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My report on "Four Levels of Protein Structure: Day One"
My report on "Four Levels of Protein Structure: Day One"
Student name: Tuan Huynh
Teacher name: null
School: Glen Burnie High School
Submission Time: 10/29/09 10:01 AM
Page 1 : http://mw2.concord.org/public/part2/proteinfolding/page1.cml
1. A protein that can puncture a cell wall:
(a) protein 1
(b) protein 2
(c) protein 3
My answer is (b) (8:58:01 AM)
2. A protein that forms a cable:
(a) protein 1
(b) protein 2
(c) protein 3
My answer is (a) (8:58:07 AM)
3. A protein that becomes a pore in a membrane:
(a) protein 1
(b) protein 2
(c) protein 3
My answer is (c) (8:58:08 AM)
Page 2 : http://mw2.concord.org/public/part2/proteinfolding/page2.cml
1. Put a snapshot of the surface of the protein here.
(8:59:58 AM)
2. Create an image that clearly shows both ends of the string of amino acids. In the snapshot, use the text annotation tool to mark both ends.
(9:03:08 AM)
Page 3 : http://mw2.concord.org/public/part2/proteinfolding/page3.cml
1.
(9:06:30 AM)
2. Use the link above to open and explore the 20 rotatable 3D amino acids. Then select the "Sidechain" color scheme. The atoms that are colored gray are the same in every amino acid. What are they called?
(a) the sidechain atoms
(b) the backbone atoms
(c) the protein atoms
My answer is (b) (9:07:33 AM)
3. On the page of 3D amino acids, find glutamine and histidine. Use the different color schemes to select the true statement(s) below. (More than one statement may be true).
(a) they are both polar amino acids
(b) one is polar and the other is non-polar
(c) one of them is charged
(d) they are both non-polar
My answer is (a) (c) (9:07:38 AM)
Page 4 : http://mw2.concord.org/public/part2/proteinfolding/page4.cml
1. Describe the distribution of electrons and polarity of an O-H bond.
In the O-H bond, Oxygen is more electronegative than Hydrogen; thus, Oxygen attracts more electrons from Hydrogen than Hydrogen do from Oxygen. This unequal distribution of electrons made the bond polar. (9:22:00 AM)
2. Describe the distribution of electrons and polarity of a C-H bond.
In the C-H bond, Carbon and Hydrogen have approximately equivalent electronegativity; thus they have a small unequality in electrons distribution. This near-equal sharing of electrons made the bond nonpolar. (9:27:33 AM)
Page 5 : http://mw2.concord.org/public/part2/proteinfolding/page5.cml
1. Snapshot of asparagine:
polar (9:37:59 AM)
2. Snapshot of leucine:
nonpolar (9:38:25 AM)
3. Snapshot of threonine:
polar (9:39:32 AM)
4. For Asparagine, which surface shows the correct charges?
(a) surface 1
(b) surface 2
My answer is (a) (9:41:53 AM)
5. Which surface shows the correct charges for Leucine?
(a) surface 3
(b) surface 4
My answer is (b) (9:42:18 AM)
6. Which surface shows the correct charges for Threonine?
(a) surface 5
(b) surface 6
My answer is (a) (9:43:05 AM)
7. Choose the best way to complete this sentence: When two atoms in a bond have very different electronegativities, the surface of the molecule...
(a) has no charge.
(b) has regions of positive and negative charge.
(c) has a negative charge.
(d) has a positive charge.
My answer is (b) (9:43:26 AM)
8. Explain how the colors on the surfaces of the side chains indicate whether it is polar or non-polar.
When a molecule is polar, the charges are positive and negative; and thus there is different in colors on the surface. When a molecule is nonpolar, the color distribution of charges is similar or the same. (9:46:50 AM)
Page 6 : http://mw2.concord.org/public/part2/proteinfolding/page6.cml
1. Is water a polar or non-polar molecule? Explain your answer by writing about the bonds in water.
Water is a polar molecule, because Oxygen attract more Hydrogen electrons and Hydrogen attract less Oxygen electrons, making the molecule positive charge at one end(Hydrogen) and negative charge on the other end(Oxygen). This is the unequal distribution of electrons between atoms. (9:51:35 AM)
2. Which type of amino acid is hydrophobic?
(a) polar
(b) non-polar
(c) neither - they both don't attract water very well
(d) neither - they attract the water molecules equally
My answer is (b) (9:53:08 AM)
3. Use your knowledge of positive and negative charge to explain why polar molecules attract each other and water better than non-polar molecules.
Polar molecules have the strong opposite charges in both ends. When they encounter each other, the positive end of one molecule will attract the nagative end of the other molecule; and vice versa, water is polar so it also attracts other polar molecules. Thus this attraction make them "stick" together. In nonpolar molecule, charges are lack in both end since it is neutral. Thus, it can not make any attraction to the polar molecules. (9:59:05 AM)
4. Which solvent(s) leads to folding of the protein?
(a) both water and oil
(b) neither water nor oil
(c) water
(d) oil
My answer is (c) (10:00:25 AM)
5. Where do the amino acids with polar side chains end up when the protein chain folds?
(a) evenly throughout the folded protein
(b) mostly inside the folded protein
(c) mostly on the outside of the folded protein
My answer is (c) (10:01:03 AM)
Page 7 : http://mw2.concord.org/public/part2/proteinfolding/page7.cml
Page 8 : http://mw2.concord.org/public/part2/proteinfolding/page8.cml
Page 9 : http://mw2.concord.org/public/part2/proteinfolding/page9.cml
Page 10 : http://mw2.concord.org/public/part2/proteinfolding/page10.cml
Page 11 : http://mw2.concord.org/public/part2/proteinfolding/page11.cml
Page 12 : http://mw2.concord.org/public/part2/proteinfolding/page12.cml
Page 13 : http://mw2.concord.org/public/part2/proteinfolding/page13.cml
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