1 Diffusion is the movement of molecules (or ions) from a high concentration to low concentration. Diffusion is form of passive transport as energy does not need to be generated. Diffusion is complete when the concentration of molecules is equal on either side of the membrane. Diffusion rate can be influenced by many factors such as: Concentration gradient across the the membrane. Permeability of the membrane to the diffusing substance. Temperature. Surface area of the membrane. Question 2 2.1
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Experiment 1 Background Diffusion is a process‚ in relation to the spontaneous movement of molecules from an area of high concentration‚ to an area of low concentration down a concentration gradient. It is a type of passive transport method‚ that requires no cellular energy (ATP). This movement occurs‚ until a state of equilibrium has been established on both sides of the membrane. The diffusion of molecules happens at cellular level‚ through a cell membrane via the pores. The cell membrane
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therefore‚ it would take longer for a person to decide to call for help and the longer span of time taken can lead worse injuries and even the death of those involved in the accident. An experimental research study that would help test whether diffusion of responsibility is present
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Diffusion in Cells Isabel Zak Question: How does the size of a cell affect the distribution of chemicals throughout the cell? Hypothesis: The larger the cell is‚ the more difficult it will be for the chemicals to reach the centre of the cell‚ and diffuse throughout it. This is because there will be a higher surface-area to volume ratio in the larger cells‚ making the centre of the cells further away from the surface. Therefore‚ when dipped in sodium hydroxide‚ the larger cells will not
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Effects of Temperature and pH on Catalase Activity INTRODUCTION Enzymes are organic catalysts that spur metabolic reactions. The presence of an enzyme within a cell is essential in order for any sort of reaction to take place. All enzymes are complex proteins that act in an organism’s closely controlled internal environment. In such a homeostatic environment‚ the temperature and the pH (concentration of hydrogen ions)‚ remain within a fairly narrow range. Extreme variations in pH and temperature
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Tara J. Williams Instructor: Donna Thompson Date: October 20‚ 2013 Television (The effect it has on children) Television has been around for approximately 75 years‚ according to Erin Monaghan. It has cause some negative impact on our young‚ youth of today. Children spend more time watching television than they spend on homework and family time. Too much TV time has cause children to be obesity‚ not able to make rational decisions in violent solutions and having sex at an such
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The Effects the Media has on Teenagers James Morrison‚ an entertainer‚ states that “whoever controls the media‚ controls the brain.” Within this quote‚ Morrison implies that the media has an effect on the human brain and can affect it tremendously. The media has effects on teenagers‚ both positive and negative. The media is a vast forum of communication that permeates nearly every aspect of culture (Mokeyane). It consists of a broad spectrum of communication such as: television‚ films‚ web sites
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Good morning teachers and peers‚ today I’m going to discuss conflict‚ the affects it has on people with examples from two texts. | What is conflict? Conflict is another word for fighting‚ battling‚ or struggle. Conflict can be expressed in many ways‚ such as; war‚ hate‚ aggression‚ bullying‚ and competiveness. Conflict has negative effects on people. Conflict can result in death‚ mental illness‚ suicide‚ and destruction. Conflict is cause by many reasons including differences in values‚ desires
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Cause and Effect Essay English 121 February 12‚ 2012 The Effects that Deployment has on Families Whether good or bad‚ we all experience stress at some point in our lives. Stress is our body’s normal reaction to a physical or emotional adjustment. Because of the daily contacts we encounter with stress‚ we all have an idea of what it is and how it affects us‚ physically and mentally. Military families often deal with extra stress from the result of a loved one’s deployment. Families face
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of alertness (a CNS effect) but also a higher heart rate‚ blood pressure and respiratory rate. Caffeine also acts as a stimulant drug‚ causing increased amounts of stimulatory neurotransmitters to be released. At high levels of consumption caffeine has been linked to restlessness‚ insomnia and anxiety‚ causing raised stress and blood pressure. This can lead to heart and circulation problems. Hypothesis: Daphnia subjected to a caffeine solution will show a rise in heart rate as caffeine is a stimulant
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