Homework Answers
3. Oxygen can be toxic to the cell as prolonged or exposure to too much of oxygen reacts with the cells on the molecular level. The oxygen molecule lose an electron from their orbit forming a free radical. These free radicals are highly reactive and toxic in nature , they have deleterious effects like making the cell unstable, destroying the cell organelles, denaturing the DNA and the proteins that ultimately lead to Cell Dealth.
4. Aerobic organisms (organisms that need oxygen for survival) have specialised enzyme systems like enzyme catalase that are capable pf detoxification of the oxygen, while some live in anerobic micorhabitats to escape oxidative stress.
5.Thioglycolate tubes are multipurpose, enriched, differential medium used primarily to determine the oxygen requirements of microorganisms. Sodium thioglycolate allows the growth of all the oligate anerobes by consuming all the oxygen in the medium, an indicator named Resazurin is added which is pink when oxidized and colorless with reduced .The appearance of pink band indicates presence of oxygen in the tube, if at top it indicates presence of oxygen only at the top of the tube
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e the 3 Why is oxygen toxic to cells? nemaslupanov s 4 How do some cells...
Share your thoughts about why is amyloid toxic to cells and how does it contribute to...
Share your thoughts about why is amyloid toxic to cells and how does it contribute to neurodegenerative disorders, such as Alzheimer's disease. (Cite any sources used, minimum 8 sentences)
than other labs. These are toxicity, volatility, and flammability. We routinely use toxic organic solvents like...
than other labs. These are toxicity, volatility, and flammability. We routinely use toxic organic solvents like methanol and acetone that are volatile (have low boiling points), but even solid organic materials can produce vapors that may be toxic. Furthermore, organic materials are flammable, and solvent vapors in the air can and do produce explosive mixtures. You should take some general precautions when doing organic chemistry: Do not get solutions on your skin. You do not need to always wear gloves...
Osmosis 5. Did water flow into or out of the plant cells (potato cells) in each of the samples examined? How do...
Osmosis 5. Did water flow into or out of the plant cells (potato cells) in each of the samples examined? How do you know this? 6. Would this experiment work with other plant cells? What about with animal cells? Why or why not? 7. From what you know of tonicity, what can you say about the plant cells and the solutions in the test tubes? What do your results show about the concentration of the cytoplasm in the potato cells...
GOING FURTHER 1. Based on the investigation, why do you think heat and alcohols are used...
GOING FURTHER 1. Based on the investigation, why do you think heat and alcohols are used to disinfecet medical equipment? 2. Sometimes when people accidentally ingest heavy metal ion like mercury they are asked to drink some milk. Why do you think this is? 3. How does a change in pH affect the secondary and tertiary structures of a protein? 4. Calculate the % Casein in your milk sample. (Show work) Suppose you filled one test tube with alanine and...
A fuel cell is an electrochemical device that reacts hydrogen with oxygen from the air to...
A fuel cell is an electrochemical device that reacts hydrogen with oxygen from the air to produce water and DC electricity. A proposed application is replacement of the gasoline-fueled internal combustion engine in an automobile with a 100 kW fuel cell. You are on a summer internship with a gas supplier planning to transport hydrogen to service stations for the use in cars powered by fuel cells. The hydrogen is to be transported in tube trailers, each of which has...
How thick is the epidermis, in number of cells? Its thickness is not uniform so give...
How thick is the epidermis, in number of cells? Its thickness is not uniform so give a range from minimum to maximum. 12. What kind of epithelial cells does the epidermis contain? 13. What is different about the cells that make up the outermost layer of the skin when compared to these epidermal cells? 14. Compare the structure of the dermis to the epidermis. What structures are found in the dermis? 15. What is the structure of the hypodermis like...
how do you do this ? Some Calculations You started out with a known amount of...
how do you do this ?
Some Calculations You started out with a known amount of harium chloride and sodium sulfate. How much solid product should you collect? Show your calculations. How much did you collect? What is your percent yield? Which reactant should be the limiting reagent? Which reactant should be the excess reagent? Proving the identity of the Limiting and Excess Reagents There are two scenarios for the identity of the contents of the beaker containing the filtrate....
PART A- Observe Normal Catalase Reaction To determine the volume of oxygen released in ml) during...
PART A- Observe Normal Catalase Reaction To determine the volume of oxygen released in ml) during the degradation of H202 by catalase, you will first do trials using the set-up in Fig. 1. 1. Place 10 ml of the 3% hydrogen peroxide solution into a clean bottle 2. Add quickly catalase containing solution. 3. What gas is being released? 4. Throughout this investigation you will estimate the rate of the reaction (by measuring the volume of water displaced by O2...
Trends Review and Applications Name Period 1.) Calculate the Z-n of the elements fluorine and chlorine. Why do you...
Trends Review and Applications Name Period 1.) Calculate the Z-n of the elements fluorine and chlorine. Why do you notice about each of the elements 2? Why does this make sense in terms of their electron configuratioms 2.) Explain with as much detail possible why it requires more energy to remove the first valence electron from oxygen than from carbon. 3.) Explain with as much detail possible why it requires more energy to remove the first valence electron from magnesium...
1. Assessing accuracy and proficiency: Do you get the same result if you measure the same...
1. Assessing accuracy and proficiency: Do you get the same result if you measure the same dilution tube twice? What are some reasons you might not get the same measurement? 2. Does this OD reading tell you how many live cells are in culture? What advantages are there to measuring cells with the s What disadvantages? 3. How confident are you that you accurately identified the concentration of pigment? List three caveats to your conclusion about the concentration of pigment...
than other labs. These are toxicity, volatility, and flammability. We routinely use toxic organic solvents like methanol and acetone that are volatile (have low boiling points), but even solid organic materials can produce vapors that may be toxic. Furthermore, organic materials are flammable, and solvent vapors in the air can and do produce explosive mixtures. You should take some general precautions when doing organic chemistry: Do not get solutions on your skin. You do not need to always wear gloves...
Osmosis 5. Did water flow into or out of the plant cells (potato cells) in each of the samples examined? How do you know this? 6. Would this experiment work with other plant cells? What about with animal cells? Why or why not? 7. From what you know of tonicity, what can you say about the plant cells and the solutions in the test tubes? What do your results show about the concentration of the cytoplasm in the potato cells...
GOING FURTHER 1. Based on the investigation, why do you think heat and alcohols are used to disinfecet medical equipment? 2. Sometimes when people accidentally ingest heavy metal ion like mercury they are asked to drink some milk. Why do you think this is? 3. How does a change in pH affect the secondary and tertiary structures of a protein? 4. Calculate the % Casein in your milk sample. (Show work) Suppose you filled one test tube with alanine and...
how do you do this ?
Some Calculations You started out with a known amount of harium chloride and sodium sulfate. How much solid product should you collect? Show your calculations. How much did you collect? What is your percent yield? Which reactant should be the limiting reagent? Which reactant should be the excess reagent? Proving the identity of the Limiting and Excess Reagents There are two scenarios for the identity of the contents of the beaker containing the filtrate....
PART A- Observe Normal Catalase Reaction To determine the volume of oxygen released in ml) during the degradation of H202 by catalase, you will first do trials using the set-up in Fig. 1. 1. Place 10 ml of the 3% hydrogen peroxide solution into a clean bottle 2. Add quickly catalase containing solution. 3. What gas is being released? 4. Throughout this investigation you will estimate the rate of the reaction (by measuring the volume of water displaced by O2...
Trends Review and Applications Name Period 1.) Calculate the Z-n of the elements fluorine and chlorine. Why do you notice about each of the elements 2? Why does this make sense in terms of their electron configuratioms 2.) Explain with as much detail possible why it requires more energy to remove the first valence electron from oxygen than from carbon. 3.) Explain with as much detail possible why it requires more energy to remove the first valence electron from magnesium...
1. Assessing accuracy and proficiency: Do you get the same result if you measure the same dilution tube twice? What are some reasons you might not get the same measurement? 2. Does this OD reading tell you how many live cells are in culture? What advantages are there to measuring cells with the s What disadvantages? 3. How confident are you that you accurately identified the concentration of pigment? List three caveats to your conclusion about the concentration of pigment...
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