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Category > Biology Posted 17 Nov 2017 My Price 13.00

B1105 HWK 2_STUD

extremophiles, organisms that thrive in extreme areas such as hydrothermal vents, have some unique requirements for life processes. for example, they use sulfur (S) from the hydrogen sulfide in the environment to capture energy in a similar manner to how humans use oxygen (O).using the periodic table, explain how sulfur could substitude for oxygen in biochemical reactions.

 

I also need help in question 5 all of them

 

BIOL 1105Instructor: Seshan1Student Name: ____________________________Circle One:1:40or3:05Homework 1Due:Tuesday September 19 at 12 pmWSC 2091. You are studying a single-celled organism and want to categorize it further based on cellularcharacteristics. Initial analysis indicates that the cell contains bothDNAandmitochondria.1a. Is this information sufficient to determine whether the organism is a prokaryote or eukaryote?Indicate Yes or No.[2 pts]1b. If yes, indicate what information led you to your conclusion. If no, indicate what additionalinformation you would need to discriminate between the two possibilities.[3 pts]2a. The upward movement of water in a tree depends on water’s chemical properties. Explain how thechemical properties of water can facilitate this movement.[3 pts]2b. Water can rupture plant cells if it freezes (and even boulders for that matter). Explain thisobservation based on your knowledge of the chemical properties of water.[3 pts]2c. Would the observations in 2a and 2b be likely to occur if the oxygen and hydrogen in a watermolecule had the same electronegativity? Explain.[4 pts]3. Imagine that you have discovered a new element in the soil of Mars called Marsantium (Ms). Martianelements have slightly different properties than elements found on Earth –full valence shells have 16
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BIOL 1105Instructor: Seshan2electronsrather than 2 or 8. Ms contains 15 electrons in its valence shell. (Assume that the laws ofphysics still apply on Mars.)3a. Is Ms likely to be reactive (form bonds with other atoms)? Why or why not?[3 pts]3b. You mix Ms together with another Martian element, Alenium (Am). Alenium has a valence shell with1 electron. What type of bond is most likely to form between these two atoms? In your answer, describehow the electrons are shared or gained/lost.[5pts]4. Extremophiles, organisms that thrive in extreme areas such as hydrothermal vents, have some uniquerequirements for life processes. For example, they usesulfur(S) from the hydrogen sulfide in theenvironment to capture energy in a similar manner to how humans useoxygen(O). Using the periodictable, explain how sulfur could substitute for oxygen in biochemical reactions.[5pts]5. A hypothetical element Ec has an atomic number of 156 and an atomic mass of 300.5a. How manyneutronsandelectronswould be found in a neutral Ec atom?[4 pts]5b. If oneprotonwere removed from Ec, would it still be the same element? Why or why not?[5 pts]
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BIOL 1105Instructor: Seshan35c. If oneelectronwere to be gained by an atom of Ec, would it still be the same element? Wouldanything change about the element?[5 pts]6a.Is oxygen gas (O2) a hydrophobic or hydrophilic molecule? Explain your answer.[5 pts]6b. How is oxygen transported in the blood of vertebrates such as human? How is this related to youranswer in 6a?[5 pts]7a. Is the ammonia molecule (NH3) polar or non-polar? Explain your answer based on theelectronegativity of nitrogen and hydrogen atoms.[5 pts]7b. Make a drawing to support your answer in 8a.[5 pts]
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BIOL 1105Instructor: Seshan48. Radioactive elements allow scientists to label and detect specific molecules by measuring theradioactivity. Which radioactive element (C / H / O / N / S / P) may be used to detect ONLY the DNA (butnot carbohydrates, proteins or lipids) in a cell? Explain why you selected this option.[4 pts]9. Drawthree water moleculesforming the hydration shell arounda potassium ion. Label the charge onthe potassium ion and partial charges on the atoms of the water molecules.[8 pts]10. The four main biological molecules (carbohydrates, proteins, nucleic acids and lipids) are all carbon-containing (organic) molecules.10a. Do they all qualify as polymers? Explain.[5 pts]10b. List one property of carbon that allows it to form so many structurally diverse molecules.[3 pts]
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BIOL 1105Instructor: Seshan511. Cholesterol is hydrophobic, and not soluble in water. Yet it’s common to determine blood levels ofcholesterol. What would be one way in which a hydrophobic compound, like cholesterol, can travelthrough aqueous blood even though the compound is not soluble in water?[5 pts]12. If a cell is placed in a cooler environment, the fluidity of the membrane can decrease. Would the cellincrease the amount of saturated or unsaturated fatty acids in the phospholipid bilayer to restore thenormal level of fluidity? Explain your answer.[4 pts]13a. What are two important properties of RNA that may suggest it is one of the first biologicalmolecules (i.e. supporting the “RNA world” hypothesis)?[4 pts]13b. What is the major result demonstrated by Carell and colleagues?[3 pts]Science in the NEWS13. The first case study of the course textbook explores how the firstcell may have arisen given the complexity required for life and limitedchemicals present on early Earth. The origin of life is still very much anactive area of research. Read the followingSciencenews article tolearn about a recent discovery in this field, and answer the questionsbelow.http://www.sciencemag.org/news/2016/05/rna-world-inches-closer-explaining-origins-life
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BIOL 1105Instructor: Seshan613c. Formaic acid or formamide are important for the reactions described by Carell and colleagues.What was a possible source of these chemicals on early Earth?[2 pts]
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BIOL 1105Instructor: Seshan7STUDENTS: PLEASE INCLUDE THIS PAGE FOR CORRECTORSQuestionPoints1a, b/52a, b, c/103a, b/84/55a/45b/55c/56a, b/107a, b/108/49/810a, b/811/512/413a, b, c/9FINAL TOTAL/100
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Status NEW Posted 17 Nov 2017 01:11 AM My Price 13.00

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