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UT - IB 311 - BIO 311C Study Guide 1 based on Concept Checks - Study

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UT - IB 311 - BIO 311C Study Guide 1 based on Concept Checks - Study

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background image Study Guide 1 based on Concept Checks Concept Check 2.3 1. Why does H­C=C­H fail chemically? C needs 8 e­ in valence shell so missing 2 e­ per C 2. What holds atoms together in  MgCl 2 ? Ionic bonds 3. Why would you want to learn the 3D shapes of naturally occurring signal  molecules? Clue to receptor shapes; synthesize molecules that mimic the shapes to treat 
individuals who can’t produce their own
Concept Check 3.1 1. What is electronegativity; how does it affect interactions between water  molecules? Electronegativity= how much an e­ is attracted to the e­ of a covalent bond.  Electronegativity affects interactions in water molecules by causing a polar 
molecule that forms hydrogen bonds. 
2. Why is this unlikely?        H     H     / \ O O            \             / H      H Because H is partially (­) so H’s will repel and be attracted to the O’s forming 
hydrogen bonds between molecules.
3. What would the effect on properties of the water if O and H had equal  electronegativity? Hydrogen bonds could not form if the molecule was non­polar.  Concept Check 3.2 1. Describe how properties of water affect upward movement of water in trees. Cohesion of water molecules cause water to stick to itself and adhesion of  water causes water to slowly crawl up the interior side of the tree 2. Explain “It’s not the heat; it’s the humidity.” Humidity has water and water can absorb heat 3. How can freezing water crack boulders? Solid water is denser b/c hydrogen bonds cause water molecules to spread out  4. What is the benefit of water striders’ hydrophobic substance coated legs?  What if the substance was hydrophilic? The substance allows the insect to walk on surface w/ water molecules b/c the  non­polar substance repels water; the insect would not be able to walk b/c the 
substance would interact w/ water and pull the legs and the insect in water
5. Concentration of ghrelin is 1.3 x 10^­10M. How many molecules of ghrelin  are in 1 L of blood? 1.3 x 10^­10  Concept Check 4.2
background image 4. Can propane ( C 3 H 8 ) form isomers?  No, because there is only way to form the molecule. There are no double  bonds and the hydrogen­carbon bonds make the molecule symmetrical.  Concept Check 5.1 1. What are the four main classes of molecules? Which class does not have  polymers? Carbohydrates, Lipids, Proteins, Nucleic Acids. Lipids 2. How many molecules of water are needed to hydrolyze a polymer of ten  monomers? 9 3. If you eat fish, what must occur for the amino acid monomers to be converted  to new proteins? Released by hydrolysis and condensation reaction to synthesize new 
polypeptide chains
Concept Check 5.2 1. Write the formula for a monosaccharide that has 3 carbons. C 3 H 8 2. Two glucose molecules synthesize to make maltose. Glucose is  C 6 H 12 O 6 What is maltose? C 3 H 22 O 11 Concept Check 5.3 1. Compare the structure of a fat with a phospholipid. Fat= a glycerol with three fatty acids (hydrocarbon chain); non­polar; 
hydrophobic
Phospholipid= glycerol attached to fatty acids; polar head, non­polar tail; 
hydrophobic and hydrophilic; phosphate group
2. Why are human sex hormones lipids? Hormones are steroids which are hydrophobic lipids Concept Check 5.4 1. What parts of a polypeptide participates in bonds that hold secondary  structure? Tertiary structure? Secondary = hydrogen bonds Tertiary = interaction of side chain 3. Where would you expect a polypeptide region rich in amino acids valine,  leucine, and isoleucine to be located in a folded polypeptide? Explain. Nonpolar and hydrophobic so it is protected from the polar inside of the cell.  End of Chapter 25 Qs 1. Fossilized stromatolites A. formed around deep­sea vents B. resemble structures formed by bacterial communities that are found  today in some shallow marine bays C. provide evidence that plants moved onto land in the company of fungi  around 500 million years

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School: University of Texas at Austin
Department: Biology
Course: Introductory Biology II
Professor: Mark Bierner
Term: Winter 2016
Tags: Biology, Introduction, Studyguide, Exam 1, Concept, and checks
Name: BIO 311C Study Guide 1 based on Concept Checks
Description: These notes focus on specific concept checks outlined by the professor in preparation for Exam 1. The questions are courtesy of Campbell Biology 10th Edition. I did not create the questions.
Uploaded: 09/19/2016
4 Pages 21 Views 16 Unlocks
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