Cells and Movement of Substances All living things are formed by cells‚ the structure of these cells varying depending on their function. Animal and plant cells have common features such as a nucleus‚ cytoplasm and cell membrane. Dissolved substances pass into and out of cells by diffusion Diffusion Diffusion definition: Diffusion is the movement of molecules from a high concentration to a low concentration. Dissolved
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are different types of cells inside the human body. They are the epithelial cells‚ muscle cells‚ nerve cells‚ bone cells and muscle cells. Epithelial cells are eukaryotic cells. Eukaryotic cells have a distinct nucleus and possess membrane-bounded organelles. They differ from prokaryotic cells‚ such as bacteria. The function of epithelial cells is to absorb and secrete. Epithelial cells have a nucleus which acts as the control centre of the cell through the production of mRNA and hence protein synthesis
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thousands of years‚ but still share characteristic with bacteria such as: their genome is a circular molecule ‚ have little non-coding DNA‚ and have their genes tightly packed with few intergenic regions between genes. Furthermore‚ mitochondria are organelles that contain a separate set of DNA from the rest of the cell and the body. Mitochondrion DNA contains 16‚569 nucleotides and contains 37 genes. These genes are all involved in the production of energy and storage of ATP. The point of this lab is
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Use available evidence to assess the impact of technology‚ including the development of the microscope on the development of cell theory. Over a period of nearly 400 years‚ technology has impacted so significantly on humanities understanding of life. This is due to the development of the microscope‚ examining the invisible‚ discovering the building blocks of life‚ and the creation of the cell theory. This theory is so fundamental to our current knowledge of the functioning of living organisms.
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into the cell. The cell will gain water and grow larger. In plant cells‚ the central vacuoles will fill and the plant becomes stiff and rigid‚ the cell wall keeps the plant from bursting In animal cells‚ the cell may be in danger of bursting‚ organelles called CONTRACTILE VACUOLES will pump water out of the cell to prevent this. HYPERTONIC SOLUTIONS The word "HYPER" means more‚ in this case there are more solute (salt) molecules outside the cell‚ which causes the water to be sucked in that
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Assignment front sheet Learner name Assessor Name Science team - Date issued Completion date Submitted on Qualification Unit number and title BTEC Extended Diploma in Applied Science (Medical Science) 1: Fundamentals of Science Assignment title Initial assignment covering Unit 1 Fundamentals. In this assessment you will have opportunities to provide evidence against the following criteria. Criteria reference To achieve the criteria the evidence must show that the
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inflammatory response (caused by cells that exploded/necrosis).. ect. Necrosis is triggered by something unplanned‚ leading to decrease ATP‚ pumps‚ atpase activity‚ membrane becomes permeable = lysis‚ Caused by trauma or cytotoxicity. Now all of these organelles and enzymes ect are in the neighboring cells which cause problems to healthy cells. By apoptosis you can get rid of cell without impact on neighbouring
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Passive Transport (Section 5-1) Answer Sheet VOCABULARY REVIEW Explain the relationship between the terms in each of the following pairs of terms. 1. concentration gradient‚ diffusion: A difference in the concentration of molecules in two areas‚ called a concentration gradient‚ can result in diffusion‚ the movement of molecules from the area of higher concentration to the area of lower concentration. 2. osmosis‚ turgor pressure: Osmosis is the diffusion of water molecules across a cell membrane
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Discussion: Osmosis is a passive process by which water molecules move through a partially permeable membrane from a region of high concentration to a region of low concentration‚ creating an equal amount of molecules from both regions on each side of the membrane. This process is the result of a downhill energy system known as water potential. Water potential is the potential energy of water (per unit volume) that allows it to move from one area to another by osmosis. This system causes the water
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vacuole and they use starch for storage whereas an animal cell has lysosomes‚ rough ER‚ smooth ER and ribosomes. Eukaryotes differ from prokaryotes because prokaryotes have no nucleus‚ they just have a loop of DNA and they also have no membrane-bound organelles. Prokaryotes also have a cell wall‚ along with a slime capsule‚ flagellae and plasmids. Another way of which living organisms differ from each other is through proteins. Proteins are made up of amino acids and they condense together to form a dipeptide
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