Cell membranes

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10/1/13 10:29 AMBIO156 - Lab 4 Page 1 of 11https://www.riolearn.org/content/bio/BIO156/BIO156_INTER_0000_v…b04.shtml?encrypted-sectionid=Z0RiRVE3bkZMRnd4WmZJc2doQjNnZz09 Lab 4 Cell Structure, Osmosis, and Diffusion Introduction: Connecting Your Learning The basic building block of life is the cell. Each cell contains several structures, some of which are common to both eukaryotic and prokaryotic cells and some that are unique to specific cell types. This lab will discuss cell structures and how materials are moved in and out of the cell. Specifically, the principles of diffusion and osmosis will be demonstrated by performing a scientific investigation that studies the effect of salt concentration on potato cells. Focusing Your Learning Background Information In 1662, Robert Hooke investigated the properties of cork when he discovered cells. He named them after small rooms in a monastery because they reminded him of them. Years later, in 1837, Schleiden and Schwann were attributed with developing the cell theory. While their original theory was modified, the fundamental ideas be- hind the theory held true. Three general postulates are included in the cell theory: 1) All organisms are composed of cells. 2) The cell is the unit of life. 3) All cells arise from pre-existing cells. Because a cell is the basic building block of living things, it is important to become familiar with its characteristics. Several structures comprise a cell. Many of these structures are visible with the use of a standard compound microscope. Below are pictures of idealized plant and animal cells, illustrating the important structures. The cell membrane encloses all cells and is responsible for separating the internal en- vironment from the extracellular space (the space between cells). Because other structures within the cell are also surrounded by a membrane, the outer membrane is often called the plasma membrane. 10/1/13 10:29 AMBIO156 - Lab 4 Page 2 of 11https://www.riolearn.org/content/bio/BIO156/BIO156_INTER_0000_v…b04.shtml?encrypted-sectionid=Z0RiRVE3bkZMRnd4WmZJc2doQjNnZz09 The cell membrane is semi-permeable, allowing cer- tain molecules to enter into the cell freely, while others are prohibited from entering the cell. It is composed of phospholipids, which have a head consist- ing of a phosphate group and a tail of two fatty acid chains. The phosphate group is attracted to water (hydrophilic) while the fatty acid chains are repulsed by water (hydrophobic). When in water, the properties of the phospholipids cause them to form two layers: The hydrophobic tails face the inside of the double layer (away from the water), and the hydrophilic heads face out (toward the water). Because two layers are formed, the membrane is made up of a phospholipid bilayer, as seen in the image. The cell wall surrounds the cell membrane in plant cells, bacteria, and some fungi. In plant cells, the cell wall is composed of cellulose. In bacteria, the wal.

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ecplain the cell and its functions Solution Cell The cell is the basic structural, functional, and biological unit of all known living organisms. A cell is the smallest working unit of all living organisms on our planet earth, which is capable of performing life functioning. They are often called the building blocks of our life. The study of cells is called cell biology. The term cell was first observed and identified by an English physicist Robert Hook in the year 1665. There were many theories developed for cell. Later in the year 1839 a two German scientists Schwann and Schleiden provided few basic principles of cell. Cell consists of cytoplasm enclosed within a membrane which contains many biomolecules such as proteins and nucleic acids. The organisms can be classified as unicellular (consists single cell: bacteria-prokaryotes) or multicellular (including plants and animals-Eukaryotes). The number of cells in plants and animals varies from species to species. Therefore human contains more than 10 trillion cells. There are many cells in an individual, which performs several functions throughout the life. The size and the shape of the cell range from millimeter to microns, which are generally based on the type of function that it performs. A cell generally varies in their shapes. A few cells are in spherical, rod, flat, concave, curved, rectangular and oval shaped. Most of the plant and animal cells are visible only under microscope, with dimensions between 1 and 100 micrometers. The structure and function of cells The basic structure of all cells, whether prokaryotes and eukaryotes are the same. All cells have an outer layer called plasma membrane. The plasma membrane holds the cell together and allows the passage of substances in and out of the cell. The interior of both kinds of cells is known as cytoplasm. Within the cytoplasm eukaryotes are embedded with cellular organelles but in prokaryotes contain no organelles. Finally, both types of cells contain small structures called ribosomes. These are the sites within the cells where proteins are produced. Cell wall: It helps protecting the plasma membrane and plays an important role in protecting the cells. Cell membrane: A thin, flexible layer of plant or animal tissue that covers, lines, separates or holds together, or connects parts of an organism Cytoplasm: It is a membrane which protects the cell by keeping cells organelles separates from each other. This helps to keep the cell in stable. Cytoplasm is the major site that many biochemical reactions take place. Nucleus: They are membrane bound organelles which are found in many eukaryotes. It is the very important organelle of a cell as it controls the complete activity of a cell and also plays a vital role in reproduction Nuclear membrane: These bilayer membranes which protects the nucleus by surrounding around it and acts as a barrier between the barrier nucleus and other organelles in the cell Nucleolus: It is found inside the nucleus.

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