Peter Agre’s Discovery Figure Page Figure 1: Figure 2: Upon deciding a topic for an ideal Nobel laureate‚ I had to meet two criteria I decided for myself. Aside from the topic having to be science related‚ I decided that the laureate could not be well know‚ such as Watson or Einstein‚ and also it should be a science topic that I have found the most intriguing since entering college which happens to be the human body. Even with such a broad topic as the human body I came across a laureate
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The cell is the basic functioning unit of organisms in which chemical reactions take 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 are two main classes of cells- Prokaryotes which are cells without a nucleus‚ where the DNA is spread around the cytoplasm of the cell‚ an example of a prokaryote is a bacterium (See Figure 1). The other class is the Eukaryotes
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P1 [pic] Cell membrane - encloses the contents of the cell and regulates the flow of substances into and out of the cell. Mitochondrion - this feature produces a substance called adenosine triphosphate (ATP) which is the carrier of energy in all cells. Centriole - these two features made of hollow tubules play a key role in cell division. Ribosomes - these small‚ granular features of the cell play a key role in the assembly of proteins. Chromosome - During cell division‚ DNA‚ the
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the glycocalyx of a cell that is becoming cancerous. In fact‚ a cancer cell’s glycocalyx may change almost continuously‚ allowing it to keep ahead of immune system recognition mechanisms and avoid destruction. (Cancer is discussed on pp. 145-146) 3.2 Selective permeability is a characteristics of healthy‚ intact cells. When a cell (or its plasma membrane) is severely damaged‚ the membrane becomes permeable to virtually everything‚ and substances flow into and out of the cell freely. This phenomenon
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why increasing extracellular K+ causes the membrane potential to change to a less negative value. How well did the results compare with your prediction? Your answer: If extracellular K+ is increased then the intracellular K+ will decrease. Fewer intracellular K+ ions would result in the membrane potential being less negative. This is what I predicted to happen. 3. Explain why a change in extracellular Na+ did not significantly alter the membrane potential in the resting neuron? Your answer:
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Prokaryotic and Eukaryotic Cells‚ Distinguish Among Plant‚ Animal‚ and Protist Cells‚ and Identifying the Organelles that are Evident in Them Introduction There are two different types of cells‚ prokaryotes and eukaryotes. Prokaryotes‚ such as bacteria‚ lack a nuclear membrane and other membrane bound organelles. Their genetic material consists of a single molecule of singular DNA. Eukaryotes‚ such as plant and animal cells‚ have a nuclear membrane and other membrane bound organelles. Their genetic
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ascomycetes‚ which are considered delicacies. 06. What is the role-played by luteinizing hormones in males and females respectively? 07. Observe the diagram and answer the following; a. Are these types of guard cells found in monocots or dicots? b. Which structure of guard cells plays an important role in the opening and closing of stomata? 08. In which gymnosperm plants will you look for mycorrhiza and corolloid roots? Section - B 09. The leucoplasts are colourless plastids of varied
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water intake than in a normal‚ healthy adult under age 40? 3. Why does potassium concentration rise in patients with acidosis? What is this called? What effects does it have? 4. Saline solution is used to reverse hypotonic hydration. Are body cell membranes permeable to saline? Explain your response. 5. Explain the renin-angiotensin mechanism. 6. Explain how ADH compensates for blood that contains too many solutes. Answers 1. Three types of homeostasis are involved: fluid balance‚ electrolyte
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The effect temperature has on the cell membrane is that at low temperatures‚ the cell membrane becomes turgid (stiff‚ harder) in order to ’adapt’ to it’s new environment‚ making it harder for substances to pass/diffuse through it‚ at higher temperatures‚ the cell is softer‚ and more fluid like and when the temperature is too hot for the cell to handle‚ it breaks up or ’melts’‚ releasing what was inside of the cell. This is shown by the results in the graph by the lower temperature
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What is the function of each component of the model? What determines the flexibility of the cell membrane? 14. What are the types of transport across the cell membrane? Which uses proteins? Which needs energy? 15. For end product feedback‚ the product stops enzyme activity. Explain the two ways enzymes are inhibited by product. 16. What is the resting membrane potential range of cells 17. Describe the model that describes how an enzyme fits a substrate. Which is the “key” and
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