Below are oxygen binding curves for myoglobin and hemoglobin.  Blank #1: Which of the curves shows cooperative binding of O2, myoglobin or hemoglobin? Blank #2: Which has a lower P50 value, myoglobin or hemoglobin? Blank #3: What is the approximate P50 value for myoglobin, with units? Blank #4: At high O2 pressures, both myoglobin and hemoglobin have comparable O2 affinities. In the tissues, however, where the oxygen pressure is much lower, hemoglobin has a much _______ (higher/lower) affinity for O2 than myoglobin, allowing it to ______(release/absorb) O2 ______(to/from) myoglobin.  Consider the inhibitors CO and CO2. Blank #5: Myoglobin is inhibited by ______ (CO only, CO2 only, or both CO and CO2) Blank #6: Hemoglobin is inhibited by ______ (CO only, CO2 only, or both CO and CO2)  

Blank #1: The molecule below is a ________ Blank #2: The hydrophobic region of this molecule is an oxidized form of _________ Blank #3: The ionic/hydrophilic region of this molecule is ___________, which has condensed with the molecule in blank #2 Blank #4: Explain how this amphiphilic molecule aids in digestion. Blank #5: In addition to aiding in digestion, hepatic synthesis of this molecule is the major route used by your body to ____________.   

Match the number on each structure with the correct statement. 

Below is a disaccharide. The sugar on the right is allose.  Blank #1: What kind of glycosidic bond is represented here? (for example: beta 1 -> 6) Blank #2: What is the stereochemical relationship between allose and glucose? (enantiomers, epimers at C-? , diastereomers with more than one different chiral C, structural isomers, different molecules)   The disaccharide above condenses with other sugars to give the branched polysaccharide below.  Blank #3: Which is (are) the reducing end(s) of this polysaccharide? (A, B, and/or C) Blank #4: Which is (are) beta 1->6 glycosidic bond(s)? (1, 2, 3, and/or 4) Blank #5: Is this likely to be an energy storage or structural polysaccharide? Explain why. Blank #6: What is the benefit of having branch points? Blank #7: Give two additional examples of branched polysaccharides.

Membrane lipids in tissue samples obtained from different parts of a reindeer’s leg have different fatty acid compositions. (2 pts each, 6 pts) Blank #1: Relative to the membrane lipids from tissues near the upper leg, how are the membrane lipids near the hooves, which are often sunk in snow, different (length and saturation of fatty acids)?  Blank #2: Explain how the length of fatty acids chosen in blank #1 helps the deer maintain the correct level of fluidity in the membranes from cells in the hooves. Blank #3: Explain how the degree of saturation/unsaturation of fatty acids chosen in blank #1 helps the deer maintain the correct level of fluidity in the membranes from cells in the hooves.

The structure of one of the enantiomers of psicose is shown below.  Blank #1: Is this the D or L enantiomer of psicose? Blank #2: Define psicose in terms of the number of carbons and its carbonyl functional group (for example, aldopentose).  Blank #3: What is the stereochemical relationship between psicose and fructose, assuming they are both D? (enantiomers, epimers at C-? , diastereomers with more than one different chiral C, structural isomers, different molecules) Blank #4: Write the letter of the cyclic structure shown below that corresponds to a-D-psicose.  Blank #5: Is this a reducing sugar? (yes/no) Blank #6: Does picose undergo mutarotation? (yes/no)  

Into which group would you place a photosynthetic organism that lacks a nucleus and has a thin peptidoglycan wall surrounded by an outer membrane?

1. Define sterilization. Give an example of a method that can be used for sterilization. (+1 pt).  2. How is a bacteriostatic different from a bacteriocidal? (+1pt).  3. What is the difference between an antiseptic and a disinfectant? (+1pt).   4. What factors should be considered when you are choosing a disinfectant? Name 2. (+2pts) Extra credit opportunity: Give up to 3 additional factors (up to +3pts EC). 

________ are a diverse group of eukaryotic organisms that are similar in rRNA sequences, but quite different from each other in motility types and ecology. They have been used previously as a “catch-all” for organisms that couldn’t be easily classified into other groups.

Table 20.3The following data were obtained from a broth dilution test: Concentration of Antibiotic X Growth 2.0 μg/ml – 1.0 μg/ml – 0.5 μg/ml – 0.25 μg/ml + 0.125 μg/ml + 0 + Bacteria from the 0.25 μg/ml tube were transferred to new growth mediacontaining antibiotic X with the following results: Concentration of Antibiotic X Growth 2.0 μg/ml – 1.0 μg/ml + 0.5 μg/ml + 0.25μg/ml + The data in Table 20.3 show that these bacteria