell MembraneLoop of DNA*Bacterial grow ... eria can be grown in sterile conditions in the laboratory.- A colony of bacteria starts with just 1 cell.- It divides into 2 cells, then the 2 divide into 4, then the 4 divide in to 8, then the 8 divi ...
Subjects: Humanities Essays > Health & Medicine
Explain why the concentration of water in cells should be maintained within a narrow range for optimal function.
Water in cells should be maintained in narrow range of concentration for optimal function.What happens if wat ... ined in narrow range of concentration for optimal function.What happens if water concentration of a cell increases beyond the range?If we put a cell in a hypotonic solution... (Solution with less salt ... lectively permeable membrane.Therefore water molecules move from external watery environment to the cell. This is known as endosmosis.If a plant cell has lower water potential than the narrow range, w ...
Subjects: Science Essays > Biology
Discuss the similarities and differences between prokaryote and eukaryote cells.
The cell is the basic functioning unit of organisms in which chemical reactions take place. These reacti ... e place. These reactions involve an energy release needed to support life and build structures. The cell consists of membrane bound organelles, which are responsible for the division of labour. There ... e bound organelles, which are responsible for the division of labour. There are two main classes of cells- Prokaryotes which are cells without a nucleus, where the DNA is spread around the cytoplasm o ...
Subjects: Science Essays > Biology
Cell walls revised.
Plant cells have a cell wall, large central vacuole, and plasmodesmata.Like other eukaryotes, plants have ... r eukaryotes, plants have a nucleus, plasma membrane, mitochondria, and other organelles, but plant cells differ from animal, fungal, and protist cells in a number of important ways. The most obvious ... , and protist cells in a number of important ways. The most obvious difference is the presence of a cell wall which surrounds each cell. It is composed primarily of cellulose, a complex carbohydrate m ...
Subjects: Science Essays > Biology
Complete IGCSE 2005 Biology Syllabus.
ication of living organism1.- Reproduce- Feed- Respire- Grow- Excrete- Move- Sensitive- Made out of cells2.Nutrition: FoodExcrete: Faeces of animals, digested left over of food, wasteRespiration: Gain ... Sensitivity: Interaction with nature, feelingsReproduction: Sexual Intercourse, production of a new cell, by union of sperm and egg to form zygoteGrowth: Ability of to reproduce and replace cellsMovem ...
Subjects: Science Essays > Biology
Year 12 Biology Coursework; Why does raw turnip taste sweeter than raw potato?
ng it a lot more easier to distinguish which has the highest concentration of dissolved sugar.Plant cells have a cell surface membrane. Outside this there is the cellulose cell wall. Inside a plant ce ... a solution of solutes, many of which can be found in the vacuole. In plants water flows through the cell wall and cell surface membrane into the vacuole from the outside. This causes the cell wall to ...
Subjects: Science Essays > Biology
Biology Grad Standard
s report we are going to tell you about the life in Troy Ville, and how it relates to the life of a cell. Well the most important thing that's in Troy Ville is probably the City Hall. ... . This acts as the nucleus and chromatin. Around the town there are high mountains which serve as a cell wall. Inside of this we have a fence which protects use from a lot of things that try to distur ...
Subjects: Literature Research Papers
Antibiotics
which antibiotics work.It is possible for enzymes to involve themselves in the manufacturing of the cell wall. If a cell wall fails to develop because the final cross-linking reactions that make the c ... ive and harmless to the bacteria.Some bacteria are resistant because they have conversions in their cell walls that do not allow entry to the antibiotic.3) Write briefly about two different approaches ...
Subjects: Science Essays > Biology
English TTC
OAC BIOLOGY LAB #1 CELL FORM AND FUNCTION LAB HOME/LINKS The design of organisms, organs, tissues, cells and even bioch ... : By conducting this lab it will allow you to study the relationship between form and function at a cellular level. First you will examine the cells outlined in the table below. This table also lists ... t you will examine the cells outlined in the table below. This table also lists the function of the cell and the name of the slide(s) upon which it can be found. Once you have collected this data, you ...
Subjects: Science Essays > Biology
Bacteria
positive and Gram negative bacteria. The gram reaction of a bacterial species has to do with their cell wall structure. Other differences can be observed between the two divisions however. The cell w ... important when dealing with the virulence of the specific microbe. There are two possible types of cell wall that a bacterium may posses depending on its' Gram reaction.Gram negative bacteria have tw ...
Subjects: Science Essays > Biology
Biology Notes
19/25/09•CytoskeletonoMaintains cell shape and provides supportoGives cells mechanisms for movementoSets up tracks for motor protein ... upportoGives cells mechanisms for movementoSets up tracks for motor proteins to carry things in the cello3 types of components:1.Microfilaments (7 nanometers):a.Made of proteins such as actin and myos ... nd myosinb.May exist as a single fiberc.May be in a bundled.May form a large networke.Important for cell contractionsf.Give the plasma membrane its shapeg.Involved with cytoplasmic streamingi.Making t ...
Subjects: Science Essays > Biology
Extraction of DNA from onions
edity was not elucidated for fifty years after that. It occupies a central and critical role in the cell as the genetic information in which all the information required to duplicate and maintain the ... ry procedures. Scientists must be able to isolate the DNA from the other unwanted substances of the cell gently enough so that the DNA is not broken up.For this experiment, an onion was used because o ...
Subjects: Science Essays > Chemistry
biodiversity
Biodiversity and natural resources Chapter 4.1 Plant StructureThe structure of a plant cell - I can compare the ultrastructure of plant cells with that of animal cells:Plant cells have di ... tructure of plant cells with that of animal cells:Plant cells have different organelles from animal cells OrganelleDescriptionFunctionCell WallArigid structure that surrounds plant cells. ... ionCell WallArigid structure that surrounds plant cells. It's made mainly of the carbohydrate celluloseSupports plant cells.Middle lamellaThe outermost layer of the cell.This layer a ...
Subjects: Science Essays > Biology